I tried asking this question in the Cat forum but didn't get a response. Does anyone here know?
Thanks in advance.
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Posted 11 January 2017 - 01:09 PM
I don't think it would make a difference
(I never noticed a difference with my C8),
but it would be simple enough to test it out at different positions and see if you get a better view
at one of them with your scope.
Posted 11 January 2017 - 02:37 PM
Thanks for the response, George. I'd like to experiment with it but the Sun won't cooperate by producing an AR. Wouldn't matter anyway--cloudy forecast here through next Tuesday...
Posted 12 January 2017 - 06:13 AM
I’m not really a solar observer but I use a 6” off-axis (clear) mask/diaphragm with my 16.3” scope on occasion for other objects and not found an optical issue.
However for your solar-mask pursuits I wonder about how much (if) the sun would heat the opaque area of the device – thus possibly rising thermals across the filter in some instances....(the 9 to 3-o-clock positions ???) – so perhaps a 6-o-clock position might be in order.
Or wind-directed thermals might be the factor to consider/address….?
Just my speculations on the matter…….
Posted 12 January 2017 - 08:54 AM
Thanks for the thoughts. The opaque part of the filter is white so it should reflect away a lot of the Daystar's heat but probably not all. It makes sense to keep the filtered opening at the bottom (6 o'clock) of the objective. Good to hear from you.
Posted 12 January 2017 - 02:40 PM
I don't think you will see any difference. With a blank sun you will get an easier full disk with your 50mm scope.
Posted 13 January 2017 - 06:53 PM
Thanks, Mark. You're probably correct. As far as seeing the full disk, I have other telescopes (and my 15x70's) for that). My 2" ep's give me very close to a full disk, but I am more interested in a high power view with the C14.
As luck would have it, a (sort of) break in the clouds this afternoon coincided with the emergence of AR2625 so I was able to try out my new off-axis filter. It worked great. Sketch can be seen here.
[Edit: AR2625 is now followed by newly designated AR2626 ]
Edited by Special Ed, 14 January 2017 - 10:35 AM.
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