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DUSTCOVER??


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I have always wondered about the blanked apperture myself but the capped one I use sometimes on the moon (takes away some of the glare) and a lot of people use it for attaching a solar filter and observing the sun. I could be wrong but doesnt the reduced apperture affect the f ratio?

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I believe it is a historical thing that isn't used anymore.

one thing i found though is if you leave the big one on and just take off the small one when looking at the moon you get a more comfortable view as it dims it somewhat. (haven't got a moon filter yet)

Hope this helps?

chris

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