letus35 extreme

8/20/2019 Letus35 Extreme

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A Word of Welcome

Thank you and congratulations on your purchase of the Letus35 Extreme! This

manual covers the basic installation and operation of your 35mm adapter

along with additional information on Troubleshooting and Technical Support.

35mm Lens(user provided)

Front Tube

CondenserLens

PrismCasing

InterchangeableLens Mount

Ground Glass (GG)& GG Holder

AchromatLens

InterchangebleConnection Ring

Getting to Know the Letus35 Extreme

Below is an image of the different components of the Letus35 Extreme for

reference throughout this user guide.


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Letus35 Extreme User Guide1

TABLE OF CONTENTS

Understanding The Letus35 ExtremeI. . . . . . . . . . . . . . 2

Package Contents: A. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

Optional Accessories:B. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

Main Features:C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

Installation and SetupII. . . . . . . . . . . . . . . . . . . . . . . . . . . 3

Unpacking: A. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

Connecting The Letus35 Extreme To The Camera:B. . . . . . 3

Aligning The Adapter:C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

Focusing The Camera Lens To The Ground Glass:D. . . . . . . 4

Attaching The Lens Mount And Lens :E. . . . . . . . . . . . . . . . . . 5

Powering Up The Letus35 Extreme:F. . . . . . . . . . . . . . . . . . . . 5

Happy Shooting:G. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Changing The Lens Mounts:III. . . . . . . . . . . . . . . . . . . . . 5

Measuring Focus:IV. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Adjusting Back Focus:V. . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Testing The Focus: A. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Adjusting The Focus:B. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Cleaning The System:VI. . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Trouble Shooting And Technical Support:VII. . . . . . . 10

Warranty:VIII. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10NotesIX. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12


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Understanding The Letus35 ExtremeI.

This section provides information about the Letus35 Extreme, package con-

tents, optional accessories and its main features.

Package Contents: A.

Letus35 Extreme 35mm DOF Adapter»

Lens caps for the Extreme (one for each side»

of the adapter)

Lens mount (which you specified with your»

order)

Your choice of a connection ring (72mm,»

77mm or 82mm). You also can upgrade tothe camera specific optimization kits (e.g.

Sony EX1 kit, Panasonic HVX-200 kit, etc.)

Allen wrench»

Optional Accessories:B.

Support Bracket»

Rod Support System (this system includes the support bracket)»

Rod Extensions»Custom case»

Additional lens mounts for different types of lenses. We offer:»Canon FD Mount »M42 Screw Mount »Nikon Locking Mount »Canon EF/EOS Locking Mount »Minolta MD Locking Mount »

Zeiss Contax (C/Y) Mount »Leica-R Mount »

Pentax-K Mount »Olympus OM Mount »PL Mount »

OCT19 Mount »

Camera specific optimization kits (e.g. Sony EX1 kit, Panasonic HVX-200»

kit, etc.)

Specialized Connection Rings (specifically made for certain cameras)»

For the current list of accessories, please visit our website:»

www.letus35.com

Main Features:C.

A half (1/2) Stop of Light Loss»


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IOC Prism System to correct the image so it is right side up»

Virtually Quiet: The Vibrating Ground Glass emits nearly no operational»

noise.

Highest Optical Grade Achromatic lens custom-made for the Letus35»

Extreme 35mm DOF Adapter.

Custom Condenser specially tailored for the Letus35 Extreme 35mm»

DOF Adapter optimizing Image Quality.

New and improved Ground Glass Design: Beautiful Film-Like Bokeh, ac-»

curate color reproduction, absolutely no vignetting and the best Edge-

to-Edge Sharpness in the industry.

A sleek On/Off indicator with LED.»

Easy alignment»

Fully Enclosed batteries secured by tough magnets for ease of replace-»

ment in the field.Extreme Durability, Professional Look: Casing milled from Solid Alumi-»

num and finished in black.

Installation and SetupII.

Unpacking: A.

Remove the aluminum rear cap.1.

Remove the plastic front cap.2.

Connecting The Letus35 Extreme ToB.The Camera:

Using the Allen Wrench Tool included with1.

your package, loosen the three (3) screws

located on the Back of the Letus35 Extreme

35mm DOF Adapter and carefully remove

the Camera Connection Ring.

Hand tighten the connection ring onto the2.

camera filter thread (Caution: Do NOT over

tighten the ring to the camera threads as

doing so may cause damage to your cam-

eras threads).

Aligning The Adapter:C.

Turn on your camera and zoom all the way1.

out.

Fit the adapter into the ring and look at2.


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the LCD screen.

