Help me find an adapter for this?

[mike_wahl]

Hey all its been a little while since I posted...

I recently acquired a practically unused Canon Vivitar 400mm f1:5.6 telephoto lens from a friend and was curious what kind of adapter I would need to make it fit on my Rebel XT. Thanks!

[mike_wahl]

Im not sure what kind of mount it is to begin with either, I believe it may be the FD mount.... correct me if im wrong.

[DDCSD]

Maybe post a picture of it?

[mike_wahl]

alright one sec

[mike_wahl]

http://i11.photobucket.com/albums/a187/fighting_the_world/IMG_1795.jpg
http://i11.photobucket.com/albums/a187/fighting_the_world/IMG_1798.jpg
http://i11.photobucket.com/albums/a187/fighting_the_world/IMG_1800.jpg
http://i11.photobucket.com/albums/a187/fighting_the_world/IMG_1801.jpg

[foxbat]

http://www.flickr.com/photos/theowl84/2209042204/

[mike_wahl]

that doesnt really explain what i need to get... do i need an adapter and a teleconverter? kinda lost on this one lol.

[Jon]

That actually looks like a T Mount lens with Canon FD adapter. Those unscrew, and there is an EOS T-Mount available you can replace the FD mount with. Strictly manual operation, though.

[mike_wahl]

there is a metal ring that unscrews off of it... do you have a link to a t-mount adapter?

[msowsun]

That is a FD "Preset" lens. It doesn't have the regular FD mount levers for setting auto aperture:
http://upload.wikimedia.org/wikipedia/commons/thumb/9/90/Canon_FD_lens_rear.jpg/180px-Canon_FD_lens_rear.jpg

You can get any FD to EOS adapter but I don't think it will be able to focus to infinity. You will also have to do "stop down metering". No big deal, especially with a digital.

I have never used one but I think you would select your shutter speed in manual mode. You compose the shot wide open, then manually set the lens to the desired aperture (not the camera), and the viewfinder will darken. Then hit the shutter.

[mike_wahl]

On the 'present' lenses does the metal ring unscrew? This one the ring unscrews and underneath it is basically just a threaded mount with the red dot on it which leads me to think jon was right about it being an adapter.

[mike_wahl]

http://www.adorama.com/LNTMEOS.html?sid=12133632861294919

This looks like it would almost certainly fit the lens

[msowsun]

I guess you can unscrew the FD mount and screw on a EOS T-mount Here is a link to a similar lens with a listing of the various T-mount adapters available. With the T-mount, can you get infinity focus on an EOS camera?
http://porters.com/Merchant2/merchant.mvc?Screen=PROD&Product_Code=090465&Category_Code=L1G&Product_Count=0

[mike_wahl]

I just ordered the adorama t-mount adapter, so I will let everyone know how it works once it gets here. Thanks for the help!

[Madweasel]

It certainly should work, and will allow infinity focus. That's the arrangement on my Tokina 800mm.

[rwong2k]

post some pix taken with this lens afterwards =)

[mike_wahl]

^^^ I shall! Im looking forward to doing some landscape photos and in September me and my girlfriend are heading to Myrtle Beach for ten days so I cant wait to get some get shots of the beach and ocean.

[Wilt]

Replace theT-mount FD adapter with an T-mount EF adapter and it would focus at infinity. The T-mount was a way to make a single lens usable on a wide variety of lens mount bodies.

As was posted, open aperture, focus lens, close aperture to the preset amount, let the camera choose shutter speed (or set it yourself), shoot.

[mike_wahl]

The T mount is on its way!

When everyone says 'open aperture first' you mean use a low number aperture to begin with, focus the camera, then set the aperture to the same number as the lens displays correct?

[Wilt]

The T mount is on its way!

When everyone says 'open aperture first' you mean use a low number aperture to begin with, focus the camera, then set the aperture to the same number as the lens displays correct?

A preset lens has two fundamental controls for aperture, the first one presets the desired shooting aperture, and the second closes the diaphram down to the preset aperture -- that's why it is called a 'preset' lens!

So you would aim and focus with the second control set so the diaphram is fully open, then set the second control to close down the diaphram to the preset aperture for making the exposure.

Yes, 'open aperture' is using a small f/number (e.g. f/2) which is a 'large aperture' (a big opening in the diaphram). 'closed aperture' is using a larger f/number (e.g. f/22) which is a 'small aperture' (smaller opening in the diaphram)

[mike_wahl]

Ill have to take another look at the lens because I don't really recall seeing two sets of aperture controls.

[Jon]

One won't be marked with an aperture scale. It may have a couple of index marks, or an arrow, to tip you off; other than that, it's just a ring that you twist all the way one way or the other.

[mike_wahl]

Well I got it today but my camera does not display what aperture I am using. I can adjust it but the numbers stay locked at 00...

I did take a few pics and so far the clarity is pretty good, just need to fine tune

[Jon]

It won't - you'll have to take the aperture value from the lens if you want to know it. But if you meter stopped-down in Av or M modes, you'll get a correct exposure even with the aperture displaying oo. Obviously, Tv won't work.

[Wilt]

Before EOS came along, the only information passes between lens and body was via the mechanical linkage...which obviously does not exist in an EOS body! Similarly the generic preset lens lacks the metal contacts to provide information electronically, so the body cannot tell what aperture nor can the body command the aperture to close down at time of exposure.