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How to fix Zoom Creep. Minolta 70-210 3.5-4.5

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IMATRYIN View Drop Down
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Post Options Post Options   Quote IMATRYIN Quote  Post ReplyReply Direct Link To This Post Topic: How to fix Zoom Creep. Minolta 70-210 3.5-4.5
    Posted: 22 February 2010 at 19:29
I have a Minolta 70-210 f3.5-4.5 and I was asked if it had zoom creep. I hadn't tested this lens for that as I never really used this lens for anything other than shooting in an horizontal position. So When I was asked whether or not it had it, I found out it did and immediately went to work on how to repair it. I found a site on a Nikon lens where they had used a rubber wrist band to put over the seem between the zoom ring and the lens barrel. I wanted something that I could do without having to find a rubber band that would work properly. So here is what I did: Near the rear of the lens where the zoom ring and the barrel come together ther is a smal gap. I took some thread, I'm sure embroidery floss, dental floss (Probably non-waxed), and a variety of other very small diameter strings would work just fine too, and wrapped a couple turns of it into that gap and tied it into a knot. This string being in that gap provides just enough resistance to hold the lens in place while allowing the zoom ring to still be turned with little effort. It is also very hidden and hardly shows at all. This has stopped the lens from creeping at all and took all of 30 seconds to perform. I'm sure this fix could be applied to many different lenses.    

Here are a couple pictures.

Before:

[/IMG]

During:

[/IMG]

...and After:

[/IMG]
 



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MAS View Drop Down
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Post Options Post Options   Quote MAS Quote  Post ReplyReply Direct Link To This Post Posted: 22 February 2010 at 19:52
hmm that's almost a fix I would try but what happens when the string is worn out and bits of it end up deeper in the lens...
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Post Options Post Options   Quote p_man Quote  Post ReplyReply Direct Link To This Post Posted: 22 February 2010 at 19:53
Any idea how to fix zoom creep on a push-pull type zoom?
p_man
a200 | Sony 18-70 kit | Min50/f1.7 | Minolta 70-210/f4 | Promaster100-400/f4.5-6.7 | Sigma EF-530 DG ST
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IMATRYIN View Drop Down
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Post Options Post Options   Quote IMATRYIN Quote  Post ReplyReply Direct Link To This Post Posted: 22 February 2010 at 20:00
hmm that's almost a fix I would try but what happens when the string is worn out and bits of it end up deeper in the lens...


Literally it takes 30 seconds to perform so if you are worried about the string wearing out, which I agree could happen, just change the string ever so often before it wears out. I'm sure there are threads, such as Rayon or silk that would last a very long time. Also there are a couple more ideas, like using one of those rubber wrist bands or just a band of elastic to cross the gap and provide friction. This was just what I had available at the time and it seems to work great.   
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Post Options Post Options   Quote dorian-grey Quote  Post ReplyReply Direct Link To This Post Posted: 22 February 2010 at 20:01
How about fishing line?
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Post Options Post Options   Quote OniFactor Quote  Post ReplyReply Direct Link To This Post Posted: 22 February 2010 at 20:07
Originally posted by p_man p_man wrote:

Any idea how to fix zoom creep on a push-pull type zoom?


find one of those thick rubber bands used on produce and lobster claws. put it over the joint for the zoom.
Cam Lewis
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p_man View Drop Down
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Post Options Post Options   Quote p_man Quote  Post ReplyReply Direct Link To This Post Posted: 22 February 2010 at 20:13
Do you mean to use it like a cheap zoom lock? I'm guessing I couldn't leave it in place while I'm changing focal length.
p_man
a200 | Sony 18-70 kit | Min50/f1.7 | Minolta 70-210/f4 | Promaster100-400/f4.5-6.7 | Sigma EF-530 DG ST
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Post Options Post Options   Quote MAS Quote  Post ReplyReply Direct Link To This Post Posted: 22 February 2010 at 20:23
well you could try a more wear resistant material thats for sure. but i would think that the string would like to roll more inside as you turn the ring and you can't get hold of it...

i don't know if this is a good place but i have a lens tokina SD 35-200 af 4-5,5 with almost 2 mm of play on the spot where you placed the string. the lens doesn't have zoom creep at all but it's just loose on that spot. I've searched in loads of places but never found anything about it, since it's good lens IMO i'd like to save it
www.maxartstudio.nl

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Post Options Post Options   Quote OniFactor Quote  Post ReplyReply Direct Link To This Post Posted: 22 February 2010 at 20:34
for zooming out it should be okay, might have to slide it onto the outside barrel when zooming in, though..
Cam Lewis
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Post Options Post Options   Quote p_man Quote  Post ReplyReply Direct Link To This Post Posted: 22 February 2010 at 20:45
I'll give it a try, I don't mind the creep when I'm shooting handheld, but I was trying to get a shot of the moon on a tripod, and it kept creeping in from 400 to about 220 or so.
p_man
a200 | Sony 18-70 kit | Min50/f1.7 | Minolta 70-210/f4 | Promaster100-400/f4.5-6.7 | Sigma EF-530 DG ST
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Post Options Post Options   Quote Rno. Quote  Post ReplyReply Direct Link To This Post Posted: 01 June 2010 at 03:57
Imatryin,
I just saw your post and thought this could be the answer to my 16-80's zoom creep. But unfortunately, the zoom ring is so precisely engineered and fitted that there is not a hair room at either end to squeeze something in or under. I just wish all that precision were good for something...

I think the only way for me is to find a rubber band just tight enough to go half over the forward edge of the zoom ring and the adjacent barrel. Something clear would even be better, so I can see the FL scale.
Ungeeking
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twm47099 View Drop Down
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Post Options Post Options   Quote twm47099 Quote  Post ReplyReply Direct Link To This Post Posted: 01 June 2010 at 16:13
What I've done on a couple of lenses takes longer than the string method, but looks good and works. I bought some black elastic used for sewing clothes. I used both 1.5 and 2 inch wide depending on which fits on the lens where the zoom ring meets the barrel.

I wrap the elastic around where the zoom ring and barrel meet and measure the length with a little overlap. It doesn't take much stretch to tighten the zoom and too tight will make it difficult to turn. Then I sew (or have a friend sew) both ends of the over lap and slide it over the lens.

Using this on my 70-210 f/3.5-4.5 the lens won't creep even with a cokin filter holder. CP filter, and lens hood mounted. My Sigma 135-400 also had a lot of lens creep, and using it with a large homemade hood and CP filter only made it worse. This method stopped any creep. The black elastic looks like it was designed for the lens, and it costs only a dollar or so.

tom

Edited by twm47099 - 01 June 2010 at 16:13
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Post Options Post Options   Quote Shercando Quote  Post ReplyReply Direct Link To This Post Posted: 01 June 2010 at 16:17
Smack the outer barrel until it's out of round. That'll work
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Post Options Post Options   Quote bharnois Quote  Post ReplyReply Direct Link To This Post Posted: 01 June 2010 at 17:25
Originally posted by Shercando Shercando wrote:

Smack the outer barrel until it's out of round. That'll work


But then you end up with a 70 or 210 prime! Darn, I hate when that happens.
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