Align the adapter until you have all edges of the Ground Glass (GG)3.

parallel with the edges of the LCD screen (you may want to zoom in

until the edges of the GG are close to the edges of the LCD screen for

better alignment).

Tighten the 3 allen head screws around4.

the thread ring once you are happy with

the alignment of the image on the LCD.

Zoom in until the edges of the Ground5.

Glass (GG) disappear and there are no

signs of vignetting (dark corners or sides).

This will be your outmost zoom level. From

your outmost zoom level you may zoom in

further to achieve a different Field of View(FOV).

Focusing The Camera Lens To The Ground Glass:D.

Point the adapter (Without a Lens at-1.

tached) toward a well illuminated surface

(white wall, sheet of paper) and by using

your Camera’s IRIS ADJUSMENT or DIAL

until the Ground Glass (GG) Grain Patternappears. Then, use your Camera’s FOCUS

ADJUSTMENT or DIAL to focus on the

grain until the pattern is distinct. You may

also use the AUTO FOCUS function of your

camera to focus on the Ground Glass (GG)

Grain Pattern. Once the Grain is in focus,

switch your camera back to MANUAL FO-

CUS. Your Ground Glass (GG) is now in Fo-cus.

Once you get your camera focused on the2.

GG properly, lock this focus setting down

(depending on your camera, you may

need to use tape to lock the focus ring in place). You may want to write

this number down for future reference.

Note: For each Field Of View (FOV) chosen you may need to set3.

your Camera’s Focus once more. It may be desirable to keep a

log of ZOOM and FOCUS settings for each camera being used.


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Attaching The Lens Mount And Lens :E.

Using the Allen Wrench Tool included with1.


located at the very front of your Letus35

Extreme 35mm DOF Adapter.

Insert the lens mount into the front tube2.

of the unit. Make sure to seat the mount

flush against the tube.

Tighten the three (3) set screws to firmly3.

lock the Lens Mount in place.

Now, attach the appropriate Lens to your4.

Lens Mount.

Powering Up The Letus35 Extreme:F.

Open the battery cover located on the1.

side of your Letus35 Extreme 35mm DOF

Adapter.

Insert 2 New AA Batteries.2.

Replace the Battery Cover.3.

Turn on the Letus35 Extreme 35mm DOF4.

Adapter by pressing the red LED buttonon the back. When in operating mode, the

LED will glow Red.

Happy Shooting:G.

You may want to readjust white balance for»

your camera according to taste. Do so by

following normal operations for your cam-

era to manually white balance.

Happy Shooting!»

Changing The Lens Mounts:III.

The Letus35 Extreme 35mm DOF adapter will al-

low you to use different lens types for your proj-

ect. Each lens type will require a unique lens

mount. Here are the steps to swap in/out the lensmounts:


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Using the Allen Wrench tool included with1.


located at the very front of your Letus35

Extreme 35mm DOF Adapter.Remove the current lens mount.2.

Insert the optional lens mount into the3.

front tube of the unit. Make sure to seat

the mount flush against the tube.

Tighten the three (3) set screws to firmly lock the Lens Mount in place.4.

Measuring Focus:IV.

The Film Plane for the Letus35 Extreme 35mmDOF Adapter is 28.2mm from the front of the tube

toward the main body. If you have the optional

support bracket, the back of this bracket is the

Film Plane; attach your tape measure to this sec-

tion on the adapter.

Adjusting Back Focus:V.

The back focus is set at the factory, so it should not need adjusting. In the event

that back focus for your Letus35 Extreme 35mm DOF Adapter needs to be ad-

justed, refer to this section. Generally, if your lens achieves Infinity Focus, your

shooting situations will not be affected. Some operators may also want to fur-

ther adjust for accurate barrel markings on Still Camera Lenses. Follow these

steps:

Testing The Focus: A.

Setup your camera with the Letus35 Extreme 35mm DOF Adapter us-1.

ing the preceding instructions, and attach a 50mm lens. (Any lens will

do, we’ve used a 50mm Lens because it is the easiest to use and widely

available amongst users).

Place a Siemens Star (available in the inside back cover of this manual)2.

in front of the lens at a predetermined distance. For this example we

will use a four (4) foot distance from Film Plane to the Siemens Star. To

determine the distance of the star you will need to measure from the

Film Plane to the star. (See: IV. Measuring Focus).Using the lens, focus on the Siemens Star. The focal markings should3.

correspond to your focal distance appropriately. Example: At four (4)

feet the Siemens Star should be the focus point of your image or in


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focus. If it is not, you may need to adjust back focus.

Adjusting The Focus:B.

