older lens on AF crop camera
Nov 7, 2016 11:52:22 #
My camera asks for the mm when I attach a non-'A' lens. If my lens is FF 80mm, do I enter 120mm? I think this was answered before but my mind either lacks the storage space or I forgot to keyword the answer.
Nov 7, 2016 11:56:41 #
The actual focal length does not change.
If you put any 80 mm lens: medium format (if you can adapt it,) FF or APS-C on your camera, you will get the same image.
It's still an 80mm lens no matter what camera you put it on, so I would say enter 80.
If you put any 80 mm lens: medium format (if you can adapt it,) FF or APS-C on your camera, you will get the same image.
It's still an 80mm lens no matter what camera you put it on, so I would say enter 80.
Nov 8, 2016 08:37:17 #
80. BTW is this lens a prime or a zoom say 80-200. If that is the case you enter the focal length in use. I put in 200 and be done with it. Check pentaxforums.com.
Got a great camera there Rich.lol
Got a great camera there Rich.lol
Nov 8, 2016 12:07:06 #
Nov 8, 2016 21:17:19 #
Has anyone else has ever noticed that batteries, in general, seem to have a shorter lifespan in telephoto lenses than with wide angle lenses? Every think about why you can generally hand hold a wide angle lens at a slower shutter speed than with a tele lens?
The answer to both of these questions will give you a very good hint as to why you need to punch-in the higher MM size of zoom lens and correct size of a prime if available otherwise the closest next higher.
The answers are fairly simple. For question #2, less camera shake is recorded at a wider angle lens than a tele lens. Now add that to the 1st question.
Less battery drain because there is less anti-shake needed for wide angle lenses. So if you enter the higher mm of a lens, the camera/lens will tell the anti shake to move more and that will cover the longer lenses and still be able to cover the shorter ones.
Reality is, you don't need to enter any mm size at all if you can properly use a tripod.
The answer to both of these questions will give you a very good hint as to why you need to punch-in the higher MM size of zoom lens and correct size of a prime if available otherwise the closest next higher.
The answers are fairly simple. For question #2, less camera shake is recorded at a wider angle lens than a tele lens. Now add that to the 1st question.
Less battery drain because there is less anti-shake needed for wide angle lenses. So if you enter the higher mm of a lens, the camera/lens will tell the anti shake to move more and that will cover the longer lenses and still be able to cover the shorter ones.
Reality is, you don't need to enter any mm size at all if you can properly use a tripod.
Nov 9, 2016 09:37:09 #
romanticf16
Loc: Commerce Twp, MI
RichardE wrote:
My camera asks for the mm when I attach a non-'A' lens. If my lens is FF 80mm, do I enter 120mm? I think this was answered before but my mind either lacks the storage space or I forgot to keyword the answer.
The magnification is the same, only the crop is different.
Nov 9, 2016 16:16:41 #
romanticf16 wrote:
The magnification is the same, only the crop is different.
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Thanks. Makes sense.
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