Low Light Photography for dummies

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<ul><li><p>7/21/2019 Low Light Photography for dummies</p><p> 1/219</p><p>LET THERE BE MORE</p><p>LIGHTEugene V. Bobukh</p></li><li><p>7/21/2019 Low Light Photography for dummies</p><p> 2/219</p><p>To Make This Presentation( !"#$%&amp;'</p><p> About 70 hours were forever lost forFacebook</p><p> 6.2 Gb of disk sace was occuied !00" hotos were taken # $ % drinking arties were &amp;issed' (o )*&amp; glad that +ou*ve &amp;ade it here</p></li><li><p>7/21/2019 Low Light Photography for dummies</p><p> 3/219</p><p>is)*ai+er( !"#$%&amp;'</p><p> ,his is not a for&amp;al hotograh+course</p><p> ) a&amp; not a rofessional (o ) can do it -ust however it leases &amp;e</p><p> )f +ou don*t like &amp;+ st+le/ hire a ro for1</p><p> ) will notcover &amp;an+ ver+ i&amp;ortant</p><p>things (uch as laws of co&amp;osition or studiosetu</p><p> ) a&amp; -ust an e34h+sicist who*s doneso&amp;e #00/000 hotos in )5/ visual/ V/</p><p>VV and 5A8</p></li><li><p>7/21/2019 Low Light Photography for dummies</p><p> 4/219</p><p>,But Bugs Are (till :ossible)f +ou sot ;e&amp;/ reort ;e&amp;'</p></li><li><p>7/21/2019 Low Light Photography for dummies</p><p> 5/219</p><p>-. .O/ /HE.E0ER1BO123 RE-1</p><p>?@CD/ ?HIJ</p></li><li><p>7/21/2019 Low Light Photography for dummies</p><p> 6/219</p><p>The 0er4 5irst Photo</p><p> KL!26</p><p> MView fro&amp; theNindow at OeGras&lt; b+ Poseh</p><p>QicRhore QiRce</p><p> ,aken on bitu&amp;enas a &amp;edia</p><p> ! hours e3osure</p><p> Slearl+/ therewas not enoughlight</p></li><li><p>7/21/2019 Low Light Photography for dummies</p><p> 7/219</p><p>3in)e Then</p><p> :hotograh+ has gone a long/ long wa+T Tbut there is still often not enough light</p></li><li><p>7/21/2019 Low Light Photography for dummies</p><p> 8/219</p><p>6ten7 /e 3ee 3o+ethin8 Like That</p></li><li><p>7/21/2019 Low Light Photography for dummies</p><p> 9/219</p><p>-n9 It T:rns O:t LikeThat</p></li><li><p>7/21/2019 Low Light Photography for dummies</p><p> 10/219</p><p>Ho; o /e Make It Better?B-3I@ THEOR1:ractice without a theor+ is like wine without a toast'</p></li><li><p>7/21/2019 Low Light Photography for dummies</p><p> 12/219</p><p>@a+era isse)te9</p><p>5ealit+ is Ttough'</p><p> Ne need asi&amp;ler &amp;odel toget the essenceof the rocess</p></li><li><p>7/21/2019 Low Light Photography for dummies</p><p> 13/219</p><p>- 3Aheri)a* @a+era in 0a)::+</p><p>F U</p><p>r</p><p>a</p><p>b</p><p>3</p><p>3 LWXLWF Y LWUZb a[X3WUZ</p><p>suall+ U 11 F/ so 3 \ F and b \ a[XFWUZ</p></li><li><p>7/21/2019 Low Light Photography for dummies</p><p> 14/219</p><p>EAos:re (3h:tter 3Aee97CD$!F'</p><p>F U</p><p>r</p><p>a</p><p>b</p><p>3</p><p>,+ical ,] LWL%thY LW%00thof a second Xdenoted as </p></li><li><p>7/21/2019 Low Light Photography for dummies</p><p> 15/219</p><p>-Aert:re ("JK'</p><p>rF</p><p>Oight co&amp;es fro&amp; all directions. ^hotons cross each &amp;2of a surface near</p><p>the ca&amp;era</p><p>_ow &amp;an+ hotons get inside` ^[r2</p><p>,he+ are ro-ected on the focushe&amp;ishere with the area ( 2F2</p><p>:hotons count er &amp;2of the inner i&amp;ageis B W( ^[XrWFZ2</p><p>Intro9:)e . 