There are two (2) cases where you may want to adjust the back focus:

Case 1: If your lens can achieve infinity focus at less than the infinity marking,

subsequently, the barrel markings are slightly off. This is how to fix it:

Gently loosen the three (3) set screws holding the lens mount.1.

Remove the lens mount and lens from the tube.2.

Located on the back of the lens mount3.

are three (3) small screws. Carefully, one

at a time, loosen each one a small amount.Each screw should be loosened an even

amount. About 0.2mm may do.

Re-insert the lens mount and attached4.

lens into the tube.

Tighten the three (3) set screws.5.

Re-peat the6. Testing The Focus step,

checking your focal marks for accuracy.

If yes, you are done. If not, repeat this step until back focus is correct-7.

ed.

Case 2: If you cannot achieve infinity focus at all ,

follow this method:

Remove the four (4) Allen Screws holding1.

the front tube to the body of the adapter

VERY carefully and VERY gently remove the2.

tube from the adapter. At this point youshould see the Ground Glass (GG) which is

mounted on three (3) Aluminum Posts.

VERY gently, and evenly, pull the three (3)3.

Aluminum Posts outward away from the

Body about 0.2mm one at a time.

Replace the front tube.4.

Repeat the5. Testing The Focus step.

If you do get infinity focus, then see if the6.

other markings are correct. If the markingsare also correct, you are done. If you can

get infinity focus but the marking is not

correct, go to the steps in Case 1 to fix it.


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If you are still unable to achieve Infinity Focus repeat these steps. Once7.

you are able to achieve Infinity Focus, next, repeat 1. Checking The

Focus for accuracy of your lens Focal Marks. If the lens Focal Marks are

inaccurate, follow Case 1 adjustment steps.

NOTES: Be VERY careful pulling the Ground Glass

(GG) posts away from the adapter body. Avoid

touching the Ground Glass (GG) with bare fingers

as it will transfer oils to the Film Plane and may

cause unwanted effects in your image. If, by ac-

cident, you happen to pull one of the posts from

its socket DO NOT PANIC! Remove the Rubber

Boot from the post VERY carefully, then, with a

toothpick or the allen wrench you received withyour adapter, gently tuck the Rubber Boot back

into the mounting hole. Then, carefully re-insert

the Aluminum Post into the rubber boot. DO NOT

attempt to force the Aluminum Post with Rubber

Boot attached into the mounting hole for risk of

damaging the boot and Ground Glass (GG) mount-

ing system. Take your time and be very careful.

Cleaning The System:VI.

We try our best to ship each unit free of dust in the

Optical Path. However, the Magic of Dust Particles

is always surprising. In which case you may need to clean the optical path, refer

to the steps listed below: NOTE: If the dust moves when the unit is operating

it will more than likely be located on the Ground Glass (GG) and you will only

need to perform steps 1 – 3.

Open the front tube of the Letus35 Ex-1.

treme 35mm DOF Adapter by removing

the four (4) screws and VERY carefully re-

move the tube. You will see the Ground

Glass (GG).

Clean the ground glass if you find the dust2.

there. Only go on to next step if the speck

is stationary when the ground glass is ro-

tating, if it is clean, put the tube back on. If not, continue to step 3.Clean the top surface of the condenser (the glass right below the3.

ground glass). If the speck goes away, you are done cleaning, put the

tube back on. If not, continue to step 4.


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Through the 2 holes on the ground glass4.

holder, unscrew the 2 Allen screws hold-

ing the enclosure cap to the body of the

adapter. Use a flat object to pry off the en-

closure cap from the body of the adapter.

Clean the other side of the condenser.5.

Clean the top surface of the prism.6.

Put the enclosure cap back on and use the7.

2 Allen screws to secure it in place again.

Do not over tighten them.

Put the front tube back on.8.

NOTE: Dust will not matter beyond this point,

unless it is a stain. To remove a stain, please send it

back to the factory for repair. The warranty WILL

BE VOIDED if you perform step 9 and beyond.

Pull the black rubber wedge at the roof of9.

the prism out with a pair of narrow pliers.

Take the battery compartment off and10.gently pull it out. Remember, the wires are

still attached to the battery compartment.

Lift the prism up by using the index finger11.

and the thumb.

Clean the prism with lens cleaning solu-12.

tion and put it back.

Put the rubber wedge back.13.

Put the enclosure cap back and use the 214.

allen screws to secure it in place. Do not

over tighten them.

Put the front tube back on.15.

CAUTION


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Trouble Shooting And Technical Support:VII.

In the case you encounter circumstances that are not described in this user

guide, please contact us at 1-877-77-LETUS (1-877-775-3887). We are open

Monday through Friday from 9AM to 5PM Pacific time. If you bought our

products through one of our authorized dealers and the adapter came not in

the optimal shape, PLEASE CALL US first before returning to the dealer.

