Prime focus on Skywatcher 200P with a filter

[szymon]

I've been looking at options to add a Light Pollution filter into the optical chain between my Canon 6D and my Skywatcher 200P Explorer at prime focus.  This it turns out is quite hard, because the Camera needs to be quite close to the OTA so I can't just put in a long tube with the filter on the end of it.  I was wondering if anyone else had looked at this problem and solved it without using the very expensive clip filters from astronomik (I don't like that solution because each and every filter is very expensive, I want a general mechanism where I can swap in various reasonably priced filters).

In particular, has anyone tried any of the following:

1. http://www.teleskop-express.de/shop/product_info.php/info/p3504_TS-Adaptor-from-M48--2--filter-thread--to-T2---low-profile.html

2. http://www.teleskop-express.de/shop/product_info.php/info/p6127_TS-Adaptor-from-2--to-Canon-EOS-Bayonet-with-full-aperture.html

3. http://www.telescope.com/Astrophotography/Camera-Adapters-T-Rings/Orion-2-Zero-Profile-Prime-Focus-Camera-Adapter/c/4/sc/62/p/102119.uts

4. http://agenaastro.com/lumicon-low-profile-2-prime-focus-adapter-la1080.html

5. http://agenaastro.com/blue-fireball-m48-female-t-t2-male-adapter-t-06.html

Any personal experience before I go ahead and order would be much appreciated :-)

-simon

[Tinker1947]

You would normally use a Coma Corrector with a Newt, the filter would screw into the CC....????

[FunkyKoval35]

I have the same problem. Next week I am going to buy Baader MCCP Mark III coma corector witch have to be 55mm from surface of the chip(Canon 350D). So, the question is how to make it all work if i have sharp image on the sensor when the focuser(2" Crayford) is pulled up about 15mm? Is it any way to set it properly?

[dph1nm]

One of these, and just screw a T2 threaded filter into the end?

https://www.altairastro.com/product.php?productid=16714

NigelM

[Tinker1947]

The sensor distance on a DSLR with a T-Ring is set to 55mm, all you do is screw the CC into the T-Ring, the 2" flange on the CC fits the Focuser....this won't work on a 1.25" focuser.....

[Tinker1947]

One of these, and just screw a T2 threaded filter into the end?

https://www.altairastro.com/product.php?productid=16714

NigelM

If your imagine with a Newt you will get bad Coma around the edge, it really does need a Coma Corrector....

[szymon]

If your imagine with a Newt you will get bad Coma around the edge, it really does need a Coma Corrector....

You would normally use a Coma Corrector with a Newt, the filter would screw into the CC....????

I've heard about Coma, but right now I'm just trying to get an inexpensive solution to mount the LP filter.

One of these, and just screw a T2 threaded filter into the end?

https://www.altairastro.com/product.php?productid=16714

I assume that the whole thing including the filter will just go into the 2" focusser -- thanks, that looks just about perfect, and it's in the UK!