How do i adjust Megrez 90 Focuser Tension?

[milan]

As per title, setup for my first ever imaging session and pointed at Vega to obtain focus and my 5D is heavy enough that the focuser extends fully. I cant for the life of me work out how to adjust the tension on it?!?

The internet seems to say you can but i cant find instructions!

[skye at night]

Not sure if the 90 is the same...

but on the underside of the WO66 is a small allen key grub screw type thing that needs to be tweaked to increase the friction.. remember this is mainly how a crayford works...

There should also be a locking nut somewhere.

The 5D is a heavy beast though and you may get some flexure anyway, depending on lengths of ext. tubes and solidity of attachment.

Steve

[milan]

Grrr, just found it. Damn screw was hidden under the Quality control sticker! no wonder i couldnt find it!! LOL

Sherlock holmes to the rescue!

[ollypenrice]

Are you sure? On the 66 the main tension control is under the focusser. It consists of a small back finger wheel (which serves as a lock nut) and withn it a small allen screw. You slacken the finger nut, gently add pressure by tightening the allen screw a little and then hold that setting wth the key while you tighten the locknut. As usual with locknuts the effect of tightenening them is to pull the screw back up a little so reducing the friction.

The other relevant adjustment, which helps stop the drawtube sliding, is to add a little pressure to the friction pads usually via little domed allen bolts.

Olly

[milan]

Yep definitely then allen key bolt on the underside of the telescope. Put the camera back on, tweaked a little and hey presto it no longer moves under the weight of the camera.