C8 tolerance to eyepieces?

[emadmoussa]

Like you all know, if you have a reflector of 8" plus any weak spots in eyepieces will show. I was wondering whether this is the case for Schmidt Cassegrains...say C8?

[John]

SCT's generally operate as F/10 systems so should be fairly tolerant when it comes to eyepieces. 

[michael.h.f.wilkinson]

SCTs are tolerant, but quality still shows

[Moonshane]

it's more to do with focal ratio than aperture. a 12" f10 dob would be just as tolerant of poorer quality eyepieces (and of course also have a pretty long tube    ) 

[Pig]

The quality of an eyepiece certainly does show in SCT even. if they are more forgiving

[emadmoussa]

The quality of an eyepiece certainly does show in SCT even. if they are more forgiving

Yep - I can imagine. On the other hand fast reflectors are as vindictive as local councils...

[Pig]

I hope they do a better job than the local councils

[emadmoussa]

I hope they do a better job than the local councils

As far as street lights are concerned they're absolutely rubbish. Sent you a PM.

[Pig]

You should try Northampton BC they are an absolute nightmare at best

[LukeSkywatcher]

I have a range of EP's which i use with my 8" SCT. Some are cheap,some or middle of the road and a couple are expensive. I cant see any difference between any of them apart from the better quality ones do give better views,so SCT's are forgiving but quality does count.

Vixen NPL's are great and not expensive and they do work well in the SCT.

[scarp15]

Certainly an SCT is fairly tolerant, yet as others have stated, quality eyepieces are a noticable improvement.

[michael.h.f.wilkinson]

I should say I spent many years with decent quality Plossls with my SCT, and upgraded the 10mm to LV 9mm and 7mm for reasons of eye relief more than anything else. Only when I started to see the limitations of the kit I had did I start to replace it. I would suggest spending lots of time at the EP before thinking about replacing them. If you already have fast scopes, don't worry about their performance in slow scopes. If you like waht you see in a fast scope, the slower SCT will certainly not show any defects you did not see before

[Naemeth]

I should say I spent many years with decent quality Plossls with my SCT, and upgraded the 10mm to LV 9mm and 7mm for reasons of eye relief more than anything else. Only when I started to see the limitations of the kit I had did I start to replace it. I would suggest spending lots of time at the EP before thinking about replacing them. If you already have fas scopes, don't worry about their performance in slow scopes. If you like waht you see in a fast scope, the slower SCT will certainly not show any defects you did not see before

+1

Quality definitely does shine through though, so the supplied eyepieces you get with new telescopes won't be as good as the TeleVue eyepieces, it's just the performance will be closer at F/10 than F/4.

[Pig]

I do wonder sometimes about speed of scopes and its relevance with non AP.

My brothers has a P200 on an EQ5 HD it is in great condition which I believe it is an F5 or F7 and he has some pretty well known high quality eyepieces.

Comparisons have been performed when the scopes are side by side in the same garden at the same time looking at the same objects.

The overall decision is the observations are better on my SCT with the TV eyepieces.

[Naemeth]

I do wonder sometimes about speed of scopes and its relevance with non AP.

My brothers has a P200 on an EQ5 HD it is in great condition which I believe it is an F5 or F7 and he has some pretty well known high quality eyepieces.

Comparisons have been performed when the scopes are side by side in the same garden at the same time looking at the same objects.

The overall decision is the observations are better on my SCT with the TV eyepieces.

I think it is relevant when you are talking about TFOV, otherwise (with quality eyepieces) it makes little to no difference. One thing to remember is that with any given eyepiece, an F/5 will have a field of view that is 4x that of an F/20 - certainly not insignificant.

[Pig]

I think it is relevant when you are talking about TFOV, otherwise (with quality eyepieces) it makes little to no difference. One thing to remember is that with any given eyepiece, an F/5 will have a field of view that is 4x that of an F/20 - certainly not insignificant.

But what about the clarity as opposed to the size ?

[Naemeth]

But what about the clarity not the size ?

From what I can remember of my views through F/10 compared to F/5, it doesn't really make any difference. It's not so reliable to rely on memories, but I could probably set-up a side by side with an F/5 Achro and F/7.5 ED Frac if it would help? (Same aperture)

[Pig]

I think we can trust your memory you are quite a smart young man from all accounts   A comparison is always good to read though, so please feel free

I sometimes wonder if I have triangle eyes as I do not get the same observed results as others ( My brother & TFOV apart as that is simple maths)