#1  
Old 23-01-2011, 02:37 PM
Paddy's Avatar
Paddy (Patrick)
Canis Minor

Paddy is offline
 
Join Date: Jun 2007
Location: Strangways, Vic
Posts: 2,208
solar prominence sketches

Here are some trials of sketching solar proms using coloured pencil and black paper. I think I still have to work out how to get the arc of the sun in proportion to the proms. The first sketch is at 66x and show a filament - some ideas about how to do this would be appreciated - and the arc looks at lower mag than the second, done at 46x.

I tried doing the filament by using graphite over the orange pencil, but his just looked shiny. I then went over it with black which helped. As I said, suggestions would be received with gratitude.

Both done through ED80 with 50mm Lunt Ha filter at 0.7 Angstrom
Attached Thumbnails
Click for full-size image (22-1-11 2scaled.JPG)
17.5 KB28 views
Click for full-size image (23-1-11 2scaled.JPG)
10.8 KB21 views
Reply With Quote
  #2  
Old 23-01-2011, 10:36 PM
michaellxv's Avatar
michaellxv (Michael)
Registered User

michaellxv is offline
 
Join Date: Oct 2009
Location: Adelaide, Australia
Posts: 1,577
Hi Patrick.

The coloured pencils on black look very effective, I think you are onto something there. Looks like a very nice sunspot in the first one. Was that intentional?

When placing features I try to image a grid in the EP and then on the paper. Even if only quarters this helps. I do wonder if it would help to do some practice sketches on graph paper until you can do it on a blank sheet.

Another alternative would be a clear sheet with a grid on it which you can use to line things up, but then take away to draw.
Reply With Quote
  #3  
Old 24-01-2011, 08:07 PM
Paddy's Avatar
Paddy (Patrick)
Canis Minor

Paddy is offline
 
Join Date: Jun 2007
Location: Strangways, Vic
Posts: 2,208
Thanks Michael,

It was actually a filament that I was trying to capture. There were a few nice sun spots, but it was so hot I thought I'd just focus on trying to get the proms and filaments right. The challenge with the filament is that it's still orange, but not as bright as the disc. A lot of experimenting yet to get that right.

The idea of practicing on graph paper is a good one. I'll give it a go. Looks like another trip to the stationers.
Reply With Quote
  #4  
Old 24-01-2011, 09:06 PM
desler's Avatar
desler
Registered User

desler is offline
 
Join Date: Jan 2008
Location: Werribee, Australia
Posts: 1,053
Keep it up Patrick, love it!

Darren
Reply With Quote
  #5  
Old 24-01-2011, 09:22 PM
mental4astro's Avatar
mental4astro (Alexander)
kids+wife+scopes=happyman

mental4astro is offline
 
Join Date: Jun 2008
Location: sydney, australia
Posts: 4,633
Paddy, mate, sensational!

Absolutely brilliant work.

The only tip I can give is to keep going. Experience is now your best "teacher". Experience will ultimately give you the touch in handleing the pencils. Just don't smudge. Please. The paper's texture here gives the sketch a certain 'energy of movement'.

If you want, maybe keep sharpening the pencil to maintain its 'edge'. Rolling/rubbing the lead on fine sandpaper reduces the risk of breaking the lead. A black charcoal pencil will give you a non-shiny effect. It is as black as the inside of a cat.

ASOD candidate here, I reckon, .

I'm overjoyed at the result! Really, really good. Keep at it.

I've added a pic of what I've done to an eyepiece to give me a grid pattern. The optic fiber was placed at the EPs focus/field stop, with epoxy glue.
Attached Thumbnails
Click for full-size image (grid field stop pattern 002.jpg)
49.0 KB10 views
Click for full-size image (grid field stop pattern 003.jpg)
194.9 KB7 views
Reply With Quote
  #6  
Old 24-01-2011, 09:29 PM
ballaratdragons's Avatar
ballaratdragons (Ken)
The 'DRAGON MAN'

ballaratdragons is offline
 
Join Date: Jan 2005
Location: In the Dark at Snake Valley, Victoria
Posts: 14,412
Patrick, that is one of the reasons I gave up on using black paper years ago. Very hard to get a soft or faint look.
It is very hard to get shadings right.

I ended up going back to white art paper and lead pencils, then invert in PhotoShop.
Shading is an art form in itself but can be achieved fairly quickly.But you may prefer to work with black paper.
Everyone is different and will eventually discover 'their own way'

I can't see any problem in your sketches above, but I can't compare to the actual image you saw. Only you saw it and know how the sketch should look.

They look good to me
Reply With Quote
  #7  
Old 24-01-2011, 10:20 PM
michaellxv's Avatar
michaellxv (Michael)
Registered User

michaellxv is offline
 
Join Date: Oct 2009
Location: Adelaide, Australia
Posts: 1,577
Quote:
Originally Posted by Paddy View Post
Thanks Michael,

It was actually a filament that I was trying to capture. There were a few nice sun spots, but it was so hot I thought I'd just focus on trying to get the proms and filaments right. The challenge with the filament is that it's still orange, but not as bright as the disc. A lot of experimenting yet to get that right.

The idea of practicing on graph paper is a good one. I'll give it a go. Looks like another trip to the stationers.
I do get my solar terminology mixed up sometimes.
Reply With Quote
  #8  
Old 25-01-2011, 01:16 PM
Paddy's Avatar
Paddy (Patrick)
Canis Minor

Paddy is offline
 
Join Date: Jun 2007
Location: Strangways, Vic
Posts: 2,208
Thanks Darren, Alex and Ken. I feel very encouraged. I find it interesting how different people like to do this in different ways and come up with great results. So much to learn.

Thanks for encouraging me to submit to ASOD Alex - I might have a bit of a play with the first one to get the scale right before I send it in.
Reply With Quote
Reply

Bookmarks

Thread Tools
Rate This Thread
Rate This Thread:

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT +10. The time is now 10:39 AM.

Powered by vBulletin Version 3.8.7 | Copyright ©2000 - 2019, Jelsoft Enterprises Ltd.
Advertisement
Celestron Australia
Advertisement
NexDome Observatories
Advertisement
Bintel
Advertisement
Meade Australia
Advertisement
SkyWatcher Australia
Advertisement
OzScopes Authorised Dealer
Advertisement
Lunatico Astronomical
Advertisement
Astronomy and Electronics Centre
Advertisement