5&gt;r</p><p>It is called @ jmIZ and standsbehind F in the lens na&amp;e Xe.g./ for FW#.%Q #.%Z</p><p>,hen B p^WQ2</p><p>Oenses with the sa&amp;e Q roduce i&amp;ages</p><p>of the sa&amp;e brightness regardless of thefocal length['</p><p>Bear ;ith +eN</p><p>This is the +ost )o+A*e +ath o6 the;ho*e Aresentation</p><p>The rest ;i** e easier I Aro+ise </p><p>3ta4 t:ne9N</p></li><li><p>7/21/2019 Low Light Photography for dummies</p><p> 16/219</p><p>-t 5&gt;Q?7 The4 -** -re The 3a+eN</p><p>9/ onl+ brightness is the sa&amp;e. Al&amp;ost.</p></li><li><p>7/21/2019 Low Light Photography for dummies</p><p> 17/219</p><p>CGates OAene9 4 the .tho6 the5o)a* Len8thF</p><p>U FWL6 U FW% U FWL.$</p><p>1 1 1 1 icture brightness 1 1 1 1 </p></li><li><p>7/21/2019 Low Light Photography for dummies</p><p> 18/219</p><p>The *esser .7 the ri8hter thei+a8e</p></li><li><p>7/21/2019 Low Light Photography for dummies</p><p> 19/219</p><p>E.OGH THEOR1 5OR.O/</p><p>A ractical roble&amp;]</p><p>)t is too dark._ow do +ou let &amp;ore light in`</p></li><li><p>7/21/2019 Low Light Photography for dummies</p><p> 20/219</p><p>.e; Gates 34n9ro+e</p><p>_ow do +ou let &amp;ore shee in`</p></li><li><p>7/21/2019 Low Light Photography for dummies</p><p> 21/219</p><p>T;o OAtions</p><p>L. ee the gates oen longer )ncreaseE3osure</p><p>2. 9en the&amp; wider 5educe Aerture</p></li><li><p>7/21/2019 Low Light Photography for dummies</p><p> 22/219</p><p>P-RT &gt;?ESPO3RE</p></li><li><p>7/21/2019 Low Light Photography for dummies</p><p> 23/219</p><p>In)rease 3h:tter Ti+e?-PERTRE</p></li><li><p>7/21/2019 Low Light Photography for dummies</p><p> 56/219</p><p>Re+e+er&lt; Bri8htness c =&gt;.</p><p>,he a&amp;ount of light is roortional to</p><p>the inverse sd:areof the F4nu&amp;ber'</p><p>,his is a serious businessore serious that UoF K Q</p><p>(o Srank the Oens 9en'</p></li><li><p>7/21/2019 Low Light Photography for dummies</p><p> 57/219</p><p>5`n:+er an9 Bri8htness-Aert:re Bri8htnes</p><p>s(5&gt;Q? as=\\'</p><p>FWLL 0.L0</p><p>FW!.0 0.L</p><p>FW%.6 0.#5&gt;Q? =\\</p><p>FW2.! L.%6</p><p>FW2.0 #.06</p><p>FWL.! #.7!</p><p>FWL.$ 6.2%</p><p>FWL.2 !.%L</p></li><li><p>7/21/2019 Low Light Photography for dummies</p><p> 58/219</p><p>5`n:+er an9 Bri8htness-Aert:re Bri8htnes</p><p>s(5&gt;Q? as=\\'</p><p>FWLL 0.L0</p><p>FW!.0 0.L</p><p>5&gt;?_ \QFW#.% L.00</p><p>FW2.! L.%6</p><p>FW2.0 #.06</p><p>FWL.! #.7!</p><p>FWL.$ 6.2%</p><p>FWL.2 !.%L</p></li><li><p>7/21/2019 Low Light Photography for dummies</p><p> 59/219</p><p>5`n:+er an9 Bri8htness-Aert:re Bri8htnes</p><p>s(5&gt;Q? as=\\'</p><p>FWLL 0.L0</p><p>5&gt;f\ \=</p><p>FW%.6 0.#FW#.% L.00</p><p>FW2.! L.%6</p><p>FW2.0 #.06</p><p>FWL.! #.7!</p><p>FWL.$ 6.2%</p><p>FWL.2 !.