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Lens filter problem
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Aug 1, 2021 01:01:06   #
trapper1 Loc: Southside Virginia
 
When I bought my Nikon 18-200 lens I also bought a UV filter and a circular polarizer filter for it. The UV stays on the lens all the time for protection. I have used the CP lens several times and at no time had any problems attaching or removing either filter. I mount them with the CP lens first followed by the UV for protection. Today
I removed the UV but the CP lens would not come off. It would not unscrew, it just revolved as if there were no threads. Then I found it would not tighten up either, not in the least. Now it will neither come off nor seat. If anyone has had a similar experience and solved the problem I would appreciate hearing from you.

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Aug 1, 2021 02:27:00   #
Chicago312 Loc: Western suburb, Chicago
 
Sounds like your CP filter is stuck. You may buy/try a filter wrench, though I never found them to be very effective. If you can’t pry the filter off, consider taking it to your local camera store for assistance.
Not sure what type of filters you bought, but supposedly brass filters are less likely to get stuck - something to consider after you fix your problem.
I also use a UV filter on all of my lenses for protection. However I attach additional filters (CP or ND) to the UV, not to the lens. The UV stays on 24/7.

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Aug 1, 2021 05:14:51   #
MrPhotog
 
Polarizing filters are made so part of the mount (one of two rings) can rotate. That is so you align it to cancel reflections. Try to get a good grip on the thin ring next to the one that rotates. Sometimes you need to grip both rings at the same time.

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Aug 1, 2021 05:22:02   #
drmike99 Loc: New Hampshire
 
trapper1 wrote:
…the CP lens would not come off. It would not unscrew, it just revolved as if there were no threads. Then I found it would not tighten up either, not in the least…Now it will neither come off nor seat. If anyone has had a similar experience and solved the problem I would appreciate hearing from you.


This sounds like the normal free rotation of a properly functioning CP lens.

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Aug 1, 2021 05:22:03   #
Brokenland
 
The CPL have a rotating outer ring which makes these types of filters difficult to remove and if you ever cross thread the filter, you've double the chances of it not coming off the lens etc. You'll have to use a pair of rubber/latex gloves to get a grip on the inner ring. Lesson learn and next time you may have to resort to using a slide in/drop in polarization filter system.

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Aug 1, 2021 05:59:11   #
ClarkJohnson Loc: Fort Myers, FL and Cohasset, MA
 
Stuck filters can be maddening and not logical. Applying extra force is NOT going to be successful. A filter wrench might help. But I have found that a gentle approach often works best. Or, let it sit for a little while and try again. I have had filters that resist furious attempts to remove them suddenly twist off easily.

BTW, I don’t like to stack filters for IQ reasons. If I want to use a CP, I take off the UV.

Good luck!

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Aug 1, 2021 06:42:23   #
Architect1776 Loc: In my mind
 
ClarkJohnson wrote:
Stuck filters can be maddening and not logical. Applying extra force is NOT going to be successful. A filter wrench might help. But I have found that a gentle approach often works best. Or, let it sit for a little while and try again. I have had filters that resist furious attempts to remove them suddenly twist off easily.

BTW, I don’t like to stack filters for IQ reasons. If I want to use a CP, I take off the UV.

Good luck!



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Aug 1, 2021 06:59:59   #
DaveO Loc: Northeast CT
 
ClarkJohnson wrote:
Stuck filters can be maddening and not logical. Applying extra force is NOT going to be successful. A filter wrench might help. But I have found that a gentle approach often works best. Or, let it sit for a little while and try again. I have had filters that resist furious attempts to remove them suddenly twist off easily.

BTW, I don’t like to stack filters for IQ reasons. If I want to use a CP, I take off the UV.

Good luck!



