Posts for: was_a_guru
Jan 23, 2018 18:37:03 #
A FX sensor is ~24mm x 36 mm. A DX sensor is ~16mm x 24mm. A Xmm FX lens would project an image that fills an FX sensor and overfills a DX sensor on those respective cameras. Thus a FX lens on a DX camera should have the effect of a telephoto of 1.5x.
Jan 23, 2018 17:32:21 #
"The images he supplied were all taken with a DX format camera"
Correct, the picture taken with the 50mm DX looks exactly the same as the picture taken with the 50mm FX (both taken on my DX format camera).
Same is true with 35mm DX & FX lenses.
Correct, the picture taken with the 50mm DX looks exactly the same as the picture taken with the 50mm FX (both taken on my DX format camera).
Same is true with 35mm DX & FX lenses.
Jan 23, 2018 14:12:30 #
So I experimented. With my camera on a tripod took three shots:
1. With my 18-55mm lens set at ~50mm, in A mode - f/5.6, 1/160, ISO 800
2. With the Series E 35mm lens, in M mode - manually set f/5.6, 1/160, camera set ISO 800
3. With the Series E 50mm lens, in M mode - manually set f/5.6, 1/160, camera set ISO 800
(#2 & 3 only worked in M mode.)
I had expected that since the Series E lenses were basically FX lenses that (based on the feedback on got here on my earlier question) the Prime 35mm lens would have an equivalent focal length of ~50mm and thus the object in the picture would be the same size as the one taken with the 18-55mm lens @ 50mm. But to my surprise it was 2/3 the size. The object size in the picture taken with the Prime 50mm lens was the same as the 18-55mm lens @ 50mm.
Now I am confused. See the attachments. ???
1. With my 18-55mm lens set at ~50mm, in A mode - f/5.6, 1/160, ISO 800
2. With the Series E 35mm lens, in M mode - manually set f/5.6, 1/160, camera set ISO 800
3. With the Series E 50mm lens, in M mode - manually set f/5.6, 1/160, camera set ISO 800
(#2 & 3 only worked in M mode.)
I had expected that since the Series E lenses were basically FX lenses that (based on the feedback on got here on my earlier question) the Prime 35mm lens would have an equivalent focal length of ~50mm and thus the object in the picture would be the same size as the one taken with the 18-55mm lens @ 50mm. But to my surprise it was 2/3 the size. The object size in the picture taken with the Prime 50mm lens was the same as the 18-55mm lens @ 50mm.
Now I am confused. See the attachments. ???
Jan 22, 2018 14:08:34 #
Thanks to all that have replied and for clarifying the effective focal lengths. I was turned around on that initially thinking the 35 & 50 would be 23 & 35 respectively. But I now understand. I should have mentioned that my DSLR is a Nikon D7500. It will be fun experimenting to see if and how this will work. Thanks.
Jan 22, 2018 13:32:06 #
I have a Nikon DSLR with two kit lenses (18-55 f/3.5-5.6 & 70-300 f/4.5-6.3). I also have two Nikon Series E lenses that were used on a Nikon FM film camera. Both of those have a lower maximum f stop (35mm f/2.5, 50mmf/1.8) and might be good for low light situations. Can I use those on my DSLR? I realize I would have to focus manually, set aperture manually (both of those on the lens), and also meter manually for setting shutter speed (on the camera). Also since my DSLR is a 1.5x sensor I know that the effective focal lengths of the two prime lenses would be 23mm & 35mm respectively. Would this would work? And what mode on the DSLR (A, S, M) would I use? Any advice would be helpful. Thanks.