More 'in' focus or more 'out' focus ??

[Skipper Billy]

I am messing about setting up a new scope that Santa left a little early.

I have managed to achieve focus on a distant object messing about with different combinations of extension tubes.

But I am almost wound all the way in.

Will a star require the focuser to be wound further in or further out than the correct focus on a trig point about a mile away??

If its further out I am in business - if its further in I will need shorter extension tubes !!

It s 6" RC if that makes any difference.

Thanks folks and HAPPY CHRISTMAS !!!

[steppenwolf]

Stars are farther away than a terrestrial object so the focuser would have to move further IN to achieve focus. However, at a mile away, you are pretty much at 'infinity'!

[iwols]

hi billy can you try to focus at something half the distance you are and work it out from that?

[Davey-T]

If you can focus stars with a Barlow but not without it needs more in travel.

I guess you're imaging ? will a diagonal focus.

Dave

 

[gnomus]

I can't believe you get to open your presents early.  You must have been a really good boy this year.

[cjdawson]

16 minutes ago, gnomus said:

I can't believe you get to open your presents early.  You must have been a really good boy this year.

Na, he just moved to the Pacific

[Skipper Billy]

Thanks guys - I did try focusing on something nearer but its too dark now and there is no way I am taking it outside in this weather !!!!

Will have another play tomorrow !!

Thanks for all your helpful suggestions.

 

[wimvb]

+1 for @steppenwolf. But maybe you don't need the extension tubes. It's hard to believe that a scope can't focus at infinity. Hope the weather improves, so you can enjoy 1st light with your scope.

Merry Christmas

[Skipper Billy]

7 minutes ago, wimvb said:

+1 for @steppenwolf. But maybe you don't need the extension tubes. It's hard to believe that a scope can't focus at infinity. Hope the weather improves, so you can enjoy 1st light with your scope.

Merry Christmas

The scope came with two one inch and one inch and a half extension tubes to allow everything to reach focus from straight visual with a diagonal to DSLR and in my case a filter wheel and CCD - so there were many combinations to try out !! 

It looks like just one 1" will do it but I cant be sure until tomorrow !

God Jul !