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two craters from a low Moon

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#1 Jef De Wit

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Posted 03 March 2010 - 09:40 AM

The Moon was very low in the sky the two last nights. As consequence the seeing was not so good, but still the Moon was a beautiful sight in the telescope.
Crater Langrenus had a lot of detail to offer, even in a small refractor. A pity that I put the central mountains not in "middle" of the crater :(
Crater Hahn showed also nicely his central mountains (this time in the middle!). But I messed up the SW of the crater.
Hope you like it.

Crater Langrenus, 2/3/2010, 22.40-23.20 UT, 16.8 days, 92.6 %, alt 18°, 8 cm refractor @ x138, scanned and mirrored

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#2 Jef De Wit

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Posted 03 March 2010 - 09:41 AM

Crater Hahn, 1/3/2010, 22.10-22.50 UT, 15.8 days, 97.6 %, alt 26°, 8 cm refractor @ x138, scanned and mirrored

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#3 S1mas

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Posted 03 March 2010 - 09:59 AM

I like your technic with moon craters Jef, very original and attractive. Thanks for sharing.

#4 niteskystargazer

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Posted 03 March 2010 - 11:29 AM

Jef,

:waytogo:, nice sketch :)

:thanx:,

Tom

#5 frank5817

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Posted 03 March 2010 - 11:56 AM

Jef,

These are both excellent sketches. :bow: You do a very nice job isolating your craters in your sketches. That is more difficult to do than most would think. :cool:

Frank :)

#6 ladip63

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Posted 03 March 2010 - 12:05 PM

Jeff,
WOW! What an unique way of sketching the craters. :goodjob: :goodjob: :bow:

Lynn

#7 rerun

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Posted 03 March 2010 - 12:34 PM

Hallo Jef,

I like your b/w sketches ,the craters Langrenus and Hahn look great. :bow:

CS

Markus

#8 Jef De Wit

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Posted 03 March 2010 - 01:09 PM

To all, thanks for the kind words.

I struggled a lot with sketching on a black paper with a white pencil. I thinks it works best when the target is at the terminator. The image looks mostly b/w, with not so much albedo features.

When you sketch something farther away from the terminator, you get more albedo differences. I have a hard time to draw those grey-tones with a white Conté pencil. Maybe a normal pencil and white paper is more suited. Or a grey paper. I will try that in the future.

@Frank: Isolating the crater is a matter of limiting the amount of detail to sketch. Otherwise it takes to long.

#9 frank5817

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Posted 03 March 2010 - 11:25 PM

Jef,

What kind of time intervals do you usually spend on a crater sketch?
Have you tried blending in a little bit of black Conte' to get intermediate tones?

I personally do not like to spend more than an hour and a half on a crater sketch and less if on the terminator close to the equator.

Frank :)

#10 mathteacher

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Posted 04 March 2010 - 12:28 AM

Very nice technique!

#11 Jef De Wit

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Posted 04 March 2010 - 10:41 AM

Mathteacher, thanks.

Frank, it takes mostly one hour to finish a moonsketch at the EP. Those two craters took me 40 minutes each.
I tried to blend white Conté to get the intermediate tones, but I'm not satisfied with the result. I never tried black Conté. How can it work on a black paper?

#12 Uwe Pilz

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Posted 04 March 2010 - 01:42 PM

Dear jef,

I like your sketches. Thank you!

#13 Jef De Wit

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Posted 05 March 2010 - 01:15 PM

Uwe, thanks for the kind words.

#14 Kris.

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Posted 06 March 2010 - 12:59 PM

great craters Jef, as Frank says; it's not an easy target!

#15 Jef De Wit

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Posted 08 March 2010 - 05:31 AM

Kris, thanks. Did you already looked at Saturn? Yesterday it was beautiful in the 12" and much "bigger" than Mars :-)

#16 markseibold

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Posted 08 March 2010 - 09:58 AM

Jef

I really like these crater sketches :bow: :bow: :bow:
They look like abstract masterpieces to me! I think you are the Picasso of astronomy sketching! You have developed a unique style.

You know I am not the one for technical accuracy but instead tend to lean toward the art.

Keep those great artistic lunar sketchies coming!

Mark

#17 frank5817

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Posted 09 March 2010 - 12:57 AM

Jef,
You said,
"...
I tried to blend white Conté to get the intermediate tones, but I'm not satisfied with the result. I never tried black Conté. How can it work on a black paper? "

The white does not cover the black very well so you can either put a light touch of black on the paper where you want an intermediate tone and then put a little touch of white on top of that- it will come out grey. Practice on a scrap of black paper or you can touch the black conte' to a white area and use a blending stump. Either way it should work. I never have used grey pastels.

Frank :)

#18 CarlosEH

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Posted 09 March 2010 - 09:39 AM

Jef,

Excellent observations of Hahn and Langrenus. You have recorded the walls and shadows of the craters very nicely. Thank you for sharing them with us all.

Carlos

#19 Jef De Wit

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Posted 09 March 2010 - 01:43 PM

Mark and Carlos, thanks!

Frank, thanks for the explination. I will experiment a little bit with your technique. We will see how it works out.

#20 EddieH

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Posted 10 March 2010 - 04:46 PM

Jef,

Excellent renditions of the two lunar craters.

Eddie

#21 Kris.

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Posted 11 March 2010 - 12:42 PM

Kris, thanks. Did you already looked at Saturn? Yesterday it was beautiful in the 12" and much "bigger" than Mars :-)


yes i have, but seeing was not great on the ninth! couldn't see the cassini division!

#22 Jef De Wit

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Posted 12 March 2010 - 03:28 PM

Thanks Eddie.

@ Kris: I didn't catch the Cassini Division either, but I could see easily between the planet and the ring. Detail on the surface looks even more difficult than Mars :(






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