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Can the AT130EDT do full-frame?

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#1 LPA

LPA

    Vostok 1

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Posted 21 March 2020 - 07:35 PM

I wasn't sure if my AT130EDT could illuminate the full-frame sensor in my ASI6200MM-Pro, but I wanted to give it a try. To accomplish this I replaced the stock 2" focuser with a 2.5" FeatherTouch and replaced the AT FF/FR for this scope with the APM-Riccardi Apo-Reducer 0.75 x M63. The threads on this reducer match the drawtube threads on the FT so all I needed was a spacer that would bring the total back-focus to the recommended 73.5mm for a 130mm f/7 scope. For this test run I had to make do with a 48mm spacer that brought the camera close (75mm) to that BF while attaching to the EFW and ASI6200. I'm ordering a proper 63mm spacer that will connect directly to the 54mm threads on the EFW. Clouds rolled in late so I wasn't able to get all of the data I'd hope to obtain, but since this was just proof of concept, I processed what I was able to obtain last night: 24x150sec blue, 24x150sec green, 10x240sec Ha, 30x120sec lum, and 24x150sec red along with bias, darks, and flats. The pixel size with this scope and camera combo is 1.14"/pixel so they seem like a good match. Here is a down-sized version of the full image after fairly basic processing in PI:

 

M81-82_LRGB_Hac1small.jpg

 

The field of view here is 180'x120'.

 

Here is a cropped version that emphasizes M81, M82, and NGC 3077:

 

M81-82_LRGB_Hac1_croppedsmall.jpg

 

Note: the full size of this image is 5000x4000 pixels. The ASI6200 provides lots of room for creative cropping. Next is a further cropping that just shows M81 and M82:

 

M81-82_LRGB_Hac1_cropped1small.jpg

 

The full size of this image is 3200x2560 pixels.

 

The Riccardi reducer worked great, giving round stars at the corners. The flat frames showed slight light dropoff at the corners but that was easily dealt with during calibration. I'm very pleased with how this turned out and I can give a definite yes answer to my question. I'm looking forward to getting lots of use with this combo.

 

Larry


Edited by LPA, 22 March 2020 - 07:50 AM.

  • zjc26138, havasman, Thomas Marshall and 2 others like this

#2 Garyth64

Garyth64

    Aurora

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Posted 21 March 2020 - 08:05 PM

Thanks for posting those pictures.  I don't do photography, but I do have a AT130EDT, too.

 

I've told some friends that it shows some great visual images.

 

Your photos prove that to be true.




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