Faulty aperture Nikon 300mm f4 AFS?

<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>

 

<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>

<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>

<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>

<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>

<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>

<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>

<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>