F6 or higher

[Scott Brown]

Hi guys.... Just a quick question so I understand the differences here. I have a F6 scope so am I correct in saying a F5 scope is known as a " faster " scope. Also when they refer to F5 or higher would the higher be F6 F7 F8 etc or would it go down the way the same as " faster "  sorry if the answer seems obvious as I'm just trying to get my head round all these numbers. Thanks in advance...... Scott

[PeterCPC]

The lower the F number the faster the scope. F5 is faster than F6.

Peter

[Scott Brown]

Thanks Peter..... When I read about an eyepiece that's good for F4 and above does this mean it's good for an F6 or does it go the other way and is good for a F3. Thanks

[PeterCPC]

I am an imager so I don't really use EPs but, if it says F4 and above, then I would take that as F4, F5 etc. Unless someone else knows better.

Peter

[PeterCPC]

You might like to read this:-

Peter

[michael.h.f.wilkinson]

The slower the scope, the narrower the light cone, so the easier it is to correct for astigmatism in particular. So indeed, if an EP is suitable for F/4 and above, they mean F/4 or slower

[laudropb]

The short answer is that this eyepiece would be fine in your scope.