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02-02-2007, 08:45 AM   #1
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This lens worth repairing?

I have a Vivitar Series 1 28-105 f/2.8-3.8 that's in great shape except that the diaphram doesn't stop down. It's stuck at wide open.

I think it's a pretty good lens that I would like to use on my (brand new) K100D, but do you think it's worth having repaired?

If so, does anyone have suggestions on where to send it?

02-02-2007, 09:12 AM   #2
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This? But in a Pentax mount. Most bench fees start at about $80US. Diagnostics precede that charge and run about $125.US. Maybe if you got a friend...
02-02-2007, 10:06 AM   #3
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i think you can get another off ebay cheaper than you can buy. i got that same lens but as a kiron this week for $36usd delivered. the glass was hazy and he had listed it as clear so he refunded the 36 and i got to keep the lens. seems to be a fairly sharp lens.
http://www.texasbostons.com/kiron1.jpg
http://www.texasbostons.com/kiron2.jpg
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02-02-2007, 08:25 PM   #4
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That problem can be caused by oil on the blades. If you can get the rear mounting area open and use a cotton swab with Butane lighter fluid or acetone on it and wipe the blades you may be surprised at how well they suddenly work.

A little check around the net and you will find how to's and tools needed and so on. If it is the sharp lens mentioned above and is clean and bright in every other respect it may be worth the fun.

02-03-2007, 01:50 PM   #5
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Thanks

Thanks for the advice. I'm starting to disassemble it now. Looks like I'll need to find some smaller phillips head screwdrivers before I can get much further, though.
02-03-2007, 03:44 PM   #6
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actually they are not phillips. they are a flat X driver to my understanding. small phillips will work but take care no to strip them.
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