Warranty:VIII.

Letus Corporation warrants that its products, when installed and used in accordance with the user

guide, will perform in accordance with specifications current as of the date of shipment, and will

be free from defects in material and workmanship for a period of one (1) year on new products

and ninety (90) days on repaired products and/or components. Excluded from this Warranty is any

physical damage caused by abuse, accident, or improper operation, and any lack of performanceattributable to such abuse, accident, or improper operation, as determined by Letus Corporation.

Letus Corporation shall not be liable for any incidental or consequential damages, including loss of

production time or money, regardless whether the product functioned properly or improperly for

any reason, including those for which Letus Corporation bears liability.

The one (1) year warranty period for new product shall be the one (1) year period beginning with

the date of the products receipt by the customer. The one (1) year warranty is non-transferable and

only applies to the original purchaser.

For repaired or replaced products, the repaired or replaced component is warranted to be free of

material and workmanship defects, and to perform its function in accord with Letus Corporationspecifications for a period of thirty (30) days from its date of shipment, or its original remaining

Warranty period, whichever is the latter. All claims under this Warranty shall be immediately sub-

mitted to Letus Corporation in writing and are subject to confirmation.

Should Letus Corporation deem it appropriate to return the accessory or a component to a Letus

Corporation-designated location, it will issue the buyer a Return Material Authorization Number

(RMA number), which must accompany all returns. The returned accessory or component shall

remain the property of the buyer who shall ship it freight prepaid to the designated Letus Corpo-

ration location with the RMA number clearly displayed on the packaging exterior and all paper-

work.

Letus Corporation, upon receipt and subsequent confirmation of a warranty defect, at its sole op-

tion, shall repair or replace the accessory or its component and return it freight prepaid to the

Buyer within twenty (20) days from date of its receipt. At Letus Corporation’s discretion, Buyer may

be responsible for shipping costs. Any upgraded return shipping method request made by the

Buyer shall be borne by the Buyer.

This Warranty is made in lieu of all other warranties whatsoever, express, implied and statutory. The

acceptance of any order with Letus Corporation is expressly made subject to the Buyer’s agree-

ment to this Warranty.

Return equipment items - including but not limited to the Letus35 Extreme, Letus35 Mini, Letus35

Ultimate, accessories, rods, rod support systems, lens mounts, and attire: All major equipment sales

carry a 14 day return policy (less a 20% restocking fee) with the exception of defective merchan-

dise. Defective merchandise is eligible for return within 14 days. If the item is found to be defective,


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the customer will receive a direct exchange, suitable replacement (if item has become discontin-

ued or unavailable), a repair, or in-house credit at the discretion of Letus Corporation.

Please note that the following items are not refundable for any reason: Shipping and handling

charges, rush processing charges, taxes, duty, processing charges, or other fees imposed on an

order.

A minimum restocking fee of 20% will be imposed on all non-defective merchandise. There is no

restocking fee on the return of defective merchandise. Letus Corporation reserves the right to

charge additional restocking fees for merchandise returned in less than acceptable condition.

A Return Merchandise Authorization (RMA) number must be obtained from Letus Corporation

prior to returning any merchandise. Any product returned to Letus Corporation without an RMA

number will be returned to the customer at the customer’s expense and no credit will be issued.

RMA numbers are valid for a period of 30 days only. Merchandise received beyond the 30 day pe-

riod will not be credited and will only be returned to the customer at the customer’s expense.

All returns must be shipped freight prepaid with the RMA number displayed on the outside of the

shipping box along with the number of boxes being shipped back (i.e. 1 of 3, 2 of 3, etc.). Letus Cor-

poration WILL NOT ISSUE CALL TAGS FOR ANY REASON WHATSOEVER. For your own protection, we

suggest shipping all returns fully insured and via traceable carrier. We will not be held responsible

for items damaged or lost in transit to us.

All returns will be credited based on the price paid on the invoice, or current selling price, which-

ever is lower, less any restocking fees.

All returns must include a copy of the Letus Corporation invoice, and a letter explaining the reason

for return.

All non-defective returns must be in new, re-sellable condition with all original unmarked packag-

ing, accessories, manuals and unmarked warranty cards. Items showing signs of use will not be

accepted for credit.

Letus Corporation reserves the right to have defective merchandise exchanged for replacement

or repair.

Please allow up to 14 business days for Letus Corporation to process and credit a return. Actual

time for credit to appear on bank card will vary from bank to bank.


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NotesIX.


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Focusing Aid

letus35 extreme

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