Skywatcher 80 ed focus with a x85 reducer

[newbie alert]

Hi guys..after a bit of info regarding the focus point of my skywatcher 80 ed(light blue one)

 I bought it secondhand,and as i wanted to use it for imaging i bought the x85 reducer to go with it,then had to buy the adapter to enable to push fit into the focusser..then had to buy a m42 to m48 adapter to fit to the canon t ring..it all fits but cant get sharp focus on it...the focusser is racked all the way in , i feel i need it to go another few mm to achieve sharp focus..does that mean the adapter tube is too long,or too short..or is it the extra spacer from the m42-m48 thread causing some probs..

I can use it without the reducer but find its a bit slow..any ideas? i enclose a pic of the setup..

[Marky1973]

Can you not screw the reducer directly to the focuser tube? That's what I do, I don't use the nosepiece. Might give you a few extra mm - never had a problem with thatsame set-up, minus the nosepiece.

[parallaxerr]

Marky beat me to it, I thought that reducer was a direct screw on fit to the focuser draw tube?

Unless that's not the case with the older blue tube ED80? If so, you may need to take some length out of that setup to allow a touch more in focus, also check the flattener to camera chip distance is correct.

[Grierson]

Try Removing the ring on the end of the focuser and screw the flattener directly on to the tube. It MAY give you the extra mm but that approach will also provide a more secure connection free from movement. - John

[Grierson]

2 minutes ago, parallaxerr said:

Marky beat me to it, I thought that reducer was a direct screw on fit to the focuser draw tube?

Unless that's not the case with the older blue tube ED80? If so, you may need to take some length out of that setup to allow a touch more in focus, also check the flattener to camera chip distance is correct.

Ditto 

[newbie alert]

39 minutes ago, Marky1973 said:

Can you not screw the reducer directly to the focuser tube? That's what I do, I don't use the nosepiece. Might give you a few extra mm - never had a problem with thatsame set-up, minus the nosepiece.

Id rather do that,and would give me the extra inward travel..what adapter do you use for that?..i take it you screw into the first part of the focuser as the second part is a push and secure with the thumbscrews

[parallaxerr]

The part with the thumbscrews should unscrew off the focuser draw tube, leaving a male thread onto which the flattener screws directly...provided you have the standard focuser?

[newbie alert]

40 minutes ago, parallaxerr said:

Marky beat me to it, I thought that reducer was a direct screw on fit to the focuser draw tube?

Unless that's not the case with the older blue tube ED80? If so, you may need to take some length out of that setup to allow a touch more in focus, also check the flattener to camera chip distance is correct.

Where would i find out the correct distance?

[Marky1973]

1 minute ago, parallaxerr said:

The part with the thumbscrews should unscrew off the focuser draw tube, leaving a male thread onto which the flattener screws directly...provided you have the standard focuser?

Yep! +! :-)

[parallaxerr]

If you have the standard focuser (not necessarily the exact one pictured here), remove all of the black parts cirled here and the flattener should have a thread that fits right on

[parallaxerr]

5 minutes ago, newbie alert said:

Where would i find out the correct distance?

Good question, to which I can't find the answer. With my MPCC it was 55mm but I think if you have a standard T-ring between the flattener and the camera, you should be fine.

[newbie alert]

If i unscrew the 2 thumbscrews i have a tube without the thread,hense why i thought i needed the adapter..or are you talking about the one right on the focuser tube?

[newbie alert]

Im at work so i cant look until i get home..thanks for replies

[parallaxerr]

Yes, the whole black asssembly into which the thumbscrews are fitted can be removed. It may be tight as the knurled part towards the objective end is a locking ring. You should be left with nothing but the silver draw tube with a male thread.

EDIT: the adapter is only required for aftermarket focusers that do not have the SW thread, in which case you can use the nosepiece adapter inserted and retained by the thumbscrews, like a diagonal.

Found this photo with all but the locking ring removed.

 

[newbie alert]

Great...if it screws directly on then id much prefer that...

Thanks all for info..i have a play when im home from work

[newbie alert]

Thanks for your replies,much appreciated..yes it fits..just need some clear skies to test it out...