Sigma-300mm zoom I have a used Sigma 75-300 for my Sony a200. It only works in manual mode Why . In all other mode I keep getting a reading ( No Len attached Shutter is locked, All but manual. hope you can help.
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The problem you are encountering is with the screw head interface between the lens and the camera body. They just are not locking together properly. Sounds like you need to send her in for repair.
You need to turn the mode dial to Manual (M). You won't be able to use the camera's built-in exposure meter at all with this lens. You can take an exposure reading with another lens to use as a starting point, then review the pictures and histograms to fine-tune the exposure.
That lens is not an AFS type lens. The D40x camera only uses AFS compatible lenses. You could still mount and use it in M, but it will never give you autofocus or TTL flash.
Every lens made after 1996 with AF is made for that particular body. Hence the reason many small camera stores when bust, carrying a huge inventory for the 6 or 8 different cameras out there.
Your Sigma 28-300mm doesn't have a HSM-motor as far as i know. When you switch it from MF to AF, you also have to disengage the manual focusing ring by pulling it towards the camera, or pushing it away from the camera. Using the AF without unlocking the manual focusing ring may damage the AF motor.
I hope this helps,
/Chris
(From Sigma lens literature) Capable of macro photography, this
lens has a 1:2 maximum close-up magnification at the 300 mm focal
length. It's the ideal high performance lens for portraits, sports
photography, nature photography, and other types of photography that
frequently use the telephoto range. It also has a switch for changeover
to macro photography at focal lengths between 200mm and 300mm with a
maximum close-up magnification from 1:2.9 to 1:2. The minimum focusing
distance is 1.5m / 59 in. at all zoom settings.
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