%L</p></li><li><p>7/21/2019 Low Light Photography for dummies</p><p> 60/219</p><p>5`n:+er an9 Bri8htness-Aert:re Bri8htnes</p><p>s(5&gt;Q? as=\\'</p><p>5&gt;== \=\</p><p>FW!.0 0.L</p><p>FW%.6 0.#FW#.% L.00</p><p>FW2.! L.%6</p><p>FW2.0 #.06</p><p>FWL.! #.7!</p><p>FWL.$ 6.2%</p><p>FWL.2 !.%L</p></li><li><p>7/21/2019 Low Light Photography for dummies</p><p> 61/219</p><p>5`n:+er an9 Bri8htness-Aert:re Bri8htnes</p><p>s(5&gt;Q? as=\\'</p><p>FWLL 0.L0</p><p>FW!.0 0.L</p><p>FW%.6 0.#5&gt;Q? =\\</p><p>FW2.! L.%6</p><p>FW2.0 #.06</p><p>FWL.! #.7!</p><p>FWL.$ 6.2%</p><p>FWL.2 !.%L</p></li><li><p>7/21/2019 Low Light Photography for dummies</p><p> 62/219</p><p>5`n:+er an9 Bri8htness-Aert:re Bri8htnes</p><p>s(5&gt;Q? as=\\'</p><p>FWLL 0.L0</p><p>FW!.0 0.L</p><p>FW%.6 0.#FW#.% L.00</p><p>5&gt;f =?_</p><p>FW2.0 #.06</p><p>FWL.! #.7!</p><p>FWL.$ 6.2%</p><p>FWL.2 !.%L</p></li><li><p>7/21/2019 Low Light Photography for dummies</p><p> 63/219</p><p>5`n:+er an9 Bri8htness-Aert:re Bri8htnes</p><p>s(5&gt;Q? as=\\'</p><p>FWLL 0.L0</p><p>FW!.0 0.L</p><p>FW%.6 0.#FW#.% L.00</p><p>FW2.! L.%6</p><p>5&gt;\ Q\_</p><p>FWL.! #.7!</p><p>FWL.$ 6.2%</p><p>FWL.2 !.%L</p></li><li><p>7/21/2019 Low Light Photography for dummies</p><p> 64/219</p><p>5`n:+er an9 Bri8htness-Aert:re Bri8htnes</p><p>s(5&gt;Q? as=\\'</p><p>FWLL 0.L0</p><p>FW!.0 0.L</p><p>FW%.6 0.#FW#.% L.00</p><p>FW2.! L.%6</p><p>FW2.0 #.06</p><p>5&gt;=f Q^f</p><p>FWL.$ 6.2%</p><p>FWL.2 !.%L</p></li><li><p>7/21/2019 Low Light Photography for dummies</p><p> 65/219</p><p>5`n:+er an9 Bri8htness-Aert:re Bri8htnes</p><p>s(5&gt;Q? as=\\'</p><p>FWLL 0.L0</p><p>FW!.0 0.L</p><p>FW%.6 0.#FW#.% L.00</p><p>FW2.! L.%6</p><p>FW2.0 #.06</p><p>FWL.! #.7!</p><p>5&gt;=g _?</p><p>FWL.2 !.%L</p></li><li><p>7/21/2019 Low Light Photography for dummies</p><p> 66/219</p><p>5`n:+er an9 Bri8htness-Aert:re Bri8htnes</p><p>s(5&gt;Q? as=\\'</p><p>FWLL 0.L0</p><p>FW!.0 0.L</p><p>FW%.6 0.#FW#.% L.00</p><p>FW2.! L.%6</p><p>FW2.0 #.06</p><p>FWL.! #.7!</p><p>FWL.$ 6.2%</p><p>5&gt;= f?=</p><p>X(i&amp;ulated b+ e3osure change UoF is not actualZ</p></li><li><p>7/21/2019 Low Light Photography for dummies</p><p> 67/219</p><p>3o7 OAen -Aert:re Get a 5ast Lens</p><p> Good news] FWL.! are reasonabl+ine3ensive Sanon %0&amp;&amp; LL0</p><p>Qikon %0&amp;&amp; fWL.!U AF L#% )f +ou can aqord an+ U(O5/ +ou &amp;ost</p><p>likel+ can aqord an FWL.! lens as well</p></li><li><p>7/21/2019 Low Light Photography for dummies</p><p> 68/219</p><p>B- .E/3Q? as=\\'</p><p>FWLL 0.L0</p><p>FW!.0 0.L</p><p>FW%.6 0.#</p><p>FW#.% L.00</p><p>FW2.! L.%6</p><p>FW2.0 #.06</p><p>FWL.! #.7!</p><p>FWL.$ 6.2%FWL.2 !.%L</p><p>5&gt;\^ ?\X(i&amp;ulated b+ e3osure change UoF is not actualZ</p><p>C/h4</p></li><li><p>7/21/2019 Low Light Photography for dummies</p><p> 194/219</p><p>FW#.% FW0.7</p><p>/h4 *ar8er +atri)es ;i** nothaXe *esser o5</p></li><li><p>7/21/2019 Low Light Photography for dummies</p><p> 195/219</p><p>,hought e3eri&amp;ent of taking a icture andcutting awa+ the edges of the &amp;atri3 _oweverT.