Query about T mount adaptors

[buckas]

Hi all, looking to get an adaptor to do some prime focus photography

looking at these two I believe they're the same thing but just double checking with you knowledgable people

So shall i get this:

First Light Optics - FLO 2-inch T mount camera adapter

or this :

First Light Optics - William Optics 2 inch prime Focus Camera Adaptor

will also need a t-ring

cheers

drew

[Mike73]

What doers the adapter actually do? Sorry for the thick question.

[LukeSkywatcher]

Are you looking to attach your camera to your scope?

What camera and what scope?

[brantuk]

The first one adds only 4mm to the optical train - the second adds around 4-5cm. Make sure you get the correct length for your requirements. They have a t-thread so you can attach a dslr t-ring to it. Chip position relative to the focal plane is important as can be "out focus" and "in focus"

[eddy]

What doers the adapter actually do? Sorry for the thick question.

Its the piece that fits into the focuser on your scope

[boabsta]

Do you need an adapter? My t-ring screws into my barlow and works a treat. You dont have to use it at x2 as you can remove the element so theres no magnification.

[brantuk]

Some barlows have a t-thread so you can attach a t-ring and dslr - some don't. Also some focus tubes have a t-thread at the end for direct attachment of a dslr using only a t-ring. The adaptor is not allways necessary, but in a lot of cases it is. All depends on how your are configuring your optical train

[buckas]

Are you looking to attach your camera to your scope?

What camera and what scope?

Yes

I have a 5D Mark II / 7D and a SW 200pds

thanks

drew

[Tinker1947]

My Reflector with a T-Ring and Adapter add about 10mm to the distance camera face to focus tube, when camera if focused the tube sticks out about 10mm, you want to start thin and if required buy a extention tube, you may find its not required. This the T-ring and Adapter on the Camera...

[buckas]

So after all that what shall I get?

T ring for eos is obvious but which t mount tube?

What ones do other people use with 200pds?

Cheers

Drew