Dust filter for SCT ??

Was wondering if I should invest in a dust filter for the rear of my C8 ?? Has anyone used one? and can give any feedback on if in fact it is really needed. I have a 2" visual back & a shorty TV Everbrite. I leave the cap in the center of the 1.25" adapter when not in use.. Thanks John M

I use one and it actually helps with seeing too! I have had many a person say they tought it help to see through the air. It also helps keep the dust out. Still get some from around the corrector plate , but much less than what gets in each time you pull out a EP and open the tube to the air.
Floyd

I disagree! I have had many a person look through my scope on a not really good night and ask what filter I was using! I would show them the Skylight and they would ask if they could try it on their scope. They all seemed to think it helped, so I am willing to believe it does. It sure doesn't hurt to have the back sealed all the time. Dust does come in through the diagonal into the tube. Try cleaning you diag with air or whatever you use so it is dust free. Go out for the evening and when you get back take a look at the digonal mirror. My bet is it will be covered with dust. That dust will migrate into the tube and will cause you to have to clean more ofter if nothing else.
This is only and opinon! Flame suit is on! :^)
Floyd