Phillyo

Does the little Redcat 51 tick the box for you? That's 250mm focal length so might be too wide for what you're looking for?

Phil

50 minutes ago, scotty38 said:

This is a great image but to answer your question on sub length then, for me at least, I would say storage and processing of 1800 subs would be the downside. I would still end up with 3 hours of data just fewer subs to deal with and yeah I get the issues of losing longer subs, the need for guiding etc etc so I'm only really comparing the pros and cons of sub length - if you see what I mean....

Oh absolutely, total combined exposure time is key. I'd rather deal with fewer 5min subs than more 10 second subs for sure. Just impressive the level of detail collected from such short sub lengths.

It's bonkers you can get so much detail from just 6 second subs. It makes you wonder about the need for 5min or 10min subs. Great images, this and the crescent nebula are both gorgeous.

Phil

That's a really nice setup! Roughly where in Lincolnshire are you? It would be lovely to pop round sometime and see how you have everything connected etc. Feel free to private message if you want, or if you'd prefer not to, just in case, that's also cool!

Phil

Very nice image! I've just bought a Redcat 51 and I'm also in Lincoln so I'm looking forward to seeing what I can get with this combo

Phil

I already use a Mini PC and it works fine, I love it. I was just curious about the ASIAIR type of ecosystem more than anything else. It is very handy

I'm just curious as to why there are no other manufacturers making something similar, especially one that is open to ALL cameras/guiders etc rather than being locked to a single ecosystem. It seems that they are very popular (I liked mine while I had it) but are let down by locking people into using only ZWO equipment? Or have I missed something

Phil

23 minutes ago, Alien 13 said:

I think the framing is perfect, a nice portrait of an Alien..

Alan

You're not the first person to tell me that! That's the first thing my Mrs said when she saw it lol

Located in the constellation of Auriga, the Flaming Star Nebula (IC405, SH2-229 or Caldwell 31) is approximately 1500 light years away. The Tadpoles (IC410) are located at approximately 12,000 light years, so despite looking like neighbours, these two are not.

Captured with the Samyang135, Risingcam IMX571c, Antlia ALP-T 5nm filter, EQ6r Pro, NINA, PHD2. Processed in Pixinsight. This is approx 14.5 hours of data. I'd like to have rotated the camera/lens 90 degrees for better framing but it's a faff so I didn't bother  

Thanks for looking.

Located in the constellation of Auriga, the Flaming Star Nebula (IC405, SH2-229 or Caldwell 31) is approximately 1500 light years away. The Tadpoles (IC410) are located at approximately 12,000 light years, so despite looking like neighbours, these two are not.

Captured with the Samyang135, Risingcam IMX571c, Antlia ALP-T 5nm filter, EQ6r Pro, NINA, PHD2. Processed in Pixinsight. This is approx 14.5 hours of data. I'd like to have rotated the camera/lens 90 degrees for better framing but it's a faff so I didn't bother  

Thanks for looking.

Possibly, but you should have removed those frames from the set before stacking the data no?

Just wondering, how do you guys rotate your lens and camera to get the correct framing of your target? Or do you just set it and leave it and hope for the best? Any tips/tricks for easy rotation and framing?

On 15/01/2023 at 12:37, StuartT said:

I've just discovered the SNR script in PI and so naturally I was curious about my images. A recent colour sub measured at 28-30 dB (depending on channel). An integrated result measured 38-40 dB

What should I be considering a good SNR? (40 dB is 1:10 000 which sounds like it's quite good for SNR?)

Thanks 

I've just done the same on a single sub and 15 hours of exposure stacked. Difference is 25db for single sub and 49db for 15 hours? Whatever that means!

Not a clue

It looks like your focus is slightly off, I'd work on getting accurate focus first. Leave gain and offset to defaults, not much to be gained by changing them really.

Just now, barbulo said:

Perhaps this one?

Yes, that one. Thank you

1 hour ago, Elp said:

How did you modify it? When I use my o3 filter the stars are awful (too close to sensor somehow) but adding spacing, even like 1mm means the focus is beyond the stop and I can't focus.

 

I followed a youtube video on modifying the backstop. I added it to another post somewhere else on the forum where Olly was making a new Samyang rig if you can find that? I'll see if I can find it for you. It's very easy to do.

10 hours ago, Elp said:

Mines barely a 10th or 12th turn from the stop. Different filters changes this but still pretty near.

Mine was so close that I couldn't actually achieve accurate focus with one filter, that's why I had to modify the lens a little bit. 

This looks awesome! I'm currently capturing the same area but slightly wider with the Samyang.

4 hours ago, Gonzo said:

ok thanks, but where is your focus mark? As in, when you've achieved focus, where is the mark on the lens?

Ah, well it varies depending which filter I have in. However off the top of my head I don't know lol, I'll check tomorrow when I cover it up again. I use an EAF with it so I never really notice/care any more. Sorry!

Peter, question if I may. When you take images like this of comets, do you just slew to it and track the sky using sidereal rate as normal or do you need to have the telescope track the comet instead? I'm assuming if you're only taking lots of short subs then normal sidereal rate will be correct but I have no idea as I've never taken a photo of a comet before and I'd like to give it a go tonight.

Fantastic image!! Love the detail in the tail of the comet.

This is a widefield view of NGC2264, the Cone Nebula. It's forms the top part of a two panel mosaic I'm working on to try and incorporate the Rosette Nebula too. I need more time on the bottom panel though, only 8 hours so far.
This is 15 hours of data shot in 3min subs through my Samyang 135@f3.4 and my Risingcam IMX571 camera, through the Antlia ALP-T 5nm Dual Narrowband filter.
There's a LOT going on in this area, as you can see in the starless version. I'm very tempted to keep adding to this and see how much more I can bring out? I've left the background fairly light here to show the faint details around the main nebula but it does mean there's a little more noise present in the image too.

Phil

On 12/01/2023 at 12:09, Gonzo said:

For those of you using an OSC camera on this lens, where is your focus mark on the lens scale?

I had to doctor the lens and remove the hard stop to achieve accurate V-curve via autofocus.

Thank you both. I'm curious as to what that large O3 looking bubble is at the bottom left of the image? Astrobin platesolve hasn't given it any kind of identifier.

This is a widefield view of NGC2264, the Cone Nebula. It forms the top part of a two panel mosaic I'm working on to try and incorporate the Rosette Nebula too. I need more time on the bottom panel though, only 8 hours so far.

This is 15 hours of data shot in 3min subs through my Samyang 135@f3.4 and my Risingcam IMX571 camera, through the Antlia ALP-T 5nm Dual Narrowband filter.

There's a LOT going on in this area, as you can see in the starless version. I'm very tempted to keep adding to this and see how much more I can bring out? I've left the background fairly light here to show the faint details around the main nebula but it does mean there's a little more noise present in the image too.