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lens aperture blades not opening / closing
I got a Minolta / Rokkor PG 58mm f1.2 lens the other day, shipped from eBay. The aperture blades were opening / closing fine at first, as I tested it, but after several times, they were stuck at the wide open position..

What kind of places should I look for to see if they can fix this? Is it something that can be resolved by cleaning? I'm in Rochester, NY, so I'm not sure how to find lens repair shops around here...

Comments (9)

If the lens aperature is electronically actuated as opposed to mechanically, try cleaning the contacts..

Minolta should be able to repair the lens or recommend an authorized repair center. I would consider contacting them...

Comment #1

This is an old film lens, 35mm format...so the aperture is manually controlled....

See the Rokkor files review of it here (the 58mm f1.2, not 50mm f1.2).

Http://www.rokkorfiles.com/Battle%20of%2050s1.htm..

Comment #2

I had a hunch it probably was but thought I would throw the electronic part out just in case. The manufacturer may also be able to 'tune' the lens to your camera. This was a suggestion given to me by a Nikon rep for a situation I was having...

Comment #3

Friscovoyager wrote:.

I had a hunch it probably was but thought I would throw theelectronic part out just in case. The manufacturer may also be ableto 'tune' the lens to your camera. This was a suggestion given to meby a Nikon rep for a situation I was having..

Thanks...I've called Sony (now owner of Minolta lens department), and they referred me to Precision Camera Repair in Enfield, Connecticut. I couldn't find repair information for that exact lens on their website, but the 50mm f/1.4 costs $124 to repair...

Comment #4

David J Heinrich wrote:.

I got a Minolta / Rokkor PG 58mm f1.2 lens the other day, shippedfrom eBay. The aperture blades were opening / closing fine at first,as I tested it, but after several times, they were stuck at the wideopen position..

What kind of places should I look for to see if they can fix this? Isit something that can be resolved by cleaning? I'm in Rochester, NY,so I'm not sure how to find lens repair shops around here..

I had a Nikon 20mm f2.8 whose blades got stuck wide open..

It turned out that lubricant (grease / oil) from inside the lens had gotten onto the aperture blades and made them stick together..

This may have been caused by my storing the lens near to a hot radiator or however but perhaps the lens getting too hot causing the lubricant to flow..

Anyhow I found a place here (London) who fixed the lens for 60 and fixed it in such a way that the problem was not likely to recur..

Mark_A..

Comment #5

David J Heinrich wrote:.

This is an old film lens, 35mm format...so the aperture is manuallycontrolled....

See the Rokkor files review of it here (the 58mm f1.2, not 50mm f1.2).

Http://www.rokkorfiles.com/Battle%20of%2050s1.htm.

This is a relatively well known and recurring problem with Rokkor lenses..

With my first ever camera (Minolta SR1) I had to have the diaphragm blades re-lubricated every now and again. Not overly expensive, but a nuisance and -as you never knew it was about to happen- a loss of images (overexposed) as the diaphragm wouldn't close down to the required aperture but stick somewhere between full open and closed down, and you wouldn't notice until the prints came back from the processor..

This is the one thing that has made me very wary of ever buying another Minolta camera (although I do currently still own a different 3; a 160c P&S, a Himatic 7s RF, and a Maxxum 500si)..

Just part of the price of owning a Rokkor lens, I guess...

Comment #6

Mikelis wrote:.

With my first ever camera (Minolta SR1) I had to have the diaphragmblades re-lubricated every now and again. Not overly expensive, buta nuisance and -as you never knew it was about to happen- a loss ofimages (overexposed) as the diaphragm wouldn't close down to therequired aperture but stick somewhere between full open and closeddown, and you wouldn't notice until the prints came back from theprocessor..

Where do you take the lens to have the blades cleaned and relubricated? I've called a few camera shops around, and they don't do it; one guy said, "it's not economical to repair those 35mm-format film lenses anymore, no-one has the parts for them"..

I called Sony, and they said that Precision Camera is an authorized repair center for old Minolta lenses; however, they have a flat-rate fee of $125 - $275 or so depending on what lens you want to have repaired...

Comment #7

Anyone know what kind of place to look for to get the aperture blades cleaned locally? How to find such a place? Mikelis said when he had it done it wasn't too expensive.....

Comment #8

David J Heinrich wrote:.

Anyone know what kind of place to look for to get the aperture bladescleaned locally? How to find such a place? Mikelis said when he hadit done it wasn't too expensive....

All I did was to take it into my local camera shop which sent it to their "regular" repairman.:-).

Of course, that was some time ago, and maybe guys like him are not so easily found where you live, though we still seem have enough to go around over here (in Oz)...

Comment #9

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This question was taken from a support group/message board and re-posted here so others can learn from it.

 

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