GSO Optics

[Gargoyle_Steve (Steve)]

.... only if you speak mirrorese!


Being the owner of a 12" GSO mirror (and accompaning scope) myself I'd be interested to hear how bad or good those numbers interpret as.

Steve

[PCH (Paul)]

Guys,

can anyone offer a comment on the comparative quality of the Skywatcher dobs, as l'm considering buying quite shortly. For those of you more experienced than I - and there's pretty much only the parrot that isn't - how do these stack up against the other brands such as Bintel and GSO.

Cheers,

Paul

[iceman (Mike)]

Hi Paul.

If I were you, I'd treat them as equal and then base your decision on price and what you get with it.

The mirrors themselves are made in different factories by different companies, but I don't know many who have compared them side by side. Janoskiss has, and he loves his skywatcher. Maybe it's worth looking through some old threads of his and see his thoughts on his skywatcher.

MyAstroShop sell the skywatchers and will do a good deal for you too. Make sure you mention IIS!

[duncan]

Hi all,
My 12" Bintel Dob shows some stigmatism, but i think it is more the eyepieces than the main optics. When i move my eye across the eyepiece the little flares on some of the brighter stars moves as well or dissappears. Anyway it doesn't bother me much. One day i'll borrow or buy an expensive eyepiece to check. Out of focus stars are nice and round with central donut, but again the donut moves when your eye changes position across the eyepiece to.
Thank God for the internet and easy communication, imagine being totally alone trying to solve all these problems,LOL.
Value for money you can't beat the big Dobs.
Cheers

[Sentinel]

Originally Posted by duncan

Hi all,
My 12" Bintel Dob shows some stigmatism, but i think it is more the eyepieces than the main optics. When i move my eye across the eyepiece the little flares on some of the brighter stars moves as well or dissappears. Anyway it doesn't bother me much. One day i'll borrow or buy an expensive eyepiece to check. Out of focus stars are nice and round with central donut, but again the donut moves when your eye changes position across the eyepiece to.
Thank God for the internet and easy communication, imagine being totally alone trying to solve all these problems,LOL.
Value for money you can't beat the big Dobs.
Cheers

Duncan,

Sounds like coma to me, or an eye issue.

If you had astigmatism in the primary the aberration inside focus and outside focus will move 90 degrees. Focus will normally be an issue.

A step up in quality in regards to eyepiece normally has a significant improvement of the view.

[duncan]

Hi Paul,
Yep, i reckon it is just the cheap eyepieces (came with the scope). Collimation is fine, could do with a set of teenagers eyes though,LOL. What i'm seeing is like a little triangular spear off one side of a star. Might just be my eyes. Middle age it probably is,LOL.
cheers

[Matthew Lovell]

Hi Aster,

Yes, we have tested a few. I can send you some result of one if you like.

Using Texereau:

Strehl around 88%
Maximum Wave Front Error 1/8

Pretty good eh?

Matthew Lovell

[Matthew Lovell]

Hi Aster,

Yes, we have tested a few. I can send you some result of one if you like.

Using Texereau:

Strehl around 88%
Maximum Wave Front Error 1/8

Pretty good eh?

Matthew Lovell