was_a_guru
Senior Member
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. I wanted to see if these would work on my D7500. 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).
So I experimented. With my camera on a tripod took four shots (all at same distance from subject):
1. With my 18-55mm lens set at ~35mm, in A mode - f/5.6, 1/160, ISO 800
2. With my 18-55mm lens set at ~50mm, in A mode - f/5.6, 1/160, ISO 800
3. With the Series E 35mm lens, in M mode - manually set f/5.6, 1/160, camera set ISO 800
4. 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 the prime 35mm lens would act like a focal length of ~50mm and the prime 50mm lens would act like a focal length of 75mm on a DX camera.
BUT the object size and angle of view of the picture taken with the Prime 35mm lens was identical to that of the 18-55mm lens @35mm. And the same for the pictures of the Prime 50mm and the 18-55 @50mm. Shouldn't the pictures taken with the prime lenses have shown a different sized image (telephoto-ish) comparatively to the DX images respectively?
So I experimented. With my camera on a tripod took four shots (all at same distance from subject):
1. With my 18-55mm lens set at ~35mm, in A mode - f/5.6, 1/160, ISO 800
2. With my 18-55mm lens set at ~50mm, in A mode - f/5.6, 1/160, ISO 800
3. With the Series E 35mm lens, in M mode - manually set f/5.6, 1/160, camera set ISO 800
4. 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 the prime 35mm lens would act like a focal length of ~50mm and the prime 50mm lens would act like a focal length of 75mm on a DX camera.
BUT the object size and angle of view of the picture taken with the Prime 35mm lens was identical to that of the 18-55mm lens @35mm. And the same for the pictures of the Prime 50mm and the 18-55 @50mm. Shouldn't the pictures taken with the prime lenses have shown a different sized image (telephoto-ish) comparatively to the DX images respectively?