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Old Jan 29, 2013, 3:05 PM   #1
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Default Is there a reliable adaptor for this lens to Canon t2i?

I have a Tamron 70/300 lens, brand new, but it's Nikon fit.

I have bought an adaptor which supposedly would allow me to fit Nikon lenses to the t2i; when I tried it with the Tamron I did not get on very well.

I was lucky in the end to be able to get the adaptor out of the camera without any damage - it looked for 15 minutes that I was in real trouble.

Can anyone suggest how I can successfully marry these two up, please?

I am not too bothered about autofocus issues.
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Old Jan 29, 2013, 3:35 PM   #2
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Your best bet is to sell/return the lens and get one that fits.

There are some adapters that will make a physical connection, but not an electronic/logical one, so your T2i may not be able to meter with or even adjust the aperture of your lens, and AF is out of the question.

Nikon AI Adapter for Canon EOS Rebel XTi 650D 600D 500D 400D 350D 30D

Nikon AI Lens Adapter for Canon EOS System AF Confirm
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Old Jan 29, 2013, 10:47 PM   #3
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I have 2 Nikon F to Canon EOS adapters. One is a plain mechanical adapter and the other one has an electrical contact circuit board on the bottom to give you focus confirmation. This one will give you a beep and a green light in the viewfinder when the subject is in focus. Of course for manual focus lenses, you can change the aperture on the lens and you just set it to Aperture Priority on the mode dial and the camera will take care of the rest.

However, if your Tamron lens is an AF lens which has no diaphragm control or f-stop setting, such adapter is not going to work very well. You will need one which has a diaphragm control so you can arbitrary set the f-stop. Without it, the lens will be wide opened. In other words, you only have one f-stop to use for your shooting.
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Old Jan 30, 2013, 7:26 AM   #4
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Thanks for the informative replies, but I fear I did not properly phrase the question.

I am not interested in aperture control or focus. I will be using this setup for astro photography and exposures and focus will be computer controlled, totally unconnected to the camera internal software.

I am just looking for an adapter that will properly allow me to fit/unfit the Tamron lens, Nikon fit, to the t2i.
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Old Jan 30, 2013, 8:40 AM   #5
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Do not most of these cross brand adapters also act as a short extender tube mounting the lens just a bit forward of where it would normally be?

If so then focus at infinity would no longer be possible.


As for adapters this one should work for most non-g lenses
http://www.bhphotovideo.com/c/produc...t_Adapter.html

and this is the version for G series lenses
http://www.bhphotovideo.com/c/produc...apter_for.html

The price of that adapter is more than some of the 70-300 lenses sell for.
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Old Jan 30, 2013, 11:25 AM   #6
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Quote:
Originally Posted by PeterP View Post
Do not most of these cross brand adapters also act as a short extender tube mounting the lens just a bit forward of where it would normally be?

If so then focus at infinity would no longer be possible.
The Canon EF Mount has a flange-to-focal-plane distance of 44mm, while the Nikon F Mount has a flange-to-focal-plane distance of 46.5mm. An adapter to mate a Nikon lens to a Canon body needs to be no more than 2.5mm thick in order to preserve Infinity focus.

Conversely, an adapter to mate a Canon lens to a Nikon body would have to be -2.5mm thick in order to preserve Infinity focus. When somebody figures out how to do that, they're going to make a lot of money, and not just from camera buffs.
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