5 replies to this topic

[wolstan dixie]

The central focussing is really gunged up and can hardly be moved, I need to clean and re-grease the central focussing mechanism. Removing the eye pieces and their arms is easy enough, but I can't for the life of me see how to remove the focussing mechanism. I am not going to touch the internal optics which look fine. There is a circular plate with the serial number at the other end which doesn't have any obvious way of removing it, and anyway perhaps that is not required?

 

Any help appreciated, thanks

 

[John A Roberts]

Well I can’t tell you how, but it is of course possible . . .

 

See an image provided by trancework on BirdForum: https://www.birdforu...em-8x30.318198/

Hopefully someone will contribute the know-how

 

 

John

Attached Thumbnails

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Edited by John A Roberts, 03 March 2021 - 06:34 AM.

[wolstan dixie]

Well, that's interesting, he seems to have extracted the whole focusing mechanism as one unit, and not actually separated the threaded bits.

[Ant1]

Hi

 

No need to remove the serial number plate.
Once the arms of the eyepieces are off the spindle, just turn the wheel counterclockwise, once the threads are disengaged, just pull the focuser out.

 

Regards

Ant1

 

[wolstan dixie]

OK problem solved.

 

In not wanting to disturb the optics I hadn't lifted the eye piece struts away from the focusing pillar. When I did so I discovered the lower one had a locating pin which prevented the outer focusing cylinder from turning. With the struts swung to one side the outer focusing cylinder can be unscrewed and then just pulled out - though with 80 years of congealed grease it required a strong pull.

[wolstan dixie]

Ant1, yes not having read the above, I discovered it for myself!

 

Still thanks - I might not have!