Astrodon 1.25 filters in a ZWO filter wheel.

[Adam J]

Is anyone using astrodon 1.25 inch filters in a ZWO 8 position filter wheel? I ask because a friend got some and his manual ZWO wheel will not rotate with them in place. He says they are thicker than his other filters? 

[DaveS]

I don't have the 8 position wheel, but my Astrodons work OK in the 5 position wheel.

[Adam J]

Ill know come tomorrow, my friend is lending me a filter to see if it fits. There are some reports of problems with the 8 position wheel and astrodons on cloudy nights.

[DaveS]

That's useful to know, I had thought the inner dimensions were the same. I was thinking of getting an 8 position wheel so I could load up my full set, LRGBHNOS.

[Adam J]

14 hours ago, DaveS said:

That's useful to know, I had thought the inner dimensions were the same. I was thinking of getting an 8 position wheel so I could load up my full set, LRGBHNOS.

The result is that it fits but with literally zero tolerance, but no scraping. From the reports I am guessing someone got unlucky with a bellow tolerance wheel and an above tolerance filter as I am guessing 0.1 - 0.2mm clearance at most.