| Author |
Message |
    
CJ
Rating: N/A
Votes: 0 (Vote!) | | Posted on Tuesday, January 10, 2006 - 07:24 pm: | 
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I just received an older, used Tokina 17mm f/3.5 wide angle lens which I'd recently ordered.
I've attached it to my Nikon EL2, as well as my F, I notice the same phonomenon: DOF preview only works to stop the aperture down when the focus is set to between 2 3/4" and infinity. If the lens is focused any closer, pressing the DOF preview button has absolutely no effect at all.
Is this lens defective, or is this a 'feature'?
Thanks,
-CJ |
CJ
Rating: N/A
Votes: 0 (Vote!) | | Posted on Tuesday, January 10, 2006 - 07:26 pm: |
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Whoops..clarification: I should have been 2' 3/4", NOT 2 3/4". |
Glenn Middleton
Rating: N/A
Votes: 0 (Vote!) | | Posted on Tuesday, January 10, 2006 - 08:27 pm: |
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I am not really familiar with the stop down mechanism on the Nikons mentioned. However I would suggest that if DOF preview does not work when lens is close focused, then the aperture will also not function when the shutter is released. I think the aperture operating lever in the lens is separating from the external linkage as the lens becomes fully extended.
Check the working of the aperture with the camera set on B. However I think a removal of the mount may be required to find out what is either loose or worn. |
CJ
Rating: N/A
Votes: 0 (Vote!) | | Posted on Tuesday, January 10, 2006 - 08:43 pm: |
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Thank you Glenn. And you're right:
I tried the lens with the camera set to bulb and the back open. I get the same thing: The aperture is wide open, even if the lens is set to f/5.6-f/16. Weird. |
rick oleson
Rating: N/A
Votes: 0 (Vote!) | | Posted on Wednesday, January 11, 2006 - 10:15 am: |
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i think glenn is onto it... as the lens racks out, it's running past the end of the aperture linkage. my guess is that someone has had it apart and got it back together wrong. |
Glenn Middleton
Rating: N/A
Votes: 0 (Vote!) | | Posted on Wednesday, January 11, 2006 - 10:47 am: |
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I have this lens in its Canon FD reincarnation, and I had the mount off quite easily. The mechanism was very similar to the genuine Canon setup. Do not know if this information is of any help to you. If you are familiar with the Nikon mechanism and your lens copies the genuine lens, perhaps you will be able to work out what has got misplaced/broken.
However as you have just purchased the lens, perhaps you should send it back for repair. |
CJ
Rating: N/A
Votes: 0 (Vote!) | | Posted on Wednesday, January 18, 2006 - 02:50 pm: |
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Thank you all for the comments & suggestions. I'm sending it back--swapping it for another one.
From what I've read online, this lens seems like a decent wide-angle.
Cheers! |
Glenn Middleton
Rating: N/A
Votes: 0 (Vote!) | | Posted on Wednesday, January 18, 2006 - 05:25 pm: |
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Yes the lens is optically very good. The one I have is surprisingly good at max aperture. |
William Tarnes
Rating: N/A
Votes: 0 (Vote!) | | Posted on Tuesday, January 24, 2006 - 09:46 am: |
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It's a moderately good lens per photodo: http://www.photodo.com/prod/lens/detail/ToAT-XAF17_35-844.shtml . Not really a Nikkor 18/3.5 or 20/2.8, but not as expensive, either. |
