8" GSO RC with CSL Moonlite FocuserTelevue TV60isLosmandy G11 with Gemini 2 (with Ovision upgrade)
SBIG STT-8300m with Self Guiding filter wheel
A wide assortment of lenses for my Canon.
Mach1GTO / G11/G2 (stock) / AT6RC / AT10RC / TMB92SS / Astrodon 50D / STT-8300M / FW8G-STT / PixInsight / etc, etc. Astrobin - Flickr
Astrophoto: Intes Micro ALTER-M606 (6" f/6 MCT), Astrotech AT6RC (6" f/9 RC), 2x Tair-3 lenses (300mm f/4.5)
Visual: Celestron 8 SCT ('77 Orange Tube, 8" f/10), Selsi #247 Refractor (aka Towa #339, 80mm f/15), Tasco 11TE-5 Newtonian (4.5" f/7.9), Galileoscope (50mm f/10)
Mounts: Celestron CI-700, iOptron ZEQ25GT, Celestron CG5-ASGT, plus a couple old EQ2s My Astrophotography Site: http://ap.x-wing.ca/
Orion 10" f/3.9 astrograph; Celestron C9.25 SCT; Celestron 8 SCT;
Celestron 6 SCT; LX200GPS 10" UHTC; CGEM mount;
Canon 60Da DSLR;
BackyardEOS ~ Purpose-built astrophotography software!http://www.backyardeos.com/CANON, NIKON, QSI, SBIG, ATIK, SX, ASI, QHY, SSAGAT8RC, AT6RC, AT65EDQ, EON 120mm, Lunt 60THa B1200ASTRODON LRGB Ha NII SII OIII (3nm), IDAS, CLS, SkyGlow10Micron GM2000HPS (ordered), NEQ6, HEQ5, CG5-GTOne clear night a year
Quote:I did try to image at F2, but I found it extremely difficult to focus.
Quote:- Second, you can use an external aperture. Get yourself some step-down rings that thread into the filter threads on the front of the lens to redice the aperture before the lens and leave the internal aperture at wide-open. This should (I think) produce the same improvements in sharpness and aberration reduction but with a perfectly round aperture you have no spikes. I have an old lens with a damaged aperture internally so I am going to be trying this trick myself - hopefully it works as I expect!
Quote:Wouldn't using an external mask in front of the aperture cause vignetting?
Quote:Also I believe that the position of the mask should be 'behind'the blades to be able to block the spikes coming from the blades in front of it. In other words an internal mask positioned behind the blades.
Quote:I'm finding that other than the noise level on the DSLR, I'm liking the ease of imaging with the Polarie and DSLR. The noise, I'm not too happy about. My STT-8300 cooled to -25 allows me to take 20 minute exposures. I'm finding that with 20 darks my DSLR images are still full of noise even though the exposures are 20 seconds long.
AP 130 GT 8" EDGE HD AVX on AP Wood Tripod Canon T2i Olde Crow Observatory
Quote:What's laser cutting used for? Normally these specialty shops are not easy to hunt down in Oman. You have to go to the people who typically use these services and ask them where they get their laser cutting done.
Quote:I'm finding that with 20 darks my DSLR images are still full of noise even though the exposures are 20 seconds long.