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Lens not recognized by Camera

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oldschool View Drop Down
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Post Options Post Options   Quote oldschool Quote  Post ReplyReply Direct Link To This Post Posted: 24 May 2019 at 15:57
To all who replied,
I am inclined to think it is a power issue for the DT lenses. I will try a few more fixes but must move on. My Sigma and 3 minolta screw drive lenses work fine and they are my go to's anyway. I will just get another body, and then see about a repair. I will be posting a few images soon of the Sigma 500 APO, which is proving to be quite a good lens. I am getting the camera settings tweaked better for more consistent focus and exposure.
Thanks for all the replies.
oldschool
 



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jvandegr View Drop Down
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Post Options Post Options   Quote jvandegr Quote  Post ReplyReply Direct Link To This Post Posted: 24 May 2019 at 19:11
Over the years, I've used DeOxIt to clean camera body and lens contacts on Nikon, Leica, and Sony systems. Nine times out of ten, it fixes problems like these. As you might know, invisible surface corrosion and the accumulation of very small particles can cause communication issues between the sender and receiver. I use a makeup applicator tip to apply a very small amount on both the camera and lens contacts - don't spray them directly. Last I checked, you could purchase a couple small spray bottles at RadioShack for around $20 and I would guess they're available online as well. Good luck and keep us updated.
Jon Van de Grift
Geographer and Documentary Photographer
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stiuskr View Drop Down
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Post Options Post Options   Quote stiuskr Quote  Post ReplyReply Direct Link To This Post Posted: 24 May 2019 at 20:30
For cleaning contacts you can't beat a fiber pen, also recommended for feathering paint chip edges before you use touch up paint on a car.

https://www.amazon.com/Scratch-Brush-Fiberglass-Colors-vary/dp/B0019V18D2
Rob Suits Jr.
a99M2 a99 a77 a700 KM7D|Min24/2.8 Min35/2 So50/1.4 So50/2.8 Min85/1.4G Tam90/2.8 Tam180/3.5|Tam17-50 CZ24-70G2 KM28-75D So70-200G1 So70-300G So70-400G1| SonyF60 AD200R2
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jvandegr View Drop Down
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Post Options Post Options   Quote jvandegr Quote  Post ReplyReply Direct Link To This Post Posted: 24 May 2019 at 21:12
Originally posted by stiuskr stiuskr wrote:

For cleaning contacts you can't beat a fiber pen, also recommended for feathering paint chip edges before you use touch up paint on a car.

https://www.amazon.com/Scratch-Brush-Fiberglass-Colors-vary/dp/B0019V18D2


I strongly recommend not using this tool on camera contacts because the strands break off over time, which can end up on your sensor or elsewhere inside the camera / lens. Otherwise, it's a good tool for less sensitive applications.
Jon Van de Grift
Geographer and Documentary Photographer
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mirthseeker View Drop Down
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Post Options Post Options   Quote mirthseeker Quote  Post ReplyReply Direct Link To This Post Posted: 25 May 2019 at 08:42
Originally posted by oldschool oldschool wrote:

To all who replied,
I am inclined to think it is a power issue for the DT lenses. I will try a few more fixes but must move on. My Sigma and 3 minolta screw drive lenses work fine and they are my go to's anyway. I will just get another body, and then see about a repair. I will be posting a few images soon of the Sigma 500 APO, which is proving to be quite a good lens. I am getting the camera settings tweaked better for more consistent focus and exposure.
Thanks for all the replies.
oldschool


This discussion on dpreview A-Mount Forum also covers the power issues you experience (if it is not a contacts problem - check that one or more of the contacts are not out of position when cleaning them). Note that replacing the SSM fuse (surface mounted on the main board) appears to be a much cheaper option than replacing the whole board, if you can find a technician who will do it (& if that fuse is the only problem).
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