focusing problem

[astrokat]

i cant seem to focus my camara on my wo zenithstar 70 though i can when i have a barlow on the telescope aswell why is this and how do i get over it .

thank you toby:D

[Psychobilly]

Do you mean even with the focuser racked all the way out you cant get focus? if this is the case then your going to need an extension tube when your using the camera... normally one around 2" long is plenty... use a 2" pushfit to T adpator...

Peter...

[astrokat]

as i focus in on the object it stars to come into focus but i can go in any more because it hit the base of the scope sob sob tryed ti image sadr and could not achive focus

[Merlin66]

Are you using the diagonal?

This should be removed and replaced with a spacer as Pete suggests.....

[astrokat]

where do i get a spacer from thanks toby

[Merlin66]

If you have a 2" focuser something like this should do the job

Adaptors

The 50mm is usually OK

There are similar versions for the 1.25" as well.

[astrokat]

ok thank you and this will sort my problem out .

[Psychobilly]

Almost certainly it will...

How are you connecting the camera to the scope at the moment there might be something you can try to prove that the camera needs to be further back...

Peter...

[astrokat]

im putting it in i directly into the scope but when i try to focus on a star/area i cant reach focus, when focusing i ajust untill i can no more because it in all the way if this makes sence

thank you for you help you guys are so helpfull

[Psychobilly]

What adaptor are you usign to connect the camera to the scope .. is is a 1.25" T adaptor or a 2" and do you have a diagonal to match ?

A few more questions and we should get there...

[astrokat]

1.25 t thet wo diagonal makes it worse

[Psychobilly]

this isnt makign much sense to me at teh moment... I would have expected the problem to be that you dont have enough backward travel on the focusser... and was going to sugest slackening off the adaptor whislt supporting the camera nd moving it back slowly to see if you can get focus...

The diagonal should have provided enough extra distance and may need you to rack the focus inwards to get focus ... when compared to having the camera fitted directly into the focuser ...

Any one else got any ideas?

Peter..

[astrokat]

if not i will have another go and try to get a better idea ,it just seams old i will let you know tomoz

[Psychobilly]

What did you do with the "barlow" ?

I dont like hannging DSLr's of diagonals its askign for trouble really... and 2" fittings are better than 1.25" as you will have a lot less vignetting...

But for the purpose of the test ... and you can try it in daynight on a distant target just rack the focuser over full travel with the camera connected directly to the scope ... if focus gets better as you rack the focuser out but never gets there rack it back in fit the diagonal and put the camera in there as well and rack it back out... you should get focus on there...

Peter...

[astrokat]

i could get in focus with the barlow in but not with out !!

[Psychobilly]

I have suggested all the things which I can think of and a series of things to try in a structured way... but at a dead end now sorry...

Peter...

[astrokat]

no worrys bud