Allinthehead

Beauty, I love those dark areas in IC 1396.

Great result, looking forward to seeing what can be done with that sensor. I wonder will we see Atik bring out a camera with the imx571 in it.

Lovely colours and detail. I just tested a 3nm ha filter and no sign of any halo even on Alnitak.

Very nice Brendan, as you said more luminance data will sort out the noise, well worth continuing on this one.

I managed to pick up a second hand 3nm in the for sale section here. I know that 3nm is not ideal at F/3.3 but I was looking for a filter that would work well under moonlight. First I wanted to check a bright star for haloes so I went for Alnitak. All looks good here I think. After watching the Hoys Stargazine episode I wanted to make a contribution so I slewed to the Rosette Nebula. I had to shoot though gaps in the clouds but still managed to get 32 300 second subs. Shot through an Epsilon 160 with an Asi 2600mc. Gain 100. Processed in APP, PS and PI. Overall very happy with the filter and with how the colour camera has done with it. Starless for fun. Bayer Drizzle

Really enjoyed that and I've just registered. Hoping to get some Ha data tonight.

I was lucky enough to pick up the 3nm Antlia Ha second hand and it arrived yesterday. Looking forward to trying it on my 2600mc.

Mine also looks identical to those posted above, no sign of the pattern in my final images.

https://www.takahashiamerica.com/blogs/technical-support/camera-systems-and-back-focus-untangling-the-gordi/ Afaik it's from the broad flat surface.

Congrats on the new camera. Just fyi, the backfocus for the Epsilon according to Takahashi is 56.2mm.

Thanks Andrew, I'm aware of the fast filters too. What I don't like about them is the wide band pass and I'm looking for a filter to image when the moon is about. I have a second hand 3nm on route to me and i'll give it a go. If it proves problematic I'll sell it on and go for one of the high speed ones. Nothing to lose, I had a look on Astrobin too and noticed some great images shot at F/3.3 with Astrodon 3nm.

Thanks for that, funnily enough I had already read that thread a few days ago.

Is the Edit button gone? Found it🤣

That clears it up for me thanks Vlaiv.

I actually find those small spikes quite attractive.

In my search for a Ha filter to use with my Epsilon 160 it got me thinking about my scope and whether it really is an F/3.3. It has a 160mm primary mirror and focal length of 530mm giving a traditional focal ratio of F/3.3. FL/Aperture=FR. Can anyone explain to me how the central obstruction fits in this calculation? Secondary obstruction is 63mm or about 40%. Regards, Richard.

I used to own the 1600mm and it was awful for that issue. So much so that I just had to avoid any bright stars. AFAIK that Panasonic sensor is the only cmos sensor to suffer this issue, open to correction of course. There're also CCD's that suffer micro lensing artifacts but none seem to be as bad as the Panasonic. Richard.

They do look a little fuzzy, maybe you're over exposed at 300 seconds and gain 100. I find my fwhm drops significantly at gain 0. I had similar fuzzy stars in this image, 240 seconds at f/5.5 Never got to the bottom of it as I bought the Epsilon soon after.

👍 Nice, will you tag me when you get to test?

Wow that's a cracker and from Bortle 8 in only 3 hours

That's a very fine first. You must be pleased.

Excellent mosaic, Samyang 135 delivers again.

Wonderful image, great colour and details.

Nice first light Adam, how did you find the ha filter? I'm looking for a way to image with the moon about and as I only have a duo band filter I was considering an Antlia 3nm to pair with my 2600mc with one eye on possibly using it with a mono Imx571 in the future. My only concern is whether 3nm is too narrow at f/3.3.

Seamless mosaic Mars, beautifully done.