</p><p> Nhen viewed on the screen/ the erceived UoF</p><p>&amp;a+ change ,he [actual[ infor&amp;ation in the icture will not</p><p> )f all si|es are increased Q ti&amp;es Xlens/ ca&amp;era/sensor ele&amp;ent Y to reserve &amp;egai3el countZ itwill change LWQ ti&amp;es ,hat*s wh+ :( will have lesser UoF</p><p> )f sensor ele&amp;ent si|e won*t change/ UoF willchange as LWQ2.</p><p>o5 5or+:*a is 3i+A*ePra)ti)a* -AA*i)ations Ma4 Be @on6:sin8</p></li><li><p>7/21/2019 Low Light Photography for dummies</p><p> 196/219</p><p> Generall+/ 9dros as LWF2</p><p> !%&amp;&amp; FW! will havethe sa&amp;e Ueth 9fField as #%&amp;&amp; FWL.$'</p><p> Tbut if sub-ect</p><p>occuies the sa&amp;eart of the i&amp;age/ 9does not deend on F'</p><p> Tbut/ dWUX</p></li><li><p>7/21/2019 Low Light Photography for dummies</p><p> 197/219</p><p>L. UoF QWF2</p><p>2. )f ) want to kee ~3edUoF/ ) &amp;ust &amp;aintain Q F2</p><p>#. A&amp;ount of light LWQ2</p><p>$. For ~3ed visiblei&amp;ression/ e3osition , LWO</p><p>%. ,herefore/ , Q2 F$for~3ed UoF</p><p>6. ,hat*s one of the reasonsit*s so hard to deal withlong lensesT</p><p>5a)e [ E4es Tra)kin8</p></li><li><p>7/21/2019 Low Light Photography for dummies</p><p> 198/219</p><p>I3O :anti)ation = Fil&amp; )(9 de~nition]</p></li><li><p>7/21/2019 Low Light Photography for dummies</p><p> 199/219</p><p> (ensitivit+ 0.!W_ _ Y e3osure in lu3[sec where logL0 otical densit+ is 0.L above fog level/ or L00.L L.263</p><p>darker L lu3[sec L l&amp;[secW&amp;2 Brightness in lu&amp;ens [:/ : is irradiance in energ+ units/ Natts is conversion coe}cient between energ+ units and lu&amp;ens erceived b+ hu&amp;ans. )t is</p><p>strongl+ wavelength deendent.</p><p> For a &amp;o&amp;ent/ let*s ~gure out the stor+ with green lightwhere 6!# l&amp;WNt</p><p> _ 0.!W( Xassu&amp;ing L s. &amp;eterZ 1 : _W 0.!WX(Z. )f( L )(9/ : 0.!W 0.!W6!# \\\==^ po:*es.</p><p>I3O :anti)ation Uigital could be aroached in several wa+s</p><p>B tibilit ith ~l Ui it l d ~l f th )(9 h ld d i il i t</p></li><li><p>7/21/2019 Low Light Photography for dummies</p><p> 200/219</p><p>L. B+ co&amp;atibilit+ with ~l&amp;. Uigital and ~l&amp; of the sa&amp;e )(9 should roduce si&amp;ilar ictures</p><p>under si&amp;ilar illu&amp;ination. Fil&amp; )(9 L e3osed to 0.! lu3[seconds roduces oticaldensit+ of 0.L which corresonds to the beginning of its usable </p></li><li><p>7/21/2019 Low Light Photography for dummies</p><p> 201/219</p><p>other light sources` (a+ for dee red 700 n&amp; do we</p><p>need to use 2. l&amp;WNt conversion` ,he answer is no if we are interested in energ+ Xor</p><p>hotonsZ absorbed b+ the &amp;atri3 as oosed to enteringthe ca&amp;era.</p><p> 8es/ a ca&amp;era &amp;a+ have a resonse curve si&amp;ilar tohu&amp;an*s e+e. But that is due to a ~lter sitting before the</p><p>sensor/ blocking of 700 n&amp; light. ,he unrotected sensor*s sensitivit+ at that wavelengthis still ver+ high. 5oughl+/ it is at fro&amp; $00 to !00 n&amp;X so&amp;e L.