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billyharris72

How to interpret field curvature? [ED72 + OVL]

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3 hours ago, Skipper Billy said:

Hi Neil,

What ID are the spacers you need - I have loads of Delrin spacers from 0.5mm, 0.75mm and 1mm - PM me your address if you would like them. (FOC).

Thanks, a generous offer!

42mm - but to be honest I  have a well-equipped workshop so once I have the right spacing I can make my own permanent one. Save your spares for someone not able to do so.

This is my latest -  still off-centre, but stretched in all four corners.

180434832_GarnetTrunk.thumb.png.bd9ab9bb4ed2a56d98d1e68786bb32c5.png

P.S. - I've just checked a Ha sub of the veil and it appears that the corner most affected in previous images is OK with a printed 1mm spacer, but of course the camera is not in the same orientation, so we will see...

Edited by Stub Mandrel

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Looks like a spacer has made a big difference.

Before:

image.thumb.png.54f6f1b6bc3b5bc6164bbfba84acec65.png

After:

image.thumb.png.65664860af9cd126edf0c291e6a48cc7.png

Although the difference looks modest the difference in the appearance of stars is huge with the 1mm spacer. I will try adding another 0.5mm next time.

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