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GavStar

Night vision with a 16 inch dob

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My favourite scope to use with my night vision monoculars is I think my C11 which has given me some fantastic views with a 0.75x reducer and 55mm plossl (effective system speed f3.3).

However, I had a dose of aperture fever last year and ordered a 16 inch goto dob manufactured by sky vision in France.

It turned up late last year and as it was my first dob I was a bit shocked by the size and bulk of it.

I had a couple of goes with it but struggled with the coma corrector spacing (I had the Es one) and was a bit disappointed with the nv views it gave since the edge stars were not great.

The scope got mothballed for a few months.

Then events happened which enabled me to take it to my dark sky site for further testing. I purchased a Televue paracorr which increases the f ratio of the scope a little but enabled me to be more confident about getting the coma corrector working properly.

I set the scope up carefully following the paracorr instructions and with an ethos in non nv mode the views looked good across the field of view. However once I moved to the nv monoculars and 41mm panoptic the star shapes at the edge weren’t great. I was disappointed. I checked the paracorr instructions and I’d done everything right. I checked the collimation again and it was a bit out. After adjusting and redoing collimation twice I eventually got decent stars with the panoptic.

Are nv monoculars more sensitive to non-accurate collimation than normal glass eyepieces?? I think using the night vision monoculars in afocal mode with an eyepiece does impact the edge of the fov to some extent.

Anyway after a few hitches with the goto setup I eventually got everything working well. By this time it was getting very late so I only managed a few objects in Cygnus.  But they looked rather nice - a step up in resolution to my c11 phone images I think and the visual views are also noticeably better.

Here are phone images of the Pac-man, eastern veil and crescent nebula.

 

I’m now looking forward to using this scope again despite it taking materially longer for me to setup compared to the c11.

A93C53C7-3025-473F-9A48-90008C388B1A.jpeg

F61A51BD-6588-4F11-9D47-51D4FCB6A3BE.jpeg

9C4FCE60-7328-4C66-8BB1-3B95E044DF8A.jpeg

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Nice images Gavin, glad you are getting to grips with the dob now. Particularly like the Pacman.

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Nice views. Out of curiosity which night vision monocular do you use?

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Very impressive Gav, worth persevering for sure. Would be interesting to see a comparison of the same objects with your other scopes?

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Just wow.  I love the idea of this thing more and more every time I see more pictures that you have taken.  And that is after playing with your NV and already being very impressed with it.

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31 minutes ago, RobertI said:

Very impressive Gav, worth persevering for sure. Would be interesting to see a comparison of the same objects with your other scopes?

Robert, 

Here’s some comparison Pac-Man shots (85mm Tak, 130mm AP and the 16 inch dob)

DBF6190C-5490-4683-8458-9239F3D504B4.thumb.jpeg.b067ee7911142e3edce4d265ee8139ad.jpeg

 

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1A1276AE-D0C2-4800-910C-2DCC77BC6A7B.thumb.jpeg.1f282f01b6f02db0f5def2e3d8ba9345.jpeg

A comparison with the Veil (Tak 85, tv85, c11, 16 inch dob)

A7A7F416-B6E0-4300-A181-937A1B8E9D15.thumb.jpeg.a8b657329118c6fb40744a92c04248e4.jpeg

 

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A crescent comparison (Tak 85, c11, 16 dob)

CF951976-BA1A-4BEB-8F7F-EAD7CC0F7B44.thumb.jpeg.c5d5fe6c38c704d9519eb5c93a1d005a.jpeg

10E488C7-3E8D-440B-93EC-18D3CE082FB7.thumb.jpeg.8ac83220e934b397f8090fea7f0dffa1.jpeg

 

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Yes, excellent comparisons, really shows the different merits of small scope for wider field and large aperture for more detailed views.

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Very nice, now need to find some smaller Sharpless to poke the 16” at. Sounds like we could have more NV users in the U.K. sometime.... put one on Santa’s list and be good!!

 

peter

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