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Aug 1, 2021 07:05:06   #
nikon_jon Loc: Northeast Arkansas
 
Try to find a rubber band that fits snugly around the filter. Put it right next to the lens so you are exerting the energy on the threaded part of the filter and not the rotating part of the filter. A rubber band that is a little wider than normal works best. When you grip it to rotate the filter off, don't squeeze it too hard. Believe it or not, this can tend to distort the metal threaded ring on the filter, thus binding it tighter against the threads on the lens barrel. Wrap your hand around the lens barrel up near the point where the lens and filter connect. This can warm the barrel with your body heat and cause it to expand a little. When you start twisting on the filter, try to exert only enough pressure to keep the rubber band from slipping.

This has worked for me more than once. Filters really need to be taken off frequently and re-mounted to reduce this problem.

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Aug 1, 2021 07:35:16   #
Radioactive Loc: Bellingham
 
DaveO wrote:



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Aug 1, 2021 07:37:18   #
Radioactive Loc: Bellingham
 
ClarkJohnson wrote:
Stuck filters can be maddening and not logical. Applying extra force is NOT going to be successful. A filter wrench might help. But I have found that a gentle approach often works best. Or, let it sit for a little while and try again. I have had filters that resist furious attempts to remove them suddenly twist off easily.

BTW, I don’t like to stack filters for IQ reasons. If I want to use a CP, I take off the UV.

Good luck!



Reply
 
 
Aug 1, 2021 07:38:04   #
Radioactive Loc: Bellingham
 
MrPhotog wrote:
Polarizing filters are made so part of the mount (one of two rings) can rotate. That is so you align it to cancel reflections. Try to get a good grip on the thin ring next to the one that rotates. Sometimes you need to grip both rings at the same time.



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Aug 1, 2021 07:39:16   #
Radioactive Loc: Bellingham
 
nikon_jon wrote:
Try to find a rubber band that fits snugly around the filter. Put it right next to the lens so you are exerting the energy on the threaded part of the filter and not the rotating part of the filter. A rubber band that is a little wider than normal works best. When you grip it to rotate the filter off, don't squeeze it too hard. Believe it or not, this can tend to distort the metal threaded ring on the filter, thus binding it tighter against the threads on the lens barrel. Wrap your hand around the lens barrel up near the point where the lens and filter connect. This can warm the barrel with your body heat and cause it to expand a little. When you start twisting on the filter, try to exert only enough pressure to keep the rubber band from slipping.

This has worked for me more than once. Filters really need to be taken off frequently and re-mounted to reduce this problem.
Try to find a rubber band that fits snugly around ... (show quote)



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Aug 1, 2021 07:46:29   #
Longshadow Loc: Audubon, PA, United States
 
MrPhotog wrote:
Polarizing filters are made so part of the mount (one of two rings) can rotate. That is so you align it to cancel reflections. Try to get a good grip on the thin ring next to the one that rotates. Sometimes you need to grip both rings at the same time.


I'll guess that the UV isn't "stuck" per se, so much as the outer ring of the polarizer is rotating when you try to undo the UV filter. Yo deed to stop it from rotating to unscrew the UV.

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Aug 1, 2021 09:28:49   #
User ID
 
Chicago312 wrote:
Sounds like your CP filter is stuck. You may buy/try a filter wrench, though I never found them to be very effective. If you can’t pry the filter off, consider taking it to your local camera store for assistance.
Not sure what type of filters you bought, but supposedly brass filters are less likely to get stuck - something to consider after you fix your problem.
I also use a UV filter on all of my lenses for protection. However I attach additional filters (CP or ND) to the UV, not to the lens. The UV stays on 24/7.
Sounds like your CP filter is stuck. You may buy/t... (show quote)

It’s not stuck. It turns in place. Do NOT use a wrench.

The threads on the PL have “gone behind” the lens threads. The PL is not rotating on its built in adjustment ring. The entire PL, back ring and all, is rotating in place.

The lens has a nonthreaded gap behind the threaded area. The PL has a nonthreaded gap forward of its threaded area. Just gently pull the PL forward while turning it CCW so that the threads of the PL reengage with the lens threads.

That particular PL is not a good choice for that lens. It needs filters with no nonthreaded area. In comparing threads of the PL to the threads of the UV the difference should be evident.

This problem often occurs with lenses that have plastic filter threads. The threads do not continue all the way to the trim ring, leaving a gap.

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