Quote:
Originally Posted by spacetff
Hi Astro744 so looks like it is the dust seal do you normally leave these in or out when using? I do mostly visual and only just startig to learn AP.
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I have never used one and don't know how many others have one or use it often. It is a good idea if you observe in remote dusty locations especially if the wind picks up as you can change accessories after the rear cell without dust getting inside the telescope. The front corrector will likely collect as much if not more dust but at least it can be cleaned from the outside without dismantling the telescope (dismantle NOT recommended). Proper cleaning instructions need to be adhered to for front of corrector.
If in position it will ever so slightly reduce the light throughput, perhaps imperceivably. The test for this is to observe faint stars or galaxies at the limit of detection with and without the filter in place.. It may also vignette if the clear aperture of the filter is less than the rear cell opening but again this may likely not be perceivable.
