EAA with UHC

[AKB]

Having, briefly, tried EAA with a 7nm Ha filter, I haven't been satisfied with the signal to noise ratio achieved within a reasonable time (say, 5 to 10 minutes) with 60 second subs.  I'm sure I"ll go back to this, but in the meantime I have been trying out an Explore Scientific UHC filter (because I happen to have one already.) 

Another warm night last night, with little moon, was a chance to try this out: Hyperstar, SX Ultrastar, UHC filter, and, because I was also going for some longer stacks, I used guiding (which, I must say, works a treat with my Avalon M-Uno mount.)

Three targets (only), all 10 x 1 minute:

1. Cygnus Wall (well, some of it – terrible framing)
2. Eastern Veil
3. Crescent (poor focus here, I think: tried to re-focus without a Bahtinov mask – didn't work!)

Once again, sadly, I forgot the L-R flip required to orient the Hyperstar images...

 

 

 

 

Just by way of comparison, here's a post-processed image of the Eastern Veil (31 minutes, just stretching and a bit of star reduction, with L-R flip) which I'm quite liking:

 

 

I still feel I'm not doing well enough to grapple with colour yet.  It was a sort of resolution for this year to try and get things reasonably right in mono first.

 

[RobertI]

Your setup is working very nicely, some lovely captures. It would be interesting to see the difference with and without the UHC, but I would guess if it is a 'full fat' UHC, which blocks a lot of the visible range, then it should make a difference. I still like the sharpness and 'luminous' quality that black and white images deliver. 

[AKB]

5 hours ago, RobertI said:

It would be interesting to see the difference with and without the UHC, but I would guess if it is a 'full fat' UHC, which blocks a lot of the visible range, then it should make a difference.

Thanks very much for your comments.  Since you ask, I happen to have a test sheet on this filter.  What I don't know, is whether there's any IR block there, because the camera has none, AFAIK.  I'll try the comparison sometime.