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Helix - both through Dob and binos

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#1 PeterDob

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Posted 25 August 2013 - 12:49 PM

Hello all! Awaiting clear and moon-free skies I reworked these two old drawings of the Helix nebula. They were both made during the same night and I hope they offer a nice comparison between an 18" Dob and the Nexus 100 bino's.

Cheers,

Peter

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#2 PeterDob

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Posted 25 August 2013 - 12:49 PM

And here's the Nexus 100 version:

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#3 frank5817

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Posted 25 August 2013 - 06:54 PM

Peter,

This is a wonderful comparison of the two instruments on the same target. With the 18 inch more than 20, 100 mm telescopes you have a big aperture difference. But isn't it wonderful with a modest size instrument and a good sky you can see so much.
Great sketching is your trademark.

Frank :)

#4 azure1961p

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Posted 25 August 2013 - 08:06 PM

The Nexus reminds me if my 70mm 18x OIII view . Nice pair Pete.

Pete

#5 Jef De Wit

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Posted 26 August 2013 - 02:51 AM

I find the difference between the two not so big as I espected!

#6 PeterDob

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Posted 26 August 2013 - 03:56 AM

Thanks guys! The difference was quite significant, meaning that I had to use a lot more averted vision in the bino's. My Dob was also slightly impaired because this drawing was made before I cut my truss poles and therefore I had to use the OCA, with some light loss. But obviously the bino's have 24x, the Dob 76x. So three times as much and still a lot brighter...

Peter

#7 Special Ed

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Posted 26 August 2013 - 05:07 AM

Peter,

I like seeing the two views--there's a big difference. The rendering of the Dob view is terrific, especially the way the nebula trails off to the south.

#8 Asbytec

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Posted 26 August 2013 - 06:16 AM

Nice obs and sketches, Peter. :)

#9 niteskystargazer

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Posted 26 August 2013 - 08:55 AM

Peter,

Nice sketch of the Helix :).

CS,KLU,

:thanx:,

Tom

#10 PeterDob

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Posted 26 August 2013 - 09:58 AM

Thanks, Ed, Norme and Tom! ;)

Peter

#11 Susan H

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Posted 26 August 2013 - 10:21 PM

Very nice, Peter. Well done. Thanks for sharing.

#12 kauf

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Posted 26 August 2013 - 11:24 PM

my helix.....

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#13 Andrev

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Posted 26 August 2013 - 11:58 PM

Peter.

Incredible sketch my friend. Really impressive once again.

Andre.

#14 Scanning4Comets

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Posted 27 August 2013 - 01:50 AM

The second version is the one I see with my 10" scope in darker skies away from home, only in my scope it is bigger.

Nice sketches! :bow:

#15 PeterDob

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Posted 27 August 2013 - 03:57 AM

Thank you very much, Susan, Kauf, André and Markus!

@Kauf: I already spotted your painting in your post. Very nice!

@Markus: A pair of 100mm binoculars match about a 6" to 8" reflector, so it should not be too far off of your 10". But as you said, you see it bigger with more or less the same brightness, so that more or less works out. :)

Peter






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