“I am the only person to ever ace a 1951 USAF resolution test. My 'to observe' list says 'done'. I do not use charts or atlases when I starhop; men do not use maps. One of my sketches won an SBIG deep sky imaging contest. I am the life of star parties I have never attended. I never say anything looks like a faint fuzzy - not even a faint fuzzy. Pilots aim green laser pointers at me. Don Pensack proofreads my CN forum posts.” - The Most Interesting Astronomer in the Universe
Quote:Heck, Celestron and Meade could *include* them with their scopes. Producing a solidly mounted, precision mask would literally cost pennies.
I ache, therefore I am
Celestron C11+EQ6, skywatcher /Zambuto 12"dob,watchhouse tracking platform, 16"/Zambuto lightbridge , Ethos's 6,8,10,13,17,21. Naglers 31,26. Lieca ash zoom, televue 2.5 powermate,2"2x powermate .Paracorr type2. Howie glatter 2" laser & Tublug. Lumicon 2" UHC, 03, H-Beta,Televue smoothies ( all of em) , Meade 4000 smoothies ( all of em). That'll do for now.
Quote:My question is this. Given the exorbitant prices fetched for SCT collimation tools like the Hotech unit, why hasn't any commercial producer bothered to manufacture Duncan Masks for commercial SCTs? Heck, Celestron and Meade could *include* them with their scopes. Producing a solidly mounted, precision mask would literally cost pennies.Orion? Astrozap? Scopestuff? Are you listening? - Jim
Modded C9.25, Vixen SP retrofitted with DS motors and Autostar My pics Stars light the world without, to give us purpose They light us within to give us reason We live in a well-lit abyss.
Quote:I built one for my C11 but didn't like it as the pattern it produced was too dim. Maybe I didn't understood the formula and made a mistake during the design phase. I will produce another one asap.
CG5ASGT Astro-Tech AT6RC Zhumell 10 inch dob deluxe kit 10x12 observatory Echo Astronomy maker of Custom bahtinov masks and Duncan collimation masks.
Quote:You should have said, "The SGCD is so simple, it cannot be invented. I am not the inventor." The uses of a stick are many, but how does one invent one? You found a new use for an old device.Ajay
I lost count of my scopes. Now I just want mobility. I came, I saw, I bought some interesting accessories, and put names to faces: NEAF 2012, ASAE 2012, SWAP 2013, ASAE 2013.
Be easy to laser cut, what is the math behind it?
-DannyMy warehouseMy Channel
Quote: Jim, they don't bring out product because they know they can't beat the Sheer Genius Collimation Device.It's priceless.
CPC 1100, Celestar 8, Televue Pronto, ZEQ25gt Mount, Sky Safari/iPad
Quote:Gday Greg Quote: Jim, they don't bring out product because they know they can't beat the Sheer Genius Collimation Device.It's priceless. Unless you have bicycle spokes About 5c each.This allows you to adjust the collimation easily whilst looking through the EP and no risk of hitting the corrector with your fingers or allen keys etc.Andrew
Quote: Those are very clever, though from the point of view of indicating which screw needs adjustment you need one shadow. Three would be confusing.
Quote:The Duncan mask worked as described.
My AstroBin page.
Quote:Apologies if everyone already knows about this collimation / focusing aid, but anyone have any personal experience with one of these (GoldFocus)?