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Dr. John Kroon


I've annotated the picture, but it was taken on a night with a slight breeze through my Orion xx14g with a Canon t3i camera and a 2.5x barlow as well as a 2" tube extender. I found that I didn't have enough tube extensions to achieve back-focus, so I used the 2.5x powermate by Televue. I also used a 4.75" off-axis aperature stop to increase contrast. With bright objects like the moon, you don't really need all that aperature. Using the OAAS in between the vanes, greatly enhances contrast. I was taking 60 fps videos.

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