Hi all there,
I recently bought K-x, my first dslr, along with the da 18-55 kit lens, mostly because of possibility to use "virtualy any Pentax lens ever produced", however, how is it with use of older, 35 mm lenses? I found in manual: The captured area (view angle) will differ between the a and 35 mm SLR cameras even if the same lens is used because the format size for 35 mm film and CMOS sensor are different.
Sizes for 35 mm film and CMOS sensor
35 mm film: 36×24 mm
CMOS sensor: 23.6×15.8 mm
Angles of view being equal, the focal length of a lens used with a 35 mm camera
must be approximately 1.5 times longer than that of a.
Does it mean that "old" 50 mm lens will delivers same as "new" 75 mm? And which focal lenght I should input while mounting manual lens?
Thank's in advance