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09/15/2008 03:43:17 PM · #1 |
I'm guessing that chances are slim anyone might have a solution for this one, but ya never know!
My teleconverter for my Sigma 70-200mm f/2.8 EX APO IF HSM for Nikon is not fitting as tightly as it should, and it's causing some bad behavior at times. I can wiggle the lens back and forth just enough that in certain positions it's not making proper contact, and it'll misfire with weird, inappropriate settings in the process.
This has been an issue for me at the last couple football games I've shot (and that's really the only time I use the teleconverter). I'll shoot several good shots in a series, but then if I'm zooming while shooting, it's easy to get things misaligned and I'll get some wonky shots mixed in.
Anyone have a good way of tightening the connection between the teleconverter and the lens, and possibly the teleconverter and camera (I'm not sure which end of the TC is having the issues)? I eventually gave up on the teleconverter last night at the Steelers/Browns game, just sticking with the regular reach of the lens.
Message edited by author 2008-09-15 15:44:40. |
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09/15/2008 08:52:31 PM · #2 |
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09/15/2008 10:08:45 PM · #3 |
Sounds like either a loose mounting ring(check all the screws) or you have worn out the mount tangs(the three tabs that lock into the camera) if they are plastic. you could try glueing a very thin strip of foil over the tangs on the mount to snug things up a little or you might be able to swap them out for steel replacements from Ebay(use some of those M42 adapters and have them machined to match the one on the lense/TC). Also check that your contact mounts(the bit that holds the little gold contacts) are solid as they are screwed into the side of the mount normally.
Do you have some pictures of the TC front and back and the rear of the lense? Can you see where the movement is taking place in good light say from below?
Try sticking a piece of scotch tape on the compass points of the flat mounting face on the camera(where the lense twists on) and on the TC. Do it one at a time and see if either snugs things up, that will at least point you to the problem joint.
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09/15/2008 10:12:20 PM · #4 |
The easiest fix for that is to just buy yourself a 300F2.8 and then toss the 70-200 on a second body and carry them both. As far as fixing the loose fitting, you need to determine if its the TC or the lens. Can you attach another lens to the tc and see if its the concern or if its the back of the lens? Check all the mounting screws for both mount areas as well.
Matt
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09/15/2008 10:36:20 PM · #5 |
I believe that everyone else has covered it pretty well. The redneck way to fix it would be to put a bunji cord from the lens shade around the body and back to the shade : )
You may try cleaning the contacts with a pencil eraser if all else fails. I suspect loose screws though. Be sure to check it out carefully for physical strength after any repair. It would be a big bummer if the converter or lens mount screws let go and dropped the lens.
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09/15/2008 11:00:32 PM · #6 |
Originally posted by MelonMusketeer:
I believe that everyone else has covered it pretty well. The redneck way to fix it would be to put a bunji cord from the lens shade around the body and back to the shade : )
You may try cleaning the contacts with a pencil eraser if all else fails. I suspect loose screws though. Be sure to check it out carefully for physical strength after any repair. It would be a big bummer if the converter or lens mount screws let go and dropped the lens. |
Actually since its a Sigma lens, and I'm sure Alan has insurance, it might be a blessing in disguise if it did. :D
Matt
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