th
New Member
Posts: 4 
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Post by th on Nov 16, 2016 17:27:16 GMT -5
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Post by nobody on Nov 17, 2016 4:26:07 GMT -5
Hi Tom
What a superb modification! What was the weight reduction?
Did it make the telescope easier to mount without wobble?
Did you notice any visible difference in the image quality?
It would be a very interesting comparison between the solid tube, the bare 'skeleton' or when shrouded with cloth.
There are many myths about tube design and their thermal effects on image quality.
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th
New Member
Posts: 4
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Post by th on Nov 18, 2016 3:19:02 GMT -5
Hi Tom What a superb modification! What was the weight reduction? Did it make the telescope easier to mount without wobble? Did you notice any visible difference in the image quality? It would be a very interesting comparison between the solid tube, the bare 'skeleton' or when shrouded with cloth. There are many myths about tube design and their thermal effects on image quality. Hi Nobody, reduction weight tube is -3,5 kg. Reduced I'm also objective lens cell -1,5 kg, also socket for focuser -0,4 kg... Weight telescope is now 12,6 kg (objective + tube + focuser). Difference in image quality I'm didn't recognize. Telescope with "skeleton" tube is faster cool down. Shall I little experience in new "skeleton" tube. Perhaps only 5x I'm be under sky... But I see rille in Vallis Alpes on Moon as dark line with use binocular Baader MaxBright Viewers. |
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Post by nobody on Nov 19, 2016 11:49:24 GMT -5
Hi Tom That is quite a remarkable weight reduction. Congratulations!  It must have been a lot of work to make all those holes so neatly. Did you use the original iStar light baffles? Or did you make the holes at the correct spacing to use the original baffles? Chris |
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th
New Member
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Post by th on Nov 19, 2016 17:25:11 GMT -5
Hi Chris,
no, original IStar 3 baffles are too heavy. New 7 baffles are from sheet 0,8 mm aluminium. Are laser cutting and coated self-adhesive black velure.
Tom
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Post by nobody on Nov 20, 2016 1:48:52 GMT -5
Hi Tom
Well done!
You have done a great job and have a completely unique instrument.
It also balances in the middle of the tube like a refractor should.
Enjoy the results of your skill and daring.
Chris
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th
New Member
Posts: 4
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Post by th on Nov 20, 2016 3:04:03 GMT -5
Hi Chris. Thank for your nice words. You have also very much nice and interesting telescope. Also your web internet pages are very much interesting.
Tom
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Post by nobody on Nov 20, 2016 8:01:55 GMT -5
Hi Chris. Thank for your nice words. You have also very much nice and interesting telescope. Also your web internet pages are very much interesting. Tom Thanks, Tom. Chris |
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Post by Ales - iStar Optical on Jan 13, 2017 14:32:22 GMT -5
WOW! Pretty drastic way to decrease OTA weight.... but VERY effective! Congratulations Tom. Great job, wonderful scope! Enjoy!
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