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About Endolf

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    Star Forming

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  1. Finally managed to get enough data on my baby scope to call it an image. This is about 8 hours of narrowband data around the SH2-157, there is quite a lot in of objects in here. This is the first image from my SharpStar 61 EDPH MKII that I got a few weeks back, the first time I'm using astroberry (as opposed to my normal stellarmate), first time with an APO, first time using the ZWO EAF. The EAF needs more tuning, especially in the OIII it's not a reliable process yet, I often have to run it a couple of times to get it to play. My guiding wasn't playing nice last night (the second of the 2 nights gathering data), not sure if my PA was off or if there was some other reason for it. I'm pretty pleased with the blue on the lobster, I think I could do a bit more on the bubble, but I need to be careful about going too far. 42x180s Ha 60x180s OIII 60x180s SII Drizzled with droplet 0.5 and scaled 2x, calibrated, stacked and combined in APP, post processing in PixInsight. Full details and higher res are on Telescopius
  2. I only use it for polar alignment, but it wouldn't run this evening for me after the update to Android 11 today.
  3. So, this is part ramblings and part warning I got myself a new scope (SharpStar 61 EDPH Mk II), with the reducer/flattener in place the back focus is different to what I had adapters for before when using my newtonian with a coma corrector. So had a look at some options and ordered a Omegon M42 to M48 adapter that said it only added 2mm to the optical path, and then an SVBony set of extensions to build it up. The SVBony M48 extension tubes arrived first, I quickly discovered that the threads on the extension don't quite work with the M48 threads on my baader MPCC. Weirdly, they work fine with the ZWO M48 adapters, and the male M48 thread did screw in to the MPCC, I'm guessing the SVBony adapter is right on one edge of tolerance, and the MPCC the other extreme. Then when looking at one of the other SVBony extension tubes I realised that the threads are not cut very deep, so it wouldn't screw on to the new scope's flattener/reducer far enough. I ordered some Altair extensions. The new extensions arrived and all was looking good. This morning the M42 to M48 adapter arrived. Set up for one scope and it all looked good. The extensions needed for the other scope are different, but the M42 to M48 is the same, when I tried to swap it over I couldn't get the adapter off of the extensions. I eventually managed it, but the outside had got scuffed up and the extension was bent out of shape. I'd had to apply heat too. So one of the extensions trashed, but I did manage to get it off eventually. So then I tried the other setup. All was looking good till I measured the back distance an discovered it was 5.5mm too long. The sums all worked out, but measuring it didn't. I found out the M42 to M48 adapter added 7.5mm to the optical train, not 2mm. I hunted around online to see what adapter and extension tubes were around, it took a while, but I eventually realised that if I machined 1mm off the adapter, I could use extension tubes from off the shelf. Luckily, one of my other hobbies is miniature steam locomotives, so I have a little workshop. I took some images, from problem, to solution, to result.
  4. That would be good. Thanks. I'm having troubles finding what looks best across 2 operating systems on the same PC, let alone on different PCs with different screens...
  5. Hi Wondering if anyone has had any of their images printed, I've had a request to get one of mine printed (I know, came as a surprise to me too....). I've never had any photo printed, let alone at 16"x12" size, and certainly never any of my astro images. Wondering if anyone has any guidelines, or places they'd recommend in the UK? Thanks.
  6. Yup, also thought about the little QHY 30mm guide scope, for now I'll be using what I've been using on my 8" newtonian. The plan is to eventually build up a second, lighter rig, but for now I've just got the APO so will have to swap everything back and forth depending on the target.
  7. Here it is, I've attached my existing ASI1600MM Pro Cool and guidescope. It's at an odd angle so the guidescope looks slightly larger than it should, but as the guidescope is 50mm and the new scope is 61, there isn't a huge amount of difference
  8. It's arrived this morning :), I got the reducer too for 275mm focal length, now for some more cloud......
  9. I'm not sure I'd ever want starless as a final image, I think it makes for an interesting exercise, and I think that removing the stars, processing the nebula (or other target) and then adding the stars back in later is not really much different to creating a star mask and processing the image around the stars. Another tool in the box rather than a magic bullet. As for my images, I've only been doing this since February this year and I'm still on a trial for PixInsight, so I know full well that I've a lot to learn on processing
  10. The F ratio is useful for gauging how long it will take to gather enough photons for the frame being shot. The key is that the f ratio doesn't tell you which part of the ratio has changed. If the target you are shooting fills the field of view of the camera combination with say a 1000mm focal length and say 200mm aperture, then shooting the same target at 200mm aperture at f4 will mean the target is smaller on the sensor, if you then crop and upscale to produce the same final image, then you've just lost all the extra photons. If on the other hand, you go to 1000mm but with an f4 (increasing the aperture rather than reducing the focal length) then you will be gathering more photons on the same target.
  11. I thought I'd have a quick play with the latest pixinsight with starnet plugin to see what would happen. These are all just taking my final jpg images and applying the processes. I *think* the better approach will be to remove the stars after the early stretching is done, then do the rest of the processing and then add the stars back in right at the end.
  12. Ekos on StellarmateOS on a pi 4gb. I use it because I wanted something I could leave out with the rig that wasn't my laptop. I also liked the idea of being able to use the rig away from home without requiring a large power supply, the pi + mount etc use enough without adding a laptop, so being able to control the rig from my phone seemed like a nice feature. I'm also an advocate for open source, so other than the mobile app part being proprietary, the rest being open source appealed to me.
  13. Ooh, that's interesting, not seen them before. They do some nice fast newts too :). Seems to get some good reviews if used with their own reducer/flattener. Thanks
  14. Hi So having got the 200/1000 newt up and running earlier this year I've been happily imaging at 1000mm. I'm looking at adding a second scope to the mix and a wider field. I started looking at the WO Zenithstar 61 with the 0.8x reducer/flattener. This would give me 288mm at f4.5. This seems to frame up some of the larger targets quite nicely (M45, M42, M31, Heart and soul etc) and at f4.5 it's also a bit faster than my newt. My plan is just for an additional scope at this point, so still mounting it on my EQ6-R pro with the ZWO ASI1600 + filter wheel and also reuse my guide scope/cam. It turns out the 0.8x reducer is no longer available, seems some people have found issues (I don't know what) and WO are looking at it, so I was wondering what alternatives are available. The ZWO redcat 51 is an obvious example, it's even wider but slightly slower, are there any similar quality, similarly priced scopes that people can recommend? Thanks
  15. Thanks @AstroRuz, I found this really useful. I've developed a different way to do the star selection, but having the information to start with was invaluable.
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