Phillyo

7 hours ago, Stuart1971 said:

I would say that’s pretty normal, it will always be very slightly darker in the corners, well in my experience anyway…if your darks come out nice and uniform across the image then the sensor is fine, it’s purely down to the light cone entering the camera…

Ok thank you 🙂 

Good evening all.

So, I've been having some issues with vignetting using the Risingcam on my Samyang, which surprised me as it's a camera lens designed for full frame cameras. Anyway, I've just done the Sharpcap sensor analysis and I noticed that there seemed to be a bit of vignetting directly from the sensor. So I've just ran the Flat Wizard in NINA and strangely my camera sensor has a vignette even when NOT connected to any lens/telescope. Is this normal? I'd have thought it should be designed without any kind of vignette if it isn't connected to anything? Can anyone else perhaps check or tell me if they have the same issue please?

Thank you.

1 minute ago, powerlord said:

hmm doesn't look like dew - stars are sharp. what's weirder is the difference and you saying it doesn't calibrate out though. could it be reflective light and background light ? I take it you use the lens hood ? maybe try a longer cylinder extending a bit out of cardboard ?

But I never image without dew heaters tbh - summer or winter my scopes and finders all have em.

Yeah I have dew heaters on the scope and finder, plus the lens has the hood on it too. It's really strange!

And this is no moon, but also maybe no dew? Again, no calibration frames just stacked data. Very very different!!

I'm wondering if I'm getting dew forming on the sensor which is causing the vignetting issue. It's quite severe, even with flats it's still quite visible. Here's a stretched stacked image from last night (no calibration frames). This was during a full moon too. 

Just curious, people that are using this lens with an APS-C size sensor (ASI2600, QHY268, Risingcam IMX571 etc), how bad is the vignetting you're getting from your light frames?

1 hour ago, powerlord said:

you did well to get the ellusive squid in 7.5 hours. very nice. 

a scattering of stars does wonders to hide noise and gradients. I use affinity photo and James Ritsons star eater macro at 1px usually

👍

With stars  I wanted to show more details in the nebula without the stars, but you're right it does hide it lol

Another image with the SY135. 7 and a half hours of data on this with the Risingcam IMX571 through the Antlia 5nm ALP-T filter. I've remove the stars to show the structure of the nebula a bit more but a fairly nasty gradient has appeared so I need to take care of that. 

Phil

Managed to grab 7 1/2 hours on this last night, tried to do a HOO style processing and removed the stars to show some of the nebula structure a bit better. There's a gradient around the mid/top right of the image that I may try to remove when I gather more data. I've also added a tight crop of the squid just about beginning to show it's elusive face lol. A LOT more data required for that to show, especially when the moon is so high at the moment.

150 x 3min subs with the Samyang 135mm lens at f3.5, Risingcam IMX571, EQ6r Pro, Antlia 5nm ALP-T filter, NINA, Pixinsight.

Thanks for looking.

Another two nights of imaging means around 9 hours of data on the Heath and Soul nebula. I might need to add twice that to try and bring out the faint stuff that's hiding in the background!

Around 9 and a half hours of data on this target, and I'm half tempted to double that as there's some lovely faint stuff beginning to appear around the nebula in this wider setting. I've also managed to capture Abell 6 at the top and left of the frame, although is tiny and super faint too. A good target for a much longer focal length sometime maybe!

Captured with the items in my Signature and processed using Pixinsight.

Thanks for looking,

Phil.

It looks like it's my calibration files, specifically my darks, that are causing the issue. Very strange as I've only just taken them! I guess I will try to redo all the darks, flats and flat-darks again later and see how that goes.

Phil

Thank you all.

The testing continues. It isn't the light frames, so it must be calibration frames somewhere. It's strange that this is only happening with this set of data and wasn't apparently with the last set which was the same settings etc. I might take some more flats/darks, but until then I'll do as Budgie1 suggests and stack them in groups to see which is the culprit. 

