jack
New Member
Posts: 8
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Post by jack on Aug 16, 2014 8:56:19 GMT -5
Sorry to bother you with this simple question. I'm not an experienced ATM. Purchased a 6 inch f15 achro about a year and a half ago. Finally getting around to building my folded refractor. Don't remember any mounting bolts coming with the lens. If they did, I've lost them. Three of the six holes are threaded. Can anyone tell me what size bolt/thread I should use. Thanks.
Jack
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paulci
Junior Member
Posts: 20
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Post by paulci on Aug 16, 2014 14:36:53 GMT -5
HI Jack,
I'm sure they are 5mm without going to the extent of un packing my 8" F12 lens.
Hope this helps
Regards
Paul
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Post by Ales - iStar Optical on Aug 17, 2014 8:21:07 GMT -5
Sorry to bother you with this simple question. I'm not an experienced ATM. Purchased a 6 inch f15 achro about a year and a half ago. Finally getting around to building my folded refractor. Don't remember any mounting bolts coming with the lens. If they did, I've lost them. Three of the six holes are threaded. Can anyone tell me what size bolt/thread I should use. Thanks. Jack Jack, all of our lenses use 6 M5 Metric size bolts. Three are going THROUGH the unthreaded holes into M5 holes in counter cell. 3 are bolted into the threaded holes to push back to lock the collimated lens in place. But if your construction is perfectly square, you don't need those extra 3 bolts to lock the collimation. The collimation will already be spot on. In all of our scopes, the collimation is perfect right after we carefully attach the lens. Good luck with your build. Is your lens an iStar or some other brand? Just curious. Best regards, Ales |
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jack
New Member
Posts: 8
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Post by jack on Aug 22, 2014 9:15:28 GMT -5
Ales,
Please forgive the late reply. Yes, the lens is an iStar. And your comment about the collimation was validated by my results with a folded refractor scope I finished a few days ago. I decided to forget about the push-pull process, and just attach the lens to a wooden mount which is bolted into the wooden box of the dob-style ota. A laser shows the collimation to be almost perfect. Have only had a few minutes of partially clear sky since finishing the project. The only bright star I could use as a test was Arctaurus. Turbulence prevented me from getting as accurate a star test as I would like, but I could see no difference in the image when compared to that of my TV85, except that it was MUCH brighter.
I'll post a picture of the scope on CN, or on your site. If people knew what you can do with basic hand tools to have a 6 inch refractor that can be easily rolled out of a small garage, we might start to see more folded refractors.
Jack
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Post by Ales - iStar Optical on Aug 22, 2014 12:38:07 GMT -5
Ales, Please forgive the late reply. Yes, the lens is an iStar. And your comment about the collimation was validated by my results with a folded refractor scope I finished a few days ago. I decided to forget about the push-pull process, and just attach the lens to a wooden mount which is bolted into the wooden box of the dob-style ota. A laser shows the collimation to be almost perfect. Have only had a few minutes of partially clear sky since finishing the project. The only bright star I could use as a test was Arctaurus. Turbulence prevented me from getting as accurate a star test as I would like, but I could see no difference in the image when compared to that of my TV85, except that it was MUCH brighter. I'll post a picture of the scope on CN, or on your site. If people knew what you can do with basic hand tools to have a 6 inch refractor that can be easily rolled out of a small garage, we might start to see more folded refractors. Jack Jack, the first peak through your new scope look promising. Definitely post some photos and description of your new telescope both on Istar Scope Club and the Cloudy Nights. Im happy to see that Istar Scope Club is getting more popular every day, but the CN is still the most visited astronomy related forum, even though the large refractor owners (especially those having achromats or Rx doublets) are frequently treated with disrespect for their decision to use these fine instruments. This is why many large achro refractor owners stopped posting there. Don't be one of them. People deserve to hear the real life experience even if the radical fraction of CN members will immediately question your motives and openly make fun of your observations... The simple fact is that anyone who ever looked thru a well designed and well made achromatic or Rx refractor must agree that there is simply no comparison..... well, yes... an APO will do the trick too :-) So Im really looking forward your new posts! Best regards, Ales |
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Post by boomboom on Aug 27, 2014 23:31:37 GMT -5
Hi Jack,
Yes post your scope here and CN. I'm redoing my 19th century pillow block mount here on ISC and when it's done I'll do a write up on CN.
Did the same with my 6" f12 which is my avatar on CN where I go under the name of Messyone....which is a sad but true indication of how things generally are!
One look at my shed would make it obvious.
Happy ATMing
Matt
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jack
New Member
Posts: 8
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Post by jack on Aug 28, 2014 18:50:30 GMT -5
Matt,
I posted a few comments and three pix on the Istar ATM page. I'll take your (and Ales) advice and post the project, with a little more detail, on the CN ATM or Refractor page in the next week.
Jack
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