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Sketching with an Ultrawide field eyepiece

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#1 mitaccio

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Posted 22 January 2013 - 11:29 AM

I am getting ready for tax returns and trying to find the best way to spend my money. I am wanting to sketch all of the Messiers as a personal project, but am concerned with using 82 or 100 degree eyepieces. Having to pan around within the eyepiece to see everything seems like it will pose a major challenge.

What have been the experiences you sketchers have had in using these ultrawide eyepieces?

#2 PeterDob

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Posted 22 January 2013 - 12:49 PM

Well, as you said, it's a major challenge. It's not just the size of the FOV which will give you hours of work, but actually the most difficult thing is to make all of the parts of the FOV match in one coherent whole. In the beginning I used to draw the stars zone by zone. But eventually I noticed that the different parts were not well matched together. So now I use a technique with reference stars and imaginary lines which I've explained in greater detail on my website: www.astronomydrawings.com

I hope this helps...

Peter

#3 mike73

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Posted 22 January 2013 - 01:27 PM

I had a 13mm Ethos and yep it was an amazing EP but just too wide for sketching for the reasons Peter has explained above.

#4 mitaccio

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Posted 22 January 2013 - 04:49 PM

So what are you using then? 68*? 82*?

#5 PeterDob

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Posted 23 January 2013 - 05:07 AM

I'm using a PAIR of 82's... But then again I'm a bit crazy... :D

Peter

#6 Astrojensen

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Posted 23 January 2013 - 05:36 AM

When I have to draw congested starfields, I print out the starfield from Cartes du Ciel, with a magnitude limit matched to the scope used, so that I only print stars to about a magnitude brighter than what I will be able to see. Then I draw the rest at the eyepiece.

But with very wide fields, you'll run the risk that unless the magnification is high, the object will be very tiny on the drawing.

Here's a picture of the M81 galaxy group I did with my WO 72mm f/6 ED at only 21x. The field is 2.5° wide and as you can see, the galaxies are not so large in the sketch as they would appear in the eyepiece.

Posted Image


Clear skies!
Thomas, Denmark

#7 mike73

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Posted 23 January 2013 - 06:42 AM

So what are you using then? 68*? 82*?

I have one low power 82 all the rest are 72/ 70.
Even if I didnt sketch I'd still like to see the field stop when looking through an EP.

#8 Undermidnight

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Posted 23 January 2013 - 08:30 AM

I have found that I have a really hard time sketching with wide field eyepieces. I stick to my orthos to keep the FOV down.

Astrojensen: good idea on printing up the star field!! I make really bad stars :)

Jason

#9 Jef De Wit

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Posted 23 January 2013 - 10:07 AM

I have a set of Naglers (82°), but for sketching I wish I had kept my Plössls. I find it very difficult to sketch when I can't see the (whole) fieldstop. Now I mostly sketch a part of the FOV. For that reason, if I had to buy new EPs, I guess I would buy Delos (72°).

#10 Chopin

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Posted 23 January 2013 - 04:05 PM

I agree that the Naglers are (although incredible) quite difficult to sketch with. I would love to have my old Vixen LVW's again.

#11 John K

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Posted 24 January 2013 - 12:15 AM

I sketch regularly with my 100 deg eyepieces.The key for me to success with them has be to do away with the circle, and feel free to just place the subject and as many field stars as needed to get the feel of it right.






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