anthony_bez Posted April 11, 2010 Share Posted April 11, 2010 <p>Hello,<br> I have just bought a unused Nikon 300mm f4 AFS lens from a private seller. But unfortunately the aperture stops closing after f8, I can select f4, f5.6 and f8.<br> Has anyone had experience of this and likely cost of repair?</p> Link to comment Share on other sites More sharing options...
ShunCheung Posted April 11, 2010 Share Posted April 11, 2010 <p>In the US, Nikon USA would change the entire aperture diaphragm. I had that done on two lenses back in the 1990's, and Nikon USA charged about US$250 each. You are probably looking into something close to 200 Pounds??</p> Link to comment Share on other sites More sharing options...
anthony_bez Posted April 11, 2010 Author Share Posted April 11, 2010 <p>Thank you for the advise Shun.<br> I am waiting for a reply from the seller. I just hope he was not aware of the fault, and it happened in transit?</p> Link to comment Share on other sites More sharing options...
raym Posted April 12, 2010 Share Posted April 12, 2010 <p>Are you sure you have the aperture set to the highest aperture on the lens itself and the little locking tab is in the lock possition?</p> <p>Ray</p> Link to comment Share on other sites More sharing options...
doug herr Posted April 12, 2010 Share Posted April 12, 2010 <p>I don't know if the AFS mechanism is similar to the AF (non-S) mechanism, but I had a similar problem with the 300mm f/4 AF lens. The lever inside the barrell had become disconnected from the aperture blades and the local authorized repair shop wanted US$325 (the standard price for servicing this lens) to fix it.</p> <p>Turns out the lever (remarkably flimsy) was slightly bent & mis-aligned and it took about 15 minutes to figure out the problem and bend the lever back into alignment.</p> Link to comment Share on other sites More sharing options...
anthony_bez Posted April 12, 2010 Author Share Posted April 12, 2010 <blockquote> <p>Are you sure you have the aperture set to the highest aperture on the lens itself and the little locking tab is in the lock possition?</p> </blockquote> <p>The blades are not closing after f8.</p> <blockquote> <p>Turns out the lever (remarkably flimsy) was slightly bent & mis-aligned and it took about 15 minutes to figure out the problem and bend the lever back into alignment.</p> </blockquote> <p>I was hoping it may be a simple fix.. How did you access the lever?</p> <p> </p> Link to comment Share on other sites More sharing options...
doug herr Posted April 13, 2010 Share Posted April 13, 2010 <p>"How did you access the lever?"</p> <p>Remove the tiny screws that hold the rear light baffle in place & remove the baffle.</p> Link to comment Share on other sites More sharing options...
anthony_bez Posted April 14, 2010 Author Share Posted April 14, 2010 <p>Douglas,<br> Thank you for your advise and reply.....<br> I can now see the lever is binding on the light baffle. Hopefully if I bend it back into alignment as you suggested it should solve the problem.<br> I have not attempted the fix yet as I have still not received a reply from the seller.</p> <p>Best Regards<br> Anthony</p> Link to comment Share on other sites More sharing options...
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