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Astrophotography and Sketching >> Sketching

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Andrev
Post Laureate
*****

Reged: 02/08/11

Loc: Montreal, Quebec, Canada
October 18th sun new
      #5477592 - 10/18/12 07:14 PM

Hi.

Finally a clear day. I've been able to do two sketches at 300X before the seeing degrade drastically.

Andre.









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JeanB
Pooh-Bah


Reged: 07/11/11

Loc: Montreal, Canada
Re: October 18th sun new [Re: Andrev]
      #5477707 - 10/18/12 08:45 PM

Terrific sketches André! You have all my admiration for the details and time you put in your work!

Jean


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Ibmelrod
sage


Reged: 10/18/04

Loc: Ontario Canada
Re: October 18th sun new [Re: JeanB]
      #5477958 - 10/18/12 11:14 PM

Wonderful work Andre.

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frank5817
Postmaster
*****

Reged: 06/13/06

Loc: Illinois
Re: October 18th sun new [Re: Ibmelrod]
      #5478196 - 10/19/12 02:34 AM

Andre,

Four excellent sketches.

Frank


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Andrev
Post Laureate
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Reged: 02/08/11

Loc: Montreal, Quebec, Canada
Re: October 18th sun new [Re: frank5817]
      #5478338 - 10/19/12 07:38 AM

Thank you so much guys. Its very appreciated and encourage me to continue.

I did some tests yesterday and I have to adjust my stencils because the circle representing the eyepiece's FOV is much larger when looking at the eyepiece than the one I have on my 8" 1/2 X 11" sheet of paper. So the drawing area on my sheet is smaller than the actual image even at 50º FOV and certainly worst if I use a 82º FOV eyepiece.

Thanks.

Andre.

Edited by Andrev (10/19/12 08:18 AM)


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niteskystargazer
Carpal Tunnel
*****

Reged: 10/05/09

Loc: 41-43'-28" N 87-42'-39" W
Re: October 18th sun new [Re: Andrev]
      #5478986 - 10/19/12 03:04 PM

Andre,

Very good sketches of the Sun .

CS,KLU,

,

Tom


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Special Ed
Postmaster
*****

Reged: 05/18/03

Loc: Greenbrier Co., WV 38N, 80W
Re: October 18th sun new [Re: niteskystargazer]
      #5480574 - 10/20/12 03:13 PM

Andre,

Very well done. You get some remarkably good views with your scope/eyepiece setup. 152mm of aperture is probably close to optimal for solar observing.

One suggestion--you might want to take note of how much of a curve you're giving the solar limb in your closeup drawings. The tendency is to put more curve than is actually there.


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Andrev
Post Laureate
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Reged: 02/08/11

Loc: Montreal, Quebec, Canada
Re: October 18th sun new [Re: Special Ed]
      #5483313 - 10/22/12 09:54 AM

Thank you TOM.

Michael.

I'm not sure to get your point ? You find the closeup curve is too much ? Certainly it represent what I see in the eyepiece actually. I have to redo my stencils of those with less magnification.

Andre.


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Special Ed
Postmaster
*****

Reged: 05/18/03

Loc: Greenbrier Co., WV 38N, 80W
Re: October 18th sun new [Re: Andrev]
      #5486520 - 10/24/12 06:13 AM

Yes, either the curve is a little too much or the prom a little too tall in relation to the limb curve. Usually the tendency is to make the proms bigger than they actually are in full or almost full disk sketches or make the curve a little too pronounced in closeups.

I know you are trying to render a realistic view. Your drawings are quite good and if the proportions are off at all, it's not by much. I could well be wrong--it's just the way it looks to my eye.


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Andrev
Post Laureate
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Reged: 02/08/11

Loc: Montreal, Quebec, Canada
Re: October 18th sun [Re: Special Ed]
      #5486596 - 10/24/12 07:55 AM

Michael.

Today I'll try new stencils where the curve is less prononced.

Andre.


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