I used 4H and HB pencils.
Posted 09 June 2013 - 01:01 AM
I used 4H and HB pencils.
Posted 09 June 2013 - 05:07 AM
Posted 09 June 2013 - 01:02 PM
Wonderful to see one of your planetary sketches again.
This one is a superb capture.
Posted 09 June 2013 - 03:46 PM
Posted 09 June 2013 - 04:47 PM
Seeing was excellent. I broke some pencil points during this one, so I couldn't really finish what was started on the rings.
Posted 09 June 2013 - 06:51 PM
Nice work. Tonight the Northeast looks like it could have at least good seeing anyway. Nice to see you post again.
Posted 09 June 2013 - 07:50 PM
Beautiful work. Had to read what a Chromacor was. New one on me.
You sure have captured a nice bit of detail.
Posted 09 June 2013 - 08:45 PM
Posted 10 June 2013 - 11:26 AM
I thought I would take the liberty of resizing this same sketch to represent something closer to an eyepiece view. My reason is that when sketching in the field as I do, a sketcher has to decide how to render details seen as readable. I elect to decide what I do in terms of pencil technique done on computer copy paper very quickly. I just hope things look pretty close to what I think I see through the eyepiece.
Posted 10 June 2013 - 08:45 PM
Posted 13 June 2013 - 03:30 PM
Beautiful sketch work by you, as always. Sorry I am not participating here more lately as I miss allot of great posts by all of you.
I was curious if I may ask, the format size of your sketch. Also, I am impressed that you are using only a 6 inch reflector. I use an old Coulter Odyssey 10.1 inch never collimated f/4.5 bought in 1987, with best eyepiece optics as 9.7mm super-plossl and reasonably good quality 6mm Othoscopic, but that only renders me a 120x and 192x view.
I saw your mention of a 4mm eyepiece optics but not knowing your f/ratio, I assume it is a f/8 and that figures that your 4mm would produce about 305X power. With good seeing conditions your telescope view must be amazing for Saturn. This also indicates what a good 6 inch Newtonian can reveal.
I look forward to seeing more observations and sketches from you. Thanks much for posting.
10.1" f/4.5 Coulter Odyssey 1987
Celestron Nexstar 5i 2004
Orion 7X50 BAK4 Binoculars
40mm Coronado H-alpha Solar Telescope
Mark Seibold CN Gallery- 8 Pages
Posted 13 June 2013 - 10:17 PM
I use a couple of scopes. For this sketch I used a 6" refractor @ f/8. I also use a 6" newton, an old Criterion @ f/8.3. They both can easily support 50x/aperture inch. I also have an excellent 3" prototype achromat refractor design by the great Tom Back.
I had excellent seeing with Regulus showing holding steady for a second or two followed by a very slow undulation of the same time length alternating back and forth at 375x. Seeing conditions is everything.
My format has the globe at ~2" in diameter.