%3/ which we ignore at this level of detailZ inter&amp;s of uantu&amp; e}cienc+ Y that*s it/ in hotons count.</p><p> ,herefore/ we still need about #.$!!eL6 hotons to beabsorbed b+ )(9 L sensor of L &amp;2 for </p></li><li><p>7/21/2019 Low Light Photography for dummies</p><p> 202/219</p><p>7!% 2! hotons/ or #.6 9ther reference ~gures] :( ca&amp;era with 23# {&amp;2 sensor )(9 L600] L#L hotons/ !.7</p><p>noise U(O5 )(9 L600/ e3osure L0 of the </p></li><li><p>7/21/2019 Low Light Photography for dummies</p><p> 203/219</p><p>I3O \\\7 noise g\</p></li><li><p>7/21/2019 Low Light Photography for dummies</p><p> 204/219</p><p>:ant:+ .oise M:*tiA*eEAos:res</p></li><li><p>7/21/2019 Low Light Photography for dummies</p><p> 205/219</p><p>sed &amp;ostl+ b+ astrono&amp;ers )dea] take : 11 L hotos/ carefull+</p><p>average 1 noise dros : ti&amp;es suall+ reuires secial software 5euires scenes that don*t change</p><p>while +ou are shooting L00 fra&amp;es</p><p>.oise 5ie9 T8t EAos:re Mo9e</p></li><li><p>7/21/2019 Low Light Photography for dummies</p><p> 206/219</p><p>Li8ht @o*or E0 red:ire9.oiseLeXe*</p><p>.oise in B/Mo9e .oise Re9:)tion</p><p>5ed 42.67 $.606 #.L%L7 L.$%%28ellow 42.## $.$0%L #.L#% L.270LGreen 42 $.66# 2.0! L.760$S+an 42.### $.L0$ 2.!!0L L.22#</p><p>Blue 42 %.7%2 #.67L7 2.0!0#V 40.## 6.#L#L #.!L!# 2.$$!</p><p>/hite Ba*an)e Too /ar+</p></li><li><p>7/21/2019 Low Light Photography for dummies</p><p> 207/219</p><p>5i*ters Ori8ina*</p></li><li><p>7/21/2019 Low Light Photography for dummies</p><p> 208/219</p><p>5i*ters Re9:)e .oise</p></li><li><p>7/21/2019 Low Light Photography for dummies</p><p> 209/219</p><p>5i*ters -n8*e9 Br:sh</p></li><li><p>7/21/2019 Low Light Photography for dummies</p><p> 210/219</p><p>3+o8 [ 5o8Are friends. Eseciall+ in Sontour </p></li><li><p>7/21/2019 Low Light Photography for dummies</p><p> 211/219</p></li><li><p>7/21/2019 Low Light Photography for dummies</p><p> 212/219</p><p>5o):sin8 in the 9arkness</p></li><li><p>7/21/2019 Low Light Photography for dummies</p><p> 213/219</p><p>(ot4focusing on contrast borders worksbest :oint and refra&amp;e</p><p> ) tend to carr+ a s&amp;all laser ointer for</p><p>that</p><p>Li8ht reve)tion in *enses</p></li><li><p>7/21/2019 Low Light Photography for dummies</p><p> 214/219</p><p>suall+ not a roble&amp; But chea ~lters/ on non4xx light can eat</p><p>u to L04L% light 9q4center i&amp;ages &amp;a+ be darker</p><p>0i8nettin8</p><p> $</p></li><li><p>7/21/2019 Low Light Photography for dummies</p><p> 215/219</p><p>KXSosZ$</p><p>' a+ get serious at the edges (trongl+ lens4deendent anufacturers generall+ tr+ to co&amp;bat it</p><p>5i*+ 3ensii*iation</p></li><li><p>7/21/2019 Low Light Photography for dummies</p><p> 216/219</p><p>_+drogen</p><p>One o6 EAeri+enta* 3et:As</p></li><li><p>7/21/2019 Low Light Photography for dummies</p><p> 217/219</p></li><li><p>7/21/2019 Low Light Photography for dummies</p><p> 218/219</p><p>-n E88 in 0 Li8ht</p></li><li><p>7/21/2019 Low Light Photography for dummies</p><p> 219/219</p></li></ul>