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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Posted on Jan 02, 2017

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What size lens do i need for this camera?


You just need any Minolta AF mount lens. Sony Alpha lenses also physically fit as Sony inherited the Minolta lens mount when they bought the company, but as they are a later development not all will be electronically compatible.

The size of the lens depends upon the focal length of the lens and you choose that according to how wide a field of view you desire. Typical lenses are 28 and 35mm wide angles, 50mm "standard" (approximately the same perspective of how the human eyeball sees images), 70 to 90mm short telephoto lenses (a narrower perspective and very good for portraits) and higher numbers are narrower perspective telephoto lenses for viewing increasingly distant objects. In practice, the available lenses will be incorporated into zoom lenses which incorporate a seamless range of focal lengths within one single model. The word "zoom" reflects the fact that you can seamlessly change from say 28mm wide angle through to 80mm short telephoto and every single setting between them

Any zoom which starts at less than 50mm and finishes in the short telephoto range is called a standard zoom and is the lens that most autofocus cameras were supplied with. The next most common size will be something like a 70-200mm which is a telephoto zoom (or tele zoom) and takes you from a portrait lens to a genuine 5x magnification telephoto. You may also find so-called "super zooms" which do the whole job on one, for example 28-200mm. but the more jobs a single lens tries to do, the bigger and bulkier it becomes and the image quality deteriorates due to poorer contrast and greater image distortion at each end of the zoom range.

This is not an exhaustive answer, as there are entire books on the subject, but hopefully it's been of help to you.

Please take a moment to rate my answer or to add a comment if my answer has left you with unanswered questions which need to be resolved before you can rate my reply.

Feb 18, 2011 | Minolta Maxxum 400si 35mm SLR Camera

1 Answer

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...

1 Answer

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...

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

I have an SP 510 UZ digital camera. I have just bought a new telephoto lense, but I can't seem to get the existing lense off the cammera. Help!


Hey john42hockey,
The lens on this camera is not removable. What you need to attach the telephoto lens to your camera is to get a 43-55mm Step-Up Ring, and a CLA-1 lens adapter tube. You should first attach the lens adapter tube to the camera, and then screw the step up ring into the tube and then screw the telephoto lens into step up ring. I have included a link to the manufacturer where you can purchase both the step up ring, and the lens adapter tube incase you need these. I hope this helps!

https://emporium.olympus.com/innards/empProdDetails.asp?sku=200558-410

Sincerely,
Allan
Go Ahead. Use Us.

Jun 20, 2008 | Cameras

2 Answers

Blurry pictures


Just returned from trip to Cuba..most photos taken outside and few inside...all photos were exc. or good except the ones I used with the telephoto feature. Had I left it on the W feature,these photos would have been ok...also make sure the focus ring lens adj. is not on the macro imaging feature..found that focus ring lens setting sometimes moved when I put the camera into its case
Pancho-poppa..

Feb 10, 2008 | Jazz DV-179 Digital Camera

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