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Old Apr 10, 2006, 9:09 PM   #11
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squirl033 wrote:
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could it have anything to do with the fact the lens doesn't lock up completely tight? as i mentioned above, there's a half-mm or so of rotational play in the lens...
No - The play is caused by the (smaller) locking pin on the camera plunging into the (larger) cavity on the lens!!!

My 100-400L can also be "twitched" - If you add a teleconverter between the lens and the body for example the 'play' is now twice as loose because of two interlocking (smaller)pins/ (larger)cavities...
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Old Apr 10, 2006, 9:30 PM   #12
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thanks, NHL... i just thought it was because there's some play between theflanges on thebody andthe corresponding slots in the lens...i didn't know there were locking pins in there! is there a way to tighten that up, or does it even matter?
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Old Apr 11, 2006, 8:15 AM   #13
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You can see the locking pin on the lens mount goes up and down when you push the lens release button on the body - This pin mates with the hole in the back of the lens mount. The pin is smaller than the hole hence the twisting 'play' when you try to rotate the lens...

The two flanges (lens/body) mate flat against one another and here's where it's important to maintain the flatness to the film(sensor) plane - i.e. can you even insert a thin piece of mylar between lens/body contact surfaces?
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Old Apr 11, 2006, 9:24 AM   #14
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okay, it's becoming clearer now... no, there's zero lateral or vertical play... the lens locks upflat against the body without a problem. it just twists a bit... it sounds like something i can pretty much forget about, though. thanks for the help!! :G
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Old Jul 16, 2006, 12:28 AM   #15
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i live in Marysville and would like to see your sigma 80-400 lens i cant find a store that has them
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Old Jul 16, 2006, 1:53 AM   #16
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flatspin wrote:
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i live in Marysville and would like to see your sigma 80-400 lens i cant find a store that has them
no place around here has them that i know of. i got mine online... if you want to just take a look at one before you buy, perhaps we could meet sometime. i really like the lens. in fact, i used it to take a photo that will be appearing on a CD cover, and also in the October issue of National Geographic... it'sa very good lens,in myopinion.
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Old Jul 16, 2006, 7:14 PM   #17
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great are you close to Marysville
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Old Jul 18, 2006, 8:57 PM   #18
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i live in Kirkland... not real close, but not across the country, either...
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Old Jul 19, 2006, 2:39 AM   #19
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thanks squirl but i rented a nikon 80-400vr from glazers today and now i know i need more lens i think ill go bigma sigma 50-500 all reports on web say its just as sharp
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