I don't use bias, I use flats and dark flats with timings of around 4.3 seconds (both of them match) using NINA Flats Wizard.

Phil

Stacked them all and the banding is there so it must be present in one or more of the light frames. Now I need to find out which one(s)!

Interestingly I've just stacked them all together again without any calibration, no banding. I've stacked maybe 20 of them with calibration files, no banding...!? I'm now stacking them all again, with calibration files to see if the banding is there. If so I'm going to assume that one (or more) of the light frames have banding on the images, but not all of them.

The plot thickens!

7 hours ago, ONIKKINEN said:

What about without star removal? These kind of look like artifacts that early versions of starnet++ produced when the kernel/cell (forget what its called) size was improper, although didn't see banding exactly like this so a long shot.

I used the new StarXterminator, and although it's hard to see them, they are still visible without star removal  

Good evening,

So I've started seeing some banding on my stacked and calibrated images that have only shown up in the last set of data I collected. Could this be EMI induced? Please see image attached as an example. It shows up whether I calibrate my data or not so it's not a darks/flats issue I don't think.

Thanks!

Phil

Glad you managed to get it sorted anyway!! Hope you get some good use from it

Phil

So what do you think caused the issue Ash? Incorrect power supply from your car?

Phil

1 hour ago, beamer3.6m said:

Wow

The new camera seems to be working well!!!

Thank you. Yeah, after a few initial teething issues it seems to be performing well. I'm enjoying the larger field of view with it!  

57 minutes ago, Adam J said:

Halos are on carbon stars, there is probably a harmonic of the two primary wavelengths in the near IR that is causing IR light to be allowed through from deep red carbon stars. The scope will not correct at those wavelengths and so it's very out of focus...so not really a halo as such. 

This happens with the Antlia ALP-T 5nm filter too.

I recently bought the Risingcam IMX571 to pair with my Samyang 135 lens for a very wide field of view. I had first real light, after a couple of sessions getting it set up under questionable skies. So, below is 6 1/2 hours of data for the Cygnus region in 4min subs (I might go back to 3 min) with the samyang at f3.5. Shot as previously stated, with the Risingcam IMX571, Antlia ALP-T 5nm Dual Band filter, ZWO EAF, EQ6r Pro, captured using NINA, PHD2 (guiding issues seem to be resolved now) and Green Swamp Server. Edited using Pixinsight.

99 x 4min subs.

Two edits attached, not sure which I prefer? Always happy to get feedback and criticism on my images and editing. I also need to rotate my camera/lens a bit I think, maybe 90 degrees to fit in some of the large objects in the night sky as my current orientation of 266 degrees is very 'vertical' (no such thing but I think you'll understand) and although it works well for shooting this area, trying to get things like Elephant and Bat, or NAN and Clamshell won't work.

Thanks for looking,

Phil.

1 hour ago, Phillyo said:

Good morning all.

I'm now using this camera and it all seems fine, however I'm having issues with the flats over correcting and I can't figure out why. My flats and flatdarks are both around 4.3s long, using 50 of each. Yet when I calibrate my lights with the flats (or master flat) I get a large over correction. Any ideas? 

Phil

Ignore this. I've fixed the issue by retaking all my dark library frames again. I assume I had some gain or ofset setup differently. Seems to be working ok now  

Good morning all.

I'm now using this camera and it all seems fine, however I'm having issues with the flats over correcting and I can't figure out why. My flats and flatdarks are both around 4.3s long, using 50 of each. Yet when I calibrate my lights with the flats (or master flat) I get a large over correction. Any ideas? 

Phil

Just an update, I ended up going whole hog and getting a Pegasus Pocket Powerbox Advance, along with a 12v ac to dc converter and the EQ6-r Pro cable so now everything goes through that. Guiding is perfect, I'm getting around 0.5" RMS and I could probably get better with a more accurate align and fiddle with some settings, but tbh it's more than good enough. So thank you, it seems it was the cable/power.