AbsolutelyN

17 minutes ago, gorann said:

Yes, probably easier for me than trying to fix the tilt. Very small margins at f/2. Are your elongated stars in all corners? Maybe your chip distance is a bit off?

I think the distance is very close, possibly just a bit of tilt in one corner. Two images attached of each corner, just quick crops from raw stacks.  Happy with the HA but LRGB filters are never as good. All Baadar 2" filters.  

RGB


HA

15 minutes ago, gorann said:

Thanks! Yes, my stars were also elongated in some corners probably due to minor tilt (not chip distance since one corner looks good). I simply fixed them with an old trick in PS, took 20 minutes. The way I did it was to make a duplicate layer and then in blend mode Darken move that top layer with the arrow keys until I get round stars and use the brush tool on the layer to apply only in the affected area. Have to do it separately for each side or corner as the elongation was in slightly different directions.

Thanks Gorann, that's a nifty little trick. Not come across that one before - just tried it and work really well. Love the power cable trick too.

Fantastic image. How have you got the stars so pinpoint at the edges on APS-C? I can't get them that good even with my 1600MM. 

Clouds of dark nebula swimming through the background stars of Cepheus. 7.2 hours with RASA 8 + ZWO 1600MM Pro (with RGB filters). 
Higher res on AstroBin

No. Sony lenses need to be much closer to the sensor than canon lenses. You can adapt Canon to Sony but not Sony to canon. 

I picked up a second hand Canon 6d late last year and got it modified with the intentions of using it for astro landscapes. Not managed that yet so decided to piggyback it on scope and see what it gets. Lost an hour of exposure time last night due to clouds on our still very short nights - this is just over 2 hours with Canon 200mm 2.8ii.

I use the Canon 200mm 2.8ii on full frame and am getting good results from it, though I stop it down a bit to f3.5 or f4. Never used the Samyang 135 but am very interested in the lens. Have bought Samyang once before and had to send it back as elements were clearly misaligned. Anyone know if they have improved their quality control or do you need to send back X number of copies to get a good one?  

10 minutes ago, gorann said:

Had another go at it this rainy day and I think it improved from my previous versions, but maybe I should have had some 8% IPA like Ciaran when he processed his excellent version🍺

Looks amazing! 

16 minutes ago, nfotis said:

Very nice, so it fills the frame with a 200mm lens, or did you crop?

I have a 70-200/2.8L IS  and a 400mm/5.6L lenses, and I would like to make an attempt at it, but the lack of a mount and the light pollution here in Athens are a major impediment...

 

N.F.

It has a very slight crop but not much, it pretty much fills a 200mm frame on full frame. This is taken in Bortle 5 skies and it never really gets properly dark here.  You can use short exposures to avoid star trailing to some extent - this is a stack of 4 second exposures but it was on a badly aligned tracker. Experiment and find what focal length you can get away with. 

1 minute ago, Craney said:

Great detail in the tail.

Crimple Valley viaduct by anychance ??

Certainly is! It's only 10 mins or so walk away so tend to photograph it a lot and has slightly bit darker sky. 

This is (so far) my best attempt at the comet taken last night. Sky was hazy and not really very dark (@ 1am - 2am). It's 69x 20 second exposures (800iso) with Canon 6d and 200 2.8 lens. Stacked in Pixinsight with CometAlignment and then stars added back in Photoshop.  Not used to working with DSLR images ... seems much harder

 

And this is comet through the arches of the Crimple Viaduct 

A few more with viaduct on my website if anyone is interested.
https://www.tristancampbell.co.uk/blog/2020/7/comet-neowise-in-the-crimple-valley

Brilliant, superb image!

Not an app but I find this site brilliant to keep an eye out for showers when the weather is not perfect:
https://www.netweather.tv/live-weather/radar

I've had issues with specific cables. I've always put it down to using very long usb3 cables between scope and pc. I've recently started having far fewer issues by ditching usb3 and using the 1600pro with usb2. Good luck.

I thought it was a starlink pic on first glance! Contact Firstlight, sure they'll sort any issues. 
Mine has been running at almost 80% on cooler for last two night to get to -20, no issues. Perhaps try switching USB cables.  

The recent clear skies gave me the chance to try a mosaic which only tried once before and only in B/W so this was a bit of a challenge to capture and process. This is a two frame mosaic of M81/M82 & Surrounding IFN. Each frame is approx 13 hours in LRGB so approx 26 hours in total. Taken with ZWO 1600MMPro and Rasa 8. 
https://www.astrobin.com/s9uean/

Just caught it as it came over the horizon, lovely colours.  Esprit 100 + Sony A7R3

1 minute ago, Adreneline said:

I really like that - very edifying. How extensive is this region of IFN? Are regions of IFN catalogued/mapped anywhere?

Thanks for sharing - very inspiring.

Adrian

 

Thanks Adrian. Polaris is surrounded by IFN - try search Astrobin and you'll get various widefield images showing how extensive it is. 

This is a small area of integrated flux nebula (IFN) near to Polaris. I just love the jellyfish like structure, it makes me think of some strange sea creature swimming through the depths of a dark ocean.
Taken over several nights during our first clear spell of the year here in the UK.  15.6 hours with RASA 8 and ZWO 1600MM and Baadar LRGB filters
AstroBin: https://www.astrobin.com/brxgyw/

Thanks Adrian. This is just to the left of the Orion Nebula. I'd hoped to get a lot more data but don't think there is any more time until later in the year so may revisit this one. 
Very impressed with the RASA, but also very hard to get good stars into the corners. Similar to working with fast lenses I guess.  

Finally managed a few hours of imaging. 4.8 hours with ZWO1600Pro, RASA8 and Baadar HA filter. 

Higher res on Astrobin:
https://www.astrobin.com/n94x8c/C/?nc=user

Regarding scope covers I recently bought this from amazon. It's huge, too big really, but works rather well for an emergency cover for fully setup mount + scope. Just use a few bungee cords to hold it in place. It will cover my az-eq6 with height extension + rasa + me underneath too 🙂 

https://www.amazon.co.uk/gp/product/B07MNJVPJK/ref=ppx_yo_dt_b_asin_title_o05_s00

31 minutes ago, Nikodemuzz said:

Looking quickly it seems that there is less color noise in the latter, "darkless" image, which is interesting. Hot pixels are still there in both images, should they not have been removed during the stacking/calibration? Well, I am by no means an expert here, I'm sure the more experienced users will be able to help.

It's very possible not getting it quite right yet ... 

21 minutes ago, AbsolutelyN said:

It was dithered too .... set to medium in SGP. Not sure how many pixels that is but will reprocess as you say as an experiment. Thanks  

Thanks Michael .... just ran it through BPP with bias as darks and have to say I can't tell any different to the one with matching darks. 

1 minute ago, michael8554 said:

You might try Dithering 12 DSLR pixels, no Darks, use the Bias as Darks. 

Michael 

It was dithered too .... set to medium in SGP. Not sure how many pixels that is but will reprocess as you say as an experiment. Thanks