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I've got one, and use it when imaging with my 25". Getting it set correctly is a bit of a faff, and in my case involves using a second dbk31 camera and the adc tool in firecapture. The fact that there is a noticeable change in the dispersion effect on screen when setting it up was enough to convince me it was a relatively small amount of money well spent. I have yet to use it on my equatorially mounted scopes though, and I suspect the fiddle factor will make it less appealing as the orientation changes.
Regards
Andrew.
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