Re: [APML] Coma corrected SCT Part 2

[Duncan Munro <dmunro@sfu.ca>]

I'll be posting some coma corrected test images taken through a 10" f10 
SCT shortly. Using a MPCC, I appear to be getting round stars right to 
the extreme edges of the FOV. This is very encouraging! Finally, an SCT 
with a well corrected FOV...

check out this image in particular:

http://www.sfu.ca/%7Edmunro/m13_2_F10_MPCC_20min_208xt_EQ6.JPG


I haven't had a chance to take some comparison images without the CC but 
I do think it makes a difference.

The MPCC does vignette to some degree but I suspect most of it is due to 
the T-ring.


cheers

Duncan





Duncan Munro wrote:

> Ok, I've got a rough web page finished with some images:
>
> http://www.sfu.ca/%7Edmunro/Coma%20corrector%20test%20page.html
>
> cheers
>
> Duncan
>
>
> Duncan Munro wrote:
>
>> Hi all. I've finally had a chance to do some more testing with CCs 
>> and SCTs. I tried out my Baader MPCC last night. It's a definite 
>> improvement over the Lumicon CC. I'll be posting some sample images 
>> on my website shortly. With the MPCC and a 10" F6.3 OTA I get a coma 
>> free field about 30mm in diameter. The Lumicon could manage about 
>> 20mm. Again, I'm guessing that either CC would produce a coma free 
>> field over a full 35mm frame with an SCT @ F10, which is tempting.
>>
>> BTW, my Meade 208xt produced excellent results with my 10" F6.3 OTA, 
>> Lumicon NEG, and EQ-6 Skyscan GEM. I was a bit worried about guiding 
>> on the uncorrected stars at the edge of the FOV but the 208xt had no 
>> problems.
>>
>> cheers
>>
>> Duncan Munro
>>
>> http://www.sfu.ca/~dmunro/
>>
>>
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