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05-26-2010, 03:31 PM   #1
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K7: Focus problem at infinity (Vivitar Series 1 70-210 F3.5)

Hi,

I have a small problem with my Vivitar Series 1 70-210 F3.5 (Tokina) lens focusing at objects more than 30 meters away . It seem like the lens can't focus at infinity. Is there a way to fix this problem ?

Regards
Peter

05-26-2010, 04:33 PM   #2
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I'm moving this to the lens forum as it seems to a lens issue, not a camera one.
05-26-2010, 09:34 PM   #3
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Vivitars have a large range of adjustment for infinity focus. It's possible that the lens could just be readjusted and work properly. Unfortunately I have the previous Kiron version, and the only reference for infinity focus I've seen is for a Komine version. You might have to figure it out on your own. The most common adjustment is to move the front element or group slightly, so try to figure out how that element is mounted. A lot of manufacturers hide the mounting hardware under the trim ring around the front element. Sometimes there's screws on the lens barrel.
05-27-2010, 02:34 PM   #4
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Thank you for the hint. I will see if I can figure out how to dismantle this lens. But I will need to invest in a very small screwdriver. If the front element is moved closer to the first group, I think the problem could be solved.

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