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My rear optic lens came out of its mounting any solutions to re-mount

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Send it back to the manufacturer

Posted on Jun 24, 2014

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Quantaray makes lenses with a variety of lens mounts. Assuming the lens has a Canon EF mount, it will fit onto the T3i just like any Canon lens. If it has a different mount, you'll need an appropriate lens mount adapter.

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At the risk of being obvious, you need a Nikon mount.

The lens comes with a T-mount. This is a "universal" mount with adapters for almost any camera mount, including the Nikon F mount. If the lens doesn't come with one, get a Nikon T-mount adapter.

The lens doesn't have any electronics, so you'll be shooting completely manual. No autofocus, no autoexposure, not even any exposure help from the camera's light meter.

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This is fixed lens camera.
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What is the difference between ae1 and eos 50 i have ae1 lens and they they do not fit the eos 50 as i was led to believe paul.


Whoever led you to believe that is wrong. The AE-1 uses the Canon FD mount, while the newer EOS cameras use the EF mount.

Canon introduced the EOS (Electro-Optical System) in 1987. The bayonet-style EF lens mount is at the heart of the EOS camera system. Breaking compatibility with the earlier breech-lock FD mount, it was designed with no mechanical linkages between moving parts in the lens and in the camera. The aperture and focus are controlled via electrical contacts, with motors in the lens itself.

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Where can i buy a Sigma 70-300mm f/4-5.6 DL Macro AF Lens mount adapter for a canonEOS 500D


You can't, not as far as I know.

Getting functionally useful adaptors from any other brand to Canon EOS is difficult as the register distance from the sensor to the lens is the deepest of all current lens mounts. Adaptors therefore require expensive optical correction in order to preserve infinity focus ability and given that the adapted lens will still be substantially crippled most owners aren't prepared to pay for such an adaptor. In any case, the additional optical elements will reduce optical quality.

Due to similar electronics, it is possible to physically convert a Sigma mount lens to EOS by fitting an EOS lens bayonet but it's a skilled job requiring fabrication skills and even then there's no guarantee that the lens will communicate correctly with all EOS bodies. In practice, due to the scarcity of Sigma mount lenses the conversion is usually the other way around.

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How do I mount the 500mm mirror lens filter(s) on my new Rokinon lens?


The 30.5mm rear filters fit in the rear of the lens. If you remove the T-mount adapter, you should see the threads which take the filter.

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1 Answer

How to mount Minolta AF 28-80/3.5-5.6 on pentax


Unfortunately, it is not possible to mount Minolta lenses on a Pentax K mount camera and retain either auto-focus, metering, or the ability to focus at infinity.
The reason for the loss of the ability to focus at infinity is because the distance from the mount to where the image forms on a Minolat lens is 43mm, whereas on a Pentax it is 46mm, so the Minolta lens glass would need to be 2mm into the body of the Pentax camera in order for the image to form on the sensor (i.e. have a clear image that is in focus).
The only solution to this is to purchase an adapter with an optical element such as this: http://photo-adapter-llc.amazonwebstore.com/Zykkor-Minolta-MD-Lens-to-Pentax/M/B004PB8142.htm?traffic_src=froogle&utm_medium=CSE&utm_source=froogle This will allow you to focus at infinity, however you will have to use stop down metering and manual focus, as the electrical contacts will not connect. Also, you can expect a slight loss of image quality when using an adapter.
I personally have a few Minolta lenses that I have wanted to use on my Pentax, so I understand your pain. It is a shame they don't work better.
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EF-S 17-85mm will not auto focus on fuul zoom my other lenses work ok so must be this lens ? it keeps on trying but most time ends up out of focus


A dirty filter or smudges/marks on the optics, especially the rear element can cause focus issues. Cleaning the pins contacts on the mount of the lens can be a simple solution too. Beyond that, circuit replacement is the next likely step.

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1 Answer

Blurry picture


You need to clean the projector lens on the optical engine using a soft cotton or, better yet, a chamois cloth. Also clean the mirror mounted inside the rear cabinet and also the front and rear of the screen itself.
If picture is still blurred then your the optical engine is most probably defective.

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Lens canon 28-135 IS


Need to open Lens?

1. Front Lens Cap- press the two side taps in and pull out.
Rear Lens Cap- twist and pull out.

2. Remove and Repair: Small Phillip Screwdrivers, gloves and mask.

From the rear, the electrical contacts- remove all those
screws. Some screws are locked with clue. Pinch black
plastic ring that is part of those contacts and gently remove out.
Don't brake the electrical contact ribbon cable.

Good lock.
atdlee@netzero.com
at

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