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#7591442 - 03/07/14 07:33 AM APS-C versus Full Frame aperture question?
ewraven Offline
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Registered: 03/30/02
Posts: 42423
Loc: Dept. of Ruminant Procurement
I was given this old film SLR...



Lucky me, it is the same mount as my Sony camera and came with two lenses...



The lenses are a Sigma DL 75-300mm F4-5.6 Macro and a Minolta 50mm F 1.7

Everything was loose in a big case all these years. I trashed the old case. Other than some cosmetic scuffs, the lenses look and perform great. The 75-300mm has that push/pull style of zoom action. And it isn't very smooth.

The crop factor on my camera is 1.52x which makes the zoom lens a 114 - 456mm lens. While the 50mm is a 76mm on my APS-C Sony. What about the aperture? Does it get converted as well?

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#7591447 - 03/07/14 07:38 AM Re: APS-C versus Full Frame aperture question? [Re: ewraven]
LNXGUY Offline
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Registered: 08/06/00
Posts: 106840
Loc: Barrie, Ont,
I can't see how the aperture would change...
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'09 E90 335d

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#7591520 - 03/07/14 08:28 AM Re: APS-C versus Full Frame aperture question? [Re: LNXGUY]
Voltron Offline
Post Master Supreme


Registered: 08/17/01
Posts: 28593
Loc: Not Found
nope. Only focal length.
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#7591580 - 03/07/14 08:59 AM Re: APS-C versus Full Frame aperture question? [Re: Voltron]
tylerdurden Offline
Post Master Supreme


Registered: 03/31/02
Posts: 25862
Loc: Shyea, like I'm telling you
The effective DOF does change, yes. A 50 1.4 on a MFT camera is effectively a 100 2.8.
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#7591591 - 03/07/14 09:03 AM Re: APS-C versus Full Frame aperture question? [Re: tylerdurden]
tylerdurden Offline
Post Master Supreme


Registered: 03/31/02
Posts: 25862
Loc: Shyea, like I'm telling you
You can play around with this to see the difference.

http://www.onlineconversion.com/field_depth.htm

I'll be honest and say I don't know why the effective FOV change also changes DOF (seems to me it's just like cropping in PS), but it do.

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#7591782 - 03/07/14 10:20 AM Re: APS-C versus Full Frame aperture question? [Re: tylerdurden]
ewraven Offline
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Registered: 03/30/02
Posts: 42423
Loc: Dept. of Ruminant Procurement
Thanks for the link and thanks everyone for the info.
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#7591802 - 03/07/14 10:36 AM Re: APS-C versus Full Frame aperture question? [Re: ewraven]
busfare Offline
tickets plz
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Registered: 11/09/00
Posts: 14597
Loc: Dark Side of the Moon
Light exposure doesn't change.

If you shoot FF at 55mm, your DOF is the same as shooting 83mm on crop if you stand in the same spot. Granted the crop shot will be tighter. If you move further back to get same field of view, that's when the DOF changes.

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#7594060 - 03/09/14 04:51 PM Re: APS-C versus Full Frame aperture question? [Re: tylerdurden]
NOT spotch... Offline
Post Master Supreme


Registered: 07/25/00
Posts: 57149
 Originally Posted By: tylerdurden
You can play around with this to see the difference.

http://www.onlineconversion.com/field_depth.htm

I'll be honest and say I don't know why the effective FOV change also changes DOF (seems to me it's just like cropping in PS), but it do.


It's like, physics 'n shit.
http://mobile.nytimes.com/blogs/pogue/2013/02/21/blurry-backgrounds-big-sensors-and-bokeh/
_________________________
"On the street where there is no lap timer, feel is all that matters" - scootergeek
"A bunch of nerdy douchebags chasing a ghost." -Ob1 on bitcoin

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#7622556 - 03/28/14 11:42 AM Re: APS-C versus Full Frame aperture question? [Re: NOT spotch...]
flyEX #1 Administrator Offline
Man in the Box
Post Master Supreme


Registered: 01/05/00
Posts: 26631
Loc: Down in a Hole
http://petapixel.com/2014/03/28/concise-explanation-crop-factor-affects-focal-length-aperture/
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