Re: [APML] Coma corrected SCT Part 2

[Duncan Munro <dmunro@sfu.ca>]

Here's another image taken from the ASV in Arizona:

M22, 30 minutes at F10 (aprox 2500mm EFL) with Fuji Superia X-tra 400ISO.

http://www.sfu.ca/%7Edmunro/m22_2_30min_f10.jpg

the one hour lab kinda messed up the neg and i haven't had time to clean 
it up.

I did several shots with neg film but my E-200 shots are still at the lab.

cheers

http://www.sfu.ca/~dmunro

Duncan

http://www.sfu.ca/~dmunro

 

Duncan Munro wrote:

> 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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>>>
>>
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