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  2. From the point of view of testing just the lens surely it would be better to use the simplest imaging train, no filters and no long exposures like 30 seconds should be adequate. Otherwise any number of the other extras could be adding issues to the image.
  3. Last night was clear in SE Essex, but I nearly didn’t go out, not long past full moon and the lingering twilight. However I’m so glad I did because it superb for double stars. The highlight for me was Zeta Herculis ( Struve 2084 ) the SW star in the keystone. I had two scopes in use, my OO 10” Dob designated 1/4 wave, and a new to me OO 8” VX8L, designated 1/10 wave. I’ve had many unsuccessful tries at splitting Zeta with the 10” and last night was no exception. Last night the seeing was so good that I tried magnifications that are usually pointless. With the 8” at 300x and then 400x I got a lovely clear pin point split. Bit of a challenge hand tracking at those mags with the 50 degree apparent field zoom, but definitely worth it I wont go into what 1/4 wave and 1/10 wave actually mean, different interpretations about that.......... Both scopes fully cooled and collimated, chuffed with the 8” previously owned by a local club member sadly no longer with us. Ed.
  4. thanks, where do you find the pixel values for an image?
  5. Göran, I always create an RGB image as normal and then add the Ha to red and OIII to blue in lighten mode
  6. Nice and people say Maks are only good for planets and lunar.... Alan
  7. Strange, there shouldn't be much difference between f1.8 and f2. OTOH I found the Fujinon fish-eye lens 1.4mm and f1.8 let in a lot more light than the 1.55mm f2 lens which is considerably smaller. I suspect focal ratios on fish-eye lenses mean something different from "normal" lenses and telescopes.
  8. Superb images both of them, and this is a question to both Peter and Olly: How did you mix in the NB data to the RGB? Just Ha to red and Oiii to blue? Or did you only use the RGB data for the stars? Göran
  9. Just as an example, I took this one three years ago from the car park at Westonbirt Arboretum, so also not far from Bristol. It was taken a few days before opposition, but even so, Saturn only reached a maximum elevation of just over 10 degrees. I imaged it a couple of hours before it reached it's maximum height, so it would have been below 10 degrees elevation at the time. SW200p with the ASI120mc camera and captured a couple of thousand frames, stacking only around 20% of the best. The division can be seen so I was very happy with it considering the low elevation. John
  10. When you power up the mount are any of the buttons on the handset lit or flashing ?
  11. Can't advise on a CMOS camera settings or length of exposures. But basically you will want for broadband targets to use LRGB. Luminance will be the most important filter for detail as it is the most sensitive. RGB is simply used for colour. I always do much more and longer exposures for LRGB. If you are doing Narrowband, you will need Ha, Oiii and Sii (some people also use Nitrogen but I have never used one of these). In the case of narrowband it does tend to depend on the target as generall the most detail comes from the Ha so here again I do the longest and most exposures. In NB you can combine the filter in a variety of ways. 1. Hydrogen (as Red), Oxygen (as green), Sulphur (as Blue) HOS 2. Hubble palette Sulphur (as Red), Hydrogen (as green), Oxygen (as Blue) SHO 3. there are some targets with very little Sii so you can do bicolour HOO, and some targets with very little Oiii, so you can do HSS. Additionally some LRGB target will benefit from extra Ha, but maybe get to grips with the basics furst. You will need software which will register the various stacked filters so they will exactly fit each other (I think that was my biggest obstacle when i first started Mono imaging). I believe Pixinsight, APP, Registar and Maxim all do this. I have made a few videos on You tube on combining filters: Adding Luminance to RGB HTH Carole
  12. thanks just wondered if the hitec also gave lower readings when it was still lightish,to some extent like the sqm's
  13. Nice report, John. I haven't had another chance to spot the SN. It should still be in range of the C8 (it is reported as 13.6 on the Rochester site), but will require averted vision to get it. I also have the Delos 14mm (used it to nab this SN) and it is an awesome EP.
  14. I used 120 seconds for the core in Ha. I tried longer and shorter but found that about right. Olly
  15. I've no longer the data but failed to see these when I tried processing. I'll shoot more data and give it another try. How long were your exposures for the core? I was using Astrodon 5nm for Ha so it should be ok. It's a massively challenging target - but an invaluable learning experience. Peter
  16. I have just tried to use Colorgramme RMOB to record my meteor radar observations, however I have several problems with it. I've entered the data on the RMOB DATA tab, selected the month and year (April 2019) and clicked Save. However the data is not saved in the file. The file contains ??? instead of my data and shows the month as "may". How do I get it to save by data? The colorgramme tab shows no data either. I have been unable to find any help on using the application, it looks like it can take live data from Spectrum Lab, how do I set this up? Thank you James
  17. Today
  18. Yes, TEC140 and Baader 7nm Ha filter. For the core I used 14x120 seconds. Are you sure you didn't get them? If you were using the Astrodon 3nm I suppose it's just possible that they are shining in the NII line but it seems unlikely. Maybe they were drowned in longer Ha exposures? Olly
  19. This is where I keep going in Namibia. Does not get much better than that. This is where I went on my Honeymoon. This is where I am going on holiday this year. Why do I go to these places?? Because of this!!!! Welcome to central London....
  20. I found this in our loft when getting the Xmas decorations down - I'd been stung twice by queens in November, and dispatched another 16 in the house - couldn't figure where they were coming from until this point and didn't know it was there in the summer at all. Poor santa.. A 3 foot wasp nest makes for a good show and tell for the kids at school though!
  21. Regarding maps if you have a map on tracing or thin paper and look through it from behind you see east/west flipped. If you turn the map on its side and then look through from behind you see north south flipped.
  22. take the mount apart , I can drive a car it dont mean I'm a mechanic lol let's hope I dont need to do that for a while.
  23. I use a Mini-Giro mount with a Velbon Geo N543D tripod. Works nicely for both my APM 80mm F/6 and Coronado SolarMax-II 60mm. It even supports double-mounting them.
  24. If these are for public use not your own then I think cheaper is better. If it has to be UWA then Nirvanas or whatever appears on the second hand market at a reasonable price. If you change your mind and want something better for your own use, perhaps push the boat out a bit and look at the Baader Morpheus range.
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