Question about Quantaray Tech-10 70-300mm f/4.0-5.6 for Canon EOS

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Deterioration of internal components or "o" rings

The telephoto slide on my lense is stuck and it appears that some rubber components inside have deteriorated. A coating of gunk has been deposited on the lower surface which I can't seem to clean off.

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I tossed the lens out at the recommendation of a local repair shop.

Posted on Jun 26, 2008

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Telephoto lens stuck

batteries might need charging or try new batteries.

Jul 04, 2014 | Panasonic Pal Version Lumix Dmc-fz47/fz48...

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I have several old,some very old cameras which have due to obviously wrong storage developed fungus inside the lenses. I am a retired engineer, but do not know how to remove the lens front without doing...

This is a tricky job- you have to be able to reassemble not just the lens components but the aperture diaphragm and focusing components. There are lots of little springs that jump out and sometimes tiny loose ball bearings.

But if you feel confident- most front lens elements are held in by a retaining ring that can be unscrewed. On older lenses this is obvious, with a couple of slots in the retaining ring, one one each side. You need some kind of tool to engage these slots without slipping and scratching the glass. I have actually used the points of the blades on a pair of scissors, but this is obviously not to be recommended.

On later lenses, there may appear to be no slots. Usually this means that the actual retaining ring is hidden behind a dummy. If that is the case, and there is no way to be sure but to try, you can unscrew the dummy ring by using friction, with a disk of rubber cut from an old innertube pressed against it, or maybe a rubber glove. This ring does not have to be screwed up very tight, as it is only cosmetic. Sometimes this ring is the outer surface of the front end of the lens housing, and sometimes it is an insert.

Sometimes it is easier to get at the inner surface of the front element by disassembling the lens from the rear, which is usually a matter of removing a lot of tiny screws.

However you get in, you are likely to find that removing the the mold does not clean the lens completely. It will have etched faint lines into the lens coating, and you will also introduce a certain amount of dust, which I have never managed to eliminate entirely.

Oct 20, 2010 | Canon Cameras

1 Answer

My grandpa needs a new part for his vivitar 55mm. I don't know about cameras so my description may not be great but it is a rubber ring around a plastic piece that screws into the lens. We need to find a...

I think you want a lenshood that is 55mm in diameter (the distance across the front of the lens-what we also need to know is about the lense- what is the wrting on the ring around the very front glass lens? Also, if you l ive near a camera store, take the lens in and they can help you.

May 17, 2010 | Vivitar 35x X3 Telephoto Lens For All 55mm...

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Rubber casing of lens gummy;difficult to extend or shorten lens

did the lens get hot (closed in hot car)?- probably melted some of internal lubricant and /or adhesive on rubber rings or caused the rubber ring itself to start to deteriorate

Apr 23, 2010 | Sigma 70-300mm f/4-5.6 DG APO Macro Lens

1 Answer

While focusing at f/8-22, the ring "catches" or snags" on something, internal (mechanical in nature) momentarilythen continues. It sounds "mechanical, metallic"

sounds llike the small bearings in the ring over riding and snagging
Try usng a compressor from the local garage to blow around the mechanism to remove any dirt that may be under the ring. This can cause "sticky bearings

Thanks for using fixya

Sep 23, 2009 | Leica Telephoto 100mm f/2.8 APO Elmarit R...

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I have a Minolta Rokkor-x 200mm telephoto lens with fungus

Lens fungus is really common and it's not cost effective to repair. Even if the fungus is removed then the multicoatings are permanently damaged.

The good news is that until the fungus becomes pretty severe the image quality doesn't suffer much as most photos use the lens stopped down to some extent and this means that if the centre of the lens is clear then there's nothing to block the light paths.

Unfortunately it does tend to spread, so keep affected lenses in a separate camera bag to the rest and if you can afford to do so then throw them away and replace your camera bag as it will be loaded with microscopic spores waiting to attack more lenses. Making sure that your camera and lenses are completely dry and free of condensation before storing them until next used will prevent reoccurence.

Jun 16, 2009 | Cameras

1 Answer

Vivitar series 1,70-210mm tele photo.when camera is tilted,lense will move in or out.drives me nuts

It's called "zoom creep" and not all that uncommon. You can try sliding a sheet of paper or a thin film under the ring to tighten it up, or use tape to hold it in place once you've got what you wanted. I would NOT squirt any liquids inside to unlubricate it.

Feb 28, 2009 | Vivitar Telephoto 100mm f/3.5 Macro Manual...

1 Answer

Problem with Phoenix telephoto lens

Send it in. Don't even think of trying to fix it yourself. Once you start to disassemble the lens, you will find it impossible to reassemble it yourself. Lenses are often designed so that following the order of disassembly in reverse will not work on reassembly. It is allot cheaper to pay for the repair of your problem then to pay to reassemble a collection of parts.

Dec 13, 2008 | Phoenix Gold Telephoto 100mm f/3.5 Macro...

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