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About Photography / Hobbyist sulevlangeMale/Estonia Recent Activity
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September 04, 2018 by sulevlange September 04, 2018 :iconsulevlange:sulevlange 5 0 Lifecycle (4/4) by sulevlange Lifecycle (4/4) :iconsulevlange:sulevlange 3 0 Lifecycle (3/4) by sulevlange Lifecycle (3/4) :iconsulevlange:sulevlange 5 0 Lifecycle (2/4) by sulevlange Lifecycle (2/4) :iconsulevlange:sulevlange 5 0 Lifecycle (1/4) by sulevlange Lifecycle (1/4) :iconsulevlange:sulevlange 3 0 29, 2018 by sulevlange 29, 2018 :iconsulevlange:sulevlange 5 0 Blueberries by sulevlange Blueberries :iconsulevlange:sulevlange 8 0 Shroom by sulevlange Shroom :iconsulevlange:sulevlange 4 0 Predator by sulevlange Predator :iconsulevlange:sulevlange 2 0 Scarab by sulevlange Scarab :iconsulevlange:sulevlange 5 0 Spider 2 by sulevlange Spider 2 :iconsulevlange:sulevlange 5 0 Spider by sulevlange Spider :iconsulevlange:sulevlange 3 0 Light by sulevlange Light :iconsulevlange:sulevlange 17 3 Forest Road by sulevlange Forest Road :iconsulevlange:sulevlange 77 6 July 28, 2018 by sulevlange July 28, 2018 :iconsulevlange:sulevlange 8 1 August 06, 2018-III by sulevlange August 06, 2018-III :iconsulevlange:sulevlange 8 0


Sahasrara by Yesterdawn Sahasrara :iconyesterdawn:Yesterdawn 153 12 Moss and needles by Vanilla-Shadowgame Moss and needles :iconvanilla-shadowgame:Vanilla-Shadowgame 1 0 vanilla asylum by Apofiss vanilla asylum :iconapofiss:Apofiss 2,348 29 no below ii by hannes-flo no below ii :iconhannes-flo:hannes-flo 93 4 Edinburgh by newcastlemale Edinburgh :iconnewcastlemale:newcastlemale 294 102 Hidden giant... by Omoidenoki Hidden giant... :iconomoidenoki:Omoidenoki 53 45 Great Wide Open v4 by hannes-flo Great Wide Open v4 :iconhannes-flo:hannes-flo 92 3 view from Palazzo Vecchio by hannes-flo view from Palazzo Vecchio :iconhannes-flo:hannes-flo 85 4 Dsc04963-1 by vampk1tty Dsc04963-1 :iconvampk1tty:vampk1tty 26 10 Deer by MoonKey19 Deer :iconmoonkey19:MoonKey19 68 9 Lavradeira - Ballpoint Pen by VianaArts Lavradeira - Ballpoint Pen :iconvianaarts:VianaArts 320 18 Marvelous Path by MohannadKassab Marvelous Path :iconmohannadkassab:MohannadKassab 54 3 monolith ii by hannes-flo monolith ii :iconhannes-flo:hannes-flo 107 5 Jay Set8-1 by vampk1tty Jay Set8-1 :iconvampk1tty:vampk1tty 33 2 Wastwater by newcastlemale Wastwater :iconnewcastlemale:newcastlemale 1,360 422 Waiting ! by MohannadKassab Waiting ! :iconmohannadkassab:MohannadKassab 32 2


I like it! Feels fresh and so spontaneous. The distant bokeh and background melt into one. Good positioning. Focus is perfect! Feels li...


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Pentax K-50

Pentax DA* 50-135 f2.8 + HOYA super pro1 UV filter 67"
Pentax 18-55 DAL WR f3.5-5.6 52"
Cosinon-S 50 f1.8 + HOYA UV filter 49"
Tamron 17-50 f2.8 67"

Xforce 10-stop ND filter
Yongnuo YN660 + Yongnuo YN560TX + circular disk diffuser
macro extension tubes
Zomei Q555 tripod
5 in 1 reflector
umbrella + stand + flash bracket

The short answer:

Bokeh doesn't increase linearly with focal length.

The longer version

by the way, I haven't tested my claims yet, so take it with a bag of salt

I made this illustration to show how FF behaves to APS-C(or any other smaller sensor).
The lens makes one big round image. The FF sensor captures that rectangle in the center, because that's how a FF sensor looks like - it's a rectangle.

If we use the same lens on a crop sensor, that lens would still produce the same image, but the crop sensor will only capture the middle part, because it's a smaller sensor.

Artboard 1 by sulevlange

Here's where it gets a little confusing for many.
Let's say we used a 50mm FF lens. Because the APS-C sensor has a 1,5 times shorter edges(and 2,25 time less surface area) as the FF sensor, we use a crop factor of 1,5.  A shot taken with a 50mm lens on a aps-c body looks like a 75mm.

While the Field of View looks like a 75mm, the picture itself looks like a 50mm cropped 1,5 times. What's the difference?

It's in the bokeh - depth of field.

If we used a 75mm lens on a FF body, we would get the same field of view, but the out of focus areas would be more blurry.

The conclusion is simply the following:

  • First, if we use a lens on APS-C, we'll get an image that's cropped in 1,5 times. Meaning that we get an image that has bigger bokeh(because we zoom into that picture), but a narrower field of view(50mm x 1,5=75mm). 
  • Secondly, if we want to keep the field of view the same for both systems, we will get more bokeh on the FF sensor, because a longer lens produces bigger bokeh than what the 1,5x crop factor can make up for.  That's why it's said that f/2.8 on aps-c looks like f/4 on FF.


I thought it's good to share my thoughts on the matter, because for a long time, I didn't understand why the bokeh looked better on FF. It all comes down to the fact that bokeh doesn't increase linearly with focal length. A 75mm lens on a FF is not the same as a 50mm on aps-c.
You can think about it this way: if you take a wide angle shot at 2,8 and crop it to a very narrow focal length equivalent, the image will have a lot more depth of field than something shot with a long lens.


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lucytherescuedcat Featured By Owner Jun 5, 2018  Hobbyist Photographer
sulevlange Featured By Owner Jun 6, 2018  Hobbyist Photographer
Neko Emoji-37 (Yay) [V2] 
SkyfireDragon Featured By Owner Jun 5, 2018   Artisan Crafter
Happy Birthday! Dragon Bullet - Green Cake
sulevlange Featured By Owner Jun 6, 2018  Hobbyist Photographer
thanks!Bunny Emoji-66 (Thank you arigatou) [V3] 
SkyfireDragon Featured By Owner Jun 6, 2018   Artisan Crafter
Your very welcome! :D
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