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johnrt

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Everything posted by johnrt

  1. Being on furlough from work has meant I've been able to put some effort in to some Raspberry Pi projects, but not astronomy related unfortunately as I had to retire due to some very large trees. Here's my Pi 4b 4gb with a fan hat & rf transmitter hat on top. I've been working on a project with 2 radio controlled sockets to control my darkroom enlarger and safelight from the Pi. I used Node Red which is a very simple and intuitive programming environment that works well for this type of thing. Here's my control dashboard that I can access from my phone when I am printing. The recent addition was adding the f/stop readouts that calculate 1/4 stops of light on the fly based on the base exposure time set by the user. The time can be set in 10ths of a second and the run switch activates the timer, switches the socket on, counts down then switches off again. Great fun John
  2. Always looks like a giant fluffy pillow when this is done right, very nice.
  3. Very impressive, I've not visited the DSO imaging forum for a few years and you have certainly upped your game while I have been away. Beautiful image.
  4. Ahaha! More galaxies than you can throw a stick at! My kind of image
  5. Big Sur running on my new M1 Mac mini, really fast and the mini is barely breaking out the fans for anything I throw at it. Not running any astro apps though
  6. Hello, Nope, never had a problem with this sort of thing. I used to bin all my RGB 2x2 and shoot a master flat using the Lum filter only at full resolution and then use Pixinsight to register it to the binned images. Sorry I can't be of more help. Would have to be a fairly bright red light shining directly on to the scope from somewhere to be a light leak.
  7. I used the 1.25" Cheshire back in the day when I was using my 6" RC.
  8. G'day Kirret, Stick to narrowand imaging with the modified DSLR, you can get a clip in Ha filter and extract the red channel of the image to get a pretty decent mono Hydrogen alpha image. How is the mount doing? Have you got it up & running now?
  9. It’s been such a long time since I had a go but I may well take you up on this tomorrow. Great image by the way.
  10. Erm no, I don't agree. If you are making a purely RGB image then you are creating the colour, not adding it. Every colour image in photoshop is made from 3 channels applied to the red / green and blue. You are creating these channels yourself with the use of filters & simply applying them to where they belong in the software to create your colour image. You are only adding colour to an image of you start to use Luminance. Yes Pixinsight can also do this, use the channel combine tool.
  11. Oh, I imaged this galaxy pair last year or the year before, can't quite remember, but had no idea there was a planetary lurking right next door, very interesting!
  12. You use a software program such as photoshop and place the aligned mono channel from each filter to the corresponding channel, and you have a colour image.
  13. Smashing! 5 minute subs seem a little long, I thought the whole point of these new CMOS chips was that your could take lots of very short exposures, rather than the more traditional method of 10/15 longer subs?
  14. Are you going with an Altair pier? They really are great quality and very easy to install. I can't recommend them enough.
  15. The clouds have parted for a little while, so it's now all aligned and ready to roll
  16. A busy afternoon of drilling, resin injecting and tightening of bolts and my pier is ready to go! Great service from Altair Astro and they have delivered a really quality product here, not the cheapest, but for those of us who don't want to build one from scratch this is superb. ... and with the cover on... Thank you for all the advice above, made it a painless job. John
  17. I did notice that, I have a regular mastic gun at home, but we might have one of those at work, I'll see the man that knows in the morning. Thanks for all your help Dave.
  18. Thanks Dave, I might just take you up on the offer , although it's possible we might have one at work I can pinch for an afternoon I'm told.
  19. Does anyone have any comments as I'm not sure what I'm buying here
  20. Something like this from Screwfix? http://www.screwfix.com/p/rawlplug-r-kf2-380-tarmac-masonry-resin-380ml/62007
  21. Afternoon! So the concrete base is poured and ready, I ordered the chembolt sleeves as recommended above and the anchor resin to fix them. Unfortunately the resin is out of stock and the manufacturer cannot supply more, and apparently has no idea when they will be able to manufacture any! The retailer could also not recommend an alternative product! All a little strange. So does anyone have any suggestions of an alternative source for anchor resin?
  22. It's quite sandy down at the bottom of the hole, I had to dig through and old path nearer the top which was hard work. We have a couple of sand quarries very close to us in Borough Green.
  23. I have begun digging the hole for the concrete pad, I will follow the advice above and drill / glue so I can remove the bolts at a later date as suggested. The hole is measuring 38 x 38 x 50 cm at the moment, or in old money 15 x 15 x 20 inches. So would you bother going any deeper than that? And how many bags of the hard stuff will it take to fill, I'm reckoning on about 8 bags of premix concrete (25kg bags).
  24. Some good advice there, thank you all. Does anyone know what size the bolts are that are supplied with the Altair pier to fix it down to the concrete base?
  25. In an attempt to defeat the trees currently overgrowing my view of polaris I am considering installing a pier to the back garden, the Altair pier looks like a good solid quality product. The idea being that I can align the mount each winter while there are no leaves on the trees and leave in place all year round, my mount already lives on it's tripod permanently outside so no difference there. The pier itself will need to go in a pretty intrusive place in the garden, so one that can be removed easily in case we decide move house or something is essential. For those of you who have installed one of these, what are your thoughts on this product? What size base did you did and pour to bolt the pier down on to? Any other suggestions are of course very welcome. John.
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