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06-21-2010, 12:14 PM   #1
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aperture problem 300mm f4 Takumar

I was fortunate to come across a 300mm f4 Takumar with a nice Tiffen 82mm 1A Skylight filter. It has clean glass, smooth focusing, good detents on the aperture click stops but has a problem: the aperture blades do not stop down in either auto or manual mode. So right now I just have a nice f4 fixed aperture lens. It would cost more to get the lens repaired than it would to buy one on Ebay so I don't know what to do. Any suggestions?

06-21-2010, 12:57 PM   #2
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do the aperture blades move when you press the lever with your hand?
06-22-2010, 04:43 AM   #3
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unfortunately ther is no movement no matter what I do. the aperture remains wide open.
06-22-2010, 04:58 AM   #4
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Are you sure the lever is clicked into place? Some of them can be quite stubborn.

06-22-2010, 01:27 PM   #5

Join Date: Feb 2009
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Sometimes the manual mode lever is broken. To check the diaphragm without the manual lever, try moving the small black pin at the rear of the lens. Set the aperture ring to any aperture except f/4, then move the pin in its slot to see it the diaphragm moves. If no movement is seen, the problem is more serious than the manual lever or black pin actuator. If the diaphragm does move, then there is problem with the manual mode lever.
06-22-2010, 04:40 PM   #6
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The aperture blades do not move when I set the aperture not equal to f4 and slide the pin all the way over. So it is serious. At least I have a fixed f4 lens as it takes good pics wide open. Thanks for trying.

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