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Post by omedinaw on Jun 24, 2016 10:26:11 GMT -5
Greetings, I would like to construct a large 150mm build from a TOA150 OTA that I acquired some time ago. I have a line on the focuser but lack any optics for the unit. Any assistance will be greatly appreciated. additional I have provided some data on the TOA150 and a picture of its original objective package.
Thanks Sam |
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Post by omedinaw on Jun 24, 2016 10:45:50 GMT -5
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Post by omedinaw on Jun 24, 2016 10:48:29 GMT -5
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Post by nobody on Jun 25, 2016 11:55:45 GMT -5
Hi Sam.
I think you meant to say a large refractor build rather than a reflector.
Unfortunately iStar now only offer a 150mm f/5 in a normal achromat in this size.
This will have a great deal of achromatic aberration [false colour] compared with a high quality Tak Apo triplet.
Nor is there any guarantee that the supplied metal cell will fit your OTA.
Not even if you sawed the original tube shorter.
A 6" f/5 achromat would be ideal for low power, wide field views.
But not likely to be ideal for high magnifications on the planets or the Moon.
What happened to the original Tak triplet?
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Post by Ales - iStar Optical on Jul 1, 2016 6:18:05 GMT -5
Greetings, I would like to construct a large 150mm build from a TOA150 OTA that I acquired some time ago. I have a line on the focuser but lack any optics for the unit. Any assistance will be greatly appreciated. additional I have provided some data on the TOA150 and a picture of its original objective package.
Thanks Sam Hello Sam, you must make sure that our iStar lens cell will fit your Tac scope. From experience I can say "most likely NOT".... Im still in Europe, recovering from my first surgery but I will be back home in Arizona by mid July. I can send you drawing of our 150mm lens cell so you can compare. Our 150 F5 is good for low power, wide field views only. Do not expect higher than 30x magnification without seeing lots of false color around bright stars. We might produce small batch of 150 F5 R50 doublets, those would be much better (but still not comparable with your original Fluoride triplet!!). Your triplet offers excellent overall views. Our R50 would show great views up to 50x, so again, suitable mainly for low power, deep space observing. I hope this info helps, cheers, Ales |
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