6" instead of 130PDS

[TareqPhoto]

Hi all,

I know there is a thread about the scope Skywatcher 130mm PDS, nice images there, but i am planning to buy 150mm [6"] F4 instead, first it is larger so aperture rule applied, second it is F4, and third it is very slightly wider, so what do you think about that really? I even can buy two of those 6" F4.

[Ronclarke]

If you mean the 150 PDS then it is F5 (750/150) but does let a lot more light in than the 130PDS.

Ron

[Timebandit]

 

It depends what you are going to use it for AP or visual. Aperture rules with visual as long as all other factors are equal. But size also can be a problem for some with more aperture for carrying the scope, as well as mounting the larger scope sizes. 

With AP you need to make sure you have a mount capable of taking a bigger scope, as otherwise a complete waste of time. Also with AP the bigger scope can act as a bit of a sail in the wind ,so again depending where it will be use and the mount capability with the bigger scope.

Hope this helps

 

 

 

[michael.h.f.wilkinson]

There are some 6" F/4 scopes around, but they are fiddlier in terms of collimation, and will show more coma, so a coma corrector needs to be factored in.  I am using a 6" F/5 Schmidt-Newtonian, which has shown real promise in the last few days, but I do use a Vixen GP-DX mount, which is a pretty solid beast. Haven't ironed out all the issues with the set-up, but provided you have a solid mount, DSO imaging with a 6" Newtonian is doable.

[TareqPhoto]

7 hours ago, Ronclarke said:

If you mean the 150 PDS then it is F5 (750/150) but does let a lot more light in than the 130PDS.

Ron

I mentioned 3 models, 150PDS which is F5, and 130PDS, and there is also 150mm F4 from another maker or brand which is 600mm or 612mm, so that 150mm [6"] F4 is the wider and faster, and it is the one i think more about really.

[TareqPhoto]

6 hours ago, Timebandit said:

 

It depends what you are going to use it for AP or visual. Aperture rules with visual as long as all other factors are equal. But size also can be a problem for some with more aperture for carrying the scope, as well as mounting the larger scope sizes. 

With AP you need to make sure you have a mount capable of taking a bigger scope, as otherwise a complete waste of time. Also with AP the bigger scope can act as a bit of a sail in the wind ,so again depending where it will be use and the mount capability with the bigger scope.

Hope this helps

 

 

 

That is solved about issues you talked about, and it is for AP definitely.

[TareqPhoto]

6 hours ago, michael.h.f.wilkinson said:

There are some 6" F/4 scopes around, but they are fiddlier in terms of collimation, and will show more coma, so a coma corrector needs to be factored in.  I am using a 6" F/5 Schmidt-Newtonian, which has shown real promise in the last few days, but I do use a Vixen GP-DX mount, which is a pretty solid beast. Haven't ironed out all the issues with the set-up, but provided you have a solid mount, DSO imaging with a 6" Newtonian is doable.

I have a solid mount, and i have a coma corrector for F4.

[Nova2000]

Hi the local club has a Gso 6 f4 Newtonian. Collimation needs the be spot on . 

[TareqPhoto]

16 minutes ago, Nova2000 said:

Hi the local club has a Gso 6 f4 Newtonian. Collimation needs the be spot on . 

Ok