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RE: H-Alpha and prominences

How does using a filter make more light visible (Prominences are not visible in normal white light)? Are they blocked out by the intensity of the disk?
It doesn't. What the filter does is transmit (most of) the light emitted by the prominences, whilst absorbing or reflecting (almost all of) the light in the sky background - which is very bright indeed close to the sun.

Read more : RE: H-Alpha and prominences | Views : 1398 | Replies : 3


what the hell is noise pollution in astrophotography terms!?!?
Read more : astrophotography... | Views : 1332 | Replies : 2


hi,could you tell me if right ascention(ra) 0hrs starts in the northern sky throughout the year and does it move.
can you tell the time of night by ra?dave.
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