Quantaray makes lenses with a variety of mounts. If the lens has a Pentax mount then it will fit onto your camera. If it has a Canon mount, for example, then it will not.
SOURCE: Pentax Ist DL auto focus not working anymore after using Quantaray AF LD 70-300MM Lens
It seems to be a connection issue between the Lens and the Camera body. Perhaps the mount is not true to the body Ask Pentax about this their Technical Support Team
SOURCE: AV error whn pentax ist DL & Quantaray zoom lens attached
I've got the same problem. The problem is that the lense is loosely attached to the body. What you need to do is that when you see the Av flashing, press the lense of the camera to the body and twist the lense to the left a bit. This tightens the connection. You can then take the photo.
SOURCE: AV flashing in LCD of camera whn zoom attached
Also check that your diaphragm ring on the Zoom lens is set to the "A" position.
SOURCE: Using a 500mm fixed aperture lens on a Pentax ist
Use "exposure compensation" (the button with a plus/minus symbol). It allows you to lighten (toward the + side) or darken (toward the - side).
Hi,
The lens pins either broke or maybe out of position and not moving the lens..
Here is a tip that I wrote about How to get a Digital Camera Lens to work again
Steps to Repair a Digital Camera Lens
heatman101
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