Originally posted by TexasTom In the 1980s I bought a Pentax model SFII 35mm film camera. I also bought two zoom lenses: a SMC Pentax F Zoom 35-70 mm & 70-210 mm.
I know that old 35 mm film cameras are almost worthless these days, but a friend said that he thought the zoom lenses might work on a DSLR camera housing. Can anyone confirm?
As others have pointed out, the Pentax F lenses work perfectly well on all Pentax digital SLRs. Please note that the field of view will be smaller, as the digital sensor is only 2/3 the size of a 35mm film frame. Older Pentax lenses will also mount on Pentax digital SLRs but some functionality may be lost (e.g., aperture priority exposure mode is not availabe with type K and M lenses).
Just to correct some mis-information:
All Canon brand EOS lenses work with all Canon EOS cameras, including all digital cameras, with the exception that EF-S lenses are made for the smaller sensor digital models and do not work with full frame cameras. Some older third party lenses have some difficulty with newer cameras due to the fact that the electronics in these lenses is not fully compatible, but the manufacturer may offer to correct this problem for free. Older Canon manual focus lenses (e.g., FD type) are not supported on EOS cameras, AFAIK.
Most Nikon lenses for the F mount will work with the higher end Nikon digital cameras (D1, D2, D3, D100, D200 and D300). The only lenses that won't work are pre-1976 lenses that are not "AI" (Aperture Indexed). However, many older lenses were converted to AI with the replacement of the aperture ring. On compatible bodies, all AI and newer lenses function in all modes supported by the lens, including aperture priority for AI and shutter and program modes for AIS. In this respect, Nikon has the best compatibility with lenses dating back over 30 years. But on lower end digital bodies (D40, D80, etc.) pre-auto-focus lenses will only work in meterless manual mode.
Finally, there are various sorts of adapters to use old lenses with incompatible mounts on various cameras, such as Contax S/Praktica/Pentax M42 screw mount to Pentax K, M42 to Canon EOS, etc. The results will be hit or miss, and generally any automatic aperture function will be lost.