2" filter threadPosted By David Simper |
Do you know the specifics of it ? Is it 48mm x0.75mm pitch ?
Posts Made By: David Simper
August 17, 2003 02:20 AM
Forum:
Equipment Talk
August 27, 2003 06:18 PM
Forum:
Equipment Talk
Re: Has anyone used it yet?Posted By David Simper |
Not yet, why ? I can find your Tuthill mount also here on AM.
David
David
May 24, 2004 05:19 AM
Forum:
Chinese Optics Imports
Re: Astromart ad for 102/f6Posted By David Simper |
A second, similar one has just appeared.
June 8, 2004 05:04 PM
Forum:
Telescope Making
Secondary sizePosted By David Simper |
What size of secondary would you recommend for
16" f4.7
12" f5.8
telescope ?
Thanks.
16" f4.7
12" f5.8
telescope ?
Thanks.
July 11, 2004 01:26 AM
Forum:
Equipment Talk
Re: WHY CANT PEOPLE JUST HELP!!!!!!!!!Posted By David Simper |
:C 1.Unlock the Caps Lock button
2. You got some good advice on collimation, so do it and go observing with your C9.25.
>
3. Don't call people names
2. You got some good advice on collimation, so do it and go observing with your C9.25.>
3. Don't call people names
November 9, 2004 01:49 AM
Forum:
Equipment Talk
Re: Your Thoughts:Posted By David Simper |
>>I would like to get something like the "ball-and-socket" Edmund Astroscan, except in an 8" aperture, but not like the Portaballs with the nuisance of their truss poles. This is why I hated that 20" Obsession. After 3 star parties, I began to see that I made a big mistake! Who wants to assemble and disassemble 8 truss poles and connect and disconnect them with the upper and lower sections twice for each outing? Some people think this is fine, but not me!
Seems to me that you are describing a pop-up telescope:
http://www.johnsonian.com/
Pick the size right for you.
Seems to me that you are describing a pop-up telescope:
http://www.johnsonian.com/
Pick the size right for you.
January 13, 2005 12:55 AM
Forum:
Equipment Talk
Johnsonian pop-up carbon scope - any out ?Posted By David Simper |
Have you observed through this scope ? There were some voices about collimation sagging when pointed too far from the vertical...
David
David
January 19, 2005 11:58 PM
Forum:
Refractors
Optimization of a fluorite doubletPosted By David Simper |
How much better would be a 5" fluorite doublet if the mating element would be optimally chosen for optical quality of the objective instead of putting priority on the ease of production (Tak example). Would there be e.g. noticeably less "warmth' in the picture ?
April 30, 2005 05:29 AM
Forum:
Binoviewers
Macro pic for checking clear aperturePosted By David Simper |
I have just received one sample, reportedly from last batch, of the Chinese NORINCO binoviewers.
The opening at the bottom of the EP end seemed somehow small to my eyes so I took a macro photo of that end, blew it up on the monitor and measured with a ruler: I am getting just 16mm, less than I expected.
Do I make a logical mistake somewhere or is it so ?
The opening at the bottom of the EP end seemed somehow small to my eyes so I took a macro photo of that end, blew it up on the monitor and measured with a ruler: I am getting just 16mm, less than I expected.
Do I make a logical mistake somewhere or is it so ?
June 20, 2005 05:15 AM
Forum:
Binoviewers
Where is the problem (ED114&Bino)Posted By David Simper |
I have just tried w/o success to bring to focus this combination:
Orion by Vixen ED114 f5.3
aftermarket Joe Cartolano 2" adapter on the end of the Vixen tube
Vernonscope 2" diagonal
no name 2"->1.25" adapter (the lip is ca 8mm, but the adapter is right for this setup as I >just< clear the mirror with the end of the Siebert 1.6x OCA, which sits on the original bino tube)
Burgess C bino with 20mm EPs
I lack some more infocus with glasses on or even more with glasses off (I am myopic i.e. need more intravel)
Generally, my setup looks like pics 5 and 6 here
http://www.siebertoptics.com/SV1.6.html
Of note, I can't screw the OCA directly into the body (for use with a 1.25" diagonal) of the bino as the threads are different. I seem to recall some talk about this problem. The thread on the end of the OCA seems to be removable, held by two set screws.
Plus, my 1.25" diagonal has plastic body, I would not trust it the weight of the setup. I like the stability of using the 2" mirror.
Thanks for your suggestions. I suspect it might be a peculiarity of the short f.l. Vixen.
David
Orion by Vixen ED114 f5.3
aftermarket Joe Cartolano 2" adapter on the end of the Vixen tube
Vernonscope 2" diagonal
no name 2"->1.25" adapter (the lip is ca 8mm, but the adapter is right for this setup as I >just< clear the mirror with the end of the Siebert 1.6x OCA, which sits on the original bino tube)
Burgess C bino with 20mm EPs
I lack some more infocus with glasses on or even more with glasses off (I am myopic i.e. need more intravel)
Generally, my setup looks like pics 5 and 6 here
http://www.siebertoptics.com/SV1.6.html
Of note, I can't screw the OCA directly into the body (for use with a 1.25" diagonal) of the bino as the threads are different. I seem to recall some talk about this problem. The thread on the end of the OCA seems to be removable, held by two set screws.
Plus, my 1.25" diagonal has plastic body, I would not trust it the weight of the setup. I like the stability of using the 2" mirror.
Thanks for your suggestions. I suspect it might be a peculiarity of the short f.l. Vixen.
David
Funding Member
Sponsors
- Anacortes Telescope
- ASTROPHOTOGRAPHY BY MARTIN PUGH
- Astromart Customer Service
- Alpine Astro
- BBLABS LLC
- jp Astrocraft, LLC
- Bob's Knobs
- victoryastroshop
- FocusKnobs
- SellTelescopes.com
- Astro-Physics
- Desert Sky Astro Products
- RemoteSkies.net
- AstroMart LLC
- astronomy-shoppe
- GetLeadsFast, LLC
- APM-Telescopes
- Rouz Astro
- Westsource Corporation
View all sponsors