Image of the day

Captured by
Erwin Forbragd

Horsehead Nebula

About Astromart

My Account

New to Astromart?

Register an account...

Need Help?

Posts Made By: Mike Neus

March 13, 2003 12:03 AM Forum: Eyepieces

1 1/2" eyepices--vs.--2" eyepieces @ 32mm?

Posted By Mike Neus
Depends on the eyepiece design. In typical 50-55 degree FOV (i.e. Plossls, Ultima), 30-32mm is about all you can go before the format becomes a limiting factor (i.e. the barrel restricts the FOV). For wide field designs (70+ degree FOV), the limit is about 20-25mm.

As the other Mike said though, your problem is not restricted FOV, it's too much eye relief. A long rubber eyecup might help position your head, but a 30-32mm should prove to be much better.

May 29, 2003 06:43 PM Forum: Equipment Talk

Barlow Lens

Posted By Mike Neus
Antares carries the same 3 element barlow, less the grip ring, for a lower price.

June 12, 2003 04:09 PM Forum: Eyepieces

Seibert lenses - disappointed

Posted By Mike Neus
Siebert doesn't make plossls. Are you sure it's from him? Call him and talk to him about the problem, he's been very easy to work with in the past. Sounds like you got a dud.

September 11, 2003 06:29 PM Forum: CCD Imaging and Processing/Solar System

Mars on the 27th with my ETX 90

Posted By Mike Neus
Steve, good start! I think if you played with lowering the gamma or move end points you could bring out some of the surface detail.

September 11, 2003 06:31 PM Forum: CCD Imaging and Processing/Solar System

Mars and AVI files???

Posted By Mike Neus
I've been playing with Iris the last few days. It's largely command line driven so a bit difficult to use. It's supposed to handle AVIs but when I try some created with my DV camcorder it says "Decompressor not found". It will automatically sort images by quality though, and that's how I pick X out of Y frames.

March 3, 2004 08:06 PM Forum: Film Astrophotography - Imaging and Processing

Focusing Limits

Posted By Mike Neus
If you move the mirror as others suggest you will increase vignetting, perhaps to the point that the secondary can no longer "see" the full aperature of the telescope. It is of course free. My solution to this problem was to buy a low profile focuser with a 1.5" extension tube to retain the overall focuser length to ensure eyepieces focus. The extension comes out for photography.

Funding Member

Sponsors


View all sponsors

Search