Quote:
Originally Posted by Joshua Bunn
To use them on my canon Eos, i need an adapter with an optical element in them to achieve infinity focus
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Joshua, that depends on which camera the lens currently has a fitting for.
Here is a page that lists flange focal distances for various lens systems. You'll see the Canon EF system has an FFD of 44.00mm and if the lens is currently fitted to a system with an FFD longer than that, your adapter won't need an optical element.
For example if your lens is made for a Pentax K mount, which has an FFD of 45.46mm, then you have 1.46mm to play with.
Being a Tokina lens it probably already has an adapter on it to suit whatever it already mates to. You may be able to take this off and then you'll have more space for a non-optical adapter to EF.
Cheers,
Jason.