Pentax Ist DL auto focus not working anymore after using Quantaray AF LD 70-300MM Lens
I borrowed a Pentax mount Quantaray AF LD 70-300mm Tele Lens from a friend of mine and it worked fine, including the autofocus, but when I removed the lens I put my original 18-55 that came with the camera the auto focus stopped working! I tried switching back to the Quantaray only to find out the auto focus no longer worked with it either. The interesting part is that my friend experienced the same problem after using the Quantaray, but thought it was just his camera. Any suggestions? I did upgrade the firmware to 1.03, but this didn't help and also reset the settings without any joy.
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Quantaray makes their lenses with a variety of camera mounts. A lens with a Nikon mount, for example, will not work on a Canon body. As long as you get the lens with a Canon mount, it will work with the 5D MKII.
It will default to manual through the viewing screen. It will only work on automatic, using the viewfinder. Make sure you also set the focal length (lens to shutter distance). You might also have a mf / af switch on the lens. This also only works through the viewfinder.
Depending on how new your Minolta SLR film camera was, the lens may or may not work on a Minolta Digital SLR. In many cases, a lens with the correct mount (in this case, a Minolta mount) can be used on the same brand of camera in the digital format.
One thing you should know is that DSLR sensors are, generally speaking, smaller than the size of a 35mm film negative. Long story short, that means that your lens will have a magnification factor on the DSLR. Usually, it is in the range of 150%, so a 70-300 lens from a film camera would cover 105 to 450 on a Digital SLR.
To be sure about the mount, you'll need to seek advice specific to Minoltas -- probably best to take your lens to a local camera shop and see for sure if it fits and what features will work (aperature, auto-focus, etc) and which won't work on the DSLR.