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Collimate a ba8


Astro_noob
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The collimation screws are under the rubber covering of the cover plate.  Accessing them and making good afterwards is non-trivial. Also be careful not to inadvertently "adjust" the nitrogen fill port :-). But, if yours are out of collimation on arrival, send them back

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I had a start on my 22x85s last night. I've exposed all of the adjustment screws OK but wasn't really able to see two distinct images to align. However on drawing my head back the left exit pupil is about 1/4 of the circle lower than the right one. Should the exit pupils be level for a start?

Sent from my GT-I9505 using Tapatalk

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Hi Stuart

Have you tried de-focusing one side? If you have the focused star within the defocused circle, the nearer the centre the better, then your collimation is ok

As far as the level of the exit pupils go, I can't say, my eyes are at different levels and one is deeper set due to a forceps birth. This adds to the variables to the extent that all bets are off.

I don't look like the elephant man, by the way.

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  • 2 weeks later...

If you have  a green laser pointer, it's worth using it, by placing it between the objectives and aiming it forward. At night, the two images are resistant to merging because the laser line appears at different angles in the two eyepieces. You are aiming to put the two end points together.

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In the end I got professional help.

The binocular repair centre in Glasgow, £60, full alignment and nitrogen topped up.

If anyone is looking, you can contact them direct or through Viking Optical who use them for all UK repair work.

Done an excellent job.

Cheers

Stuart

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