1. Gso parabolic mirrors

Doing some research as I'm hoping to buy my scope Monday.

I went to the gso parent site and found the primaries are bk7 with aluminum coating and the Soi2 coating applied to protect the aluminum from degrigation.

High point has the wave length listed as 1/12wavelength..

So if we apply this to the p-v to wavelength ration we would take 1(12x3.5)^2=1764 or an rms of .01764 . Please let me know if I'm correct here.

I'm trying to learn the scale between good optics and great optics and the effects they have on the image.

2. Re: Gso parabolic mirrors

I am not sure of the technical park but my GSO Dobs is great value for money adjustable bearings in both alt and Az , includes a fan (i have never used it ) duel speed crayford focuser , the only thing I replaced was the 9x50 finder with a 9x50 RACI one and adder a RDF for that quick set up , great scope

3. Re: Gso parabolic mirrors

Oh yeah I've dug In hard o. Reviews and videos the whole nine. I'm really excited I settled on it. But being one of those ppl that want to know as much as possible about what they are using and where to make it better.. I wanna figure the mirror math out lol

4. Re: Gso parabolic mirrors

Good for you! What you need to bookmark is this excellent web resource on telescope optics:

https://www.telescope-optics.net

https://www.telescope-optics.net/reflecting.htm

Has all the formulas you want. It's best to pick as the wavelength of light to be 500-550 nm.

Ty!

6. Re: Gso parabolic mirrors

It is great to know how the various numbers are calculated, but it is also worth having a look at Carl Zambuto's comments about his mirrors. He doesn't use numbers as such, but he has "7 criteria" that all his mirrors have to achieve: https://zambutomirrors.com/zambutoopticalca.html The bottom line is that they will give star tests that are effectively perfect.

I have looked through a number of scopes with Zambuto mirrors, and there is no doubt they are excellent!

However, having said that I have a 12" f5 GSO mirror in my otherwise home-made scope, and I have had it up and running at the same time as friends with Zambuto optics. When I bought it the manufacturer claimed that it had a better figure than those in their production-line scopes: if I remember rightly it was "better than 1/12 wave" vs their then production-line scopes which were "diffraction limited". However, I believe they have since improved their mirrors in general. It is quite thick, so it takes a while to settle down: but when it does it is not put to shame at all by the Zambuto optics... If I was to be really picky, the only difference I have been able to notice is a very slight improvement in contrast (or clarity?) with the Zambuto mirrors; and I attribute this to the smoothness of hand-figured optics vs machine figured like the GSO. There is no doubt in my mind that the GSO mirrors represent great value for money.

Have fun!

Dean

7. Re: Gso parabolic mirrors

Awesome I talked to highpoint yesterday about possibly having it flocked before sent to me. They can't :/ but once I told him my sky conditions he said there was really no point just to flock adjacent to the focuser. His reasoning was because of my conditions. He also said it's an amazing scope that it should do amazing where I'm at.

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