alacant
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Everything posted by alacant
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+1. I think it's the accompanying explanations -written instructions- which put the fuss into it. If someone had given just a one liner, get a Cheshire and make it look like this, I for one would have got there quicker. HTH.
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Brilliant. There are some really awful foreground stars which ruin lesser photographer's efforts. You've got them under control. I reckon a 1-pixel shrink with 2 pixel fuzz Magic under a fat-star -save the mask before you denoise- ST mask would really nail it:)
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StarTools Magic. It's magic:)
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Hi. I think one only obtains a regular ellipse -the shape of the secondary- by taking a section through a cylinder. A conic section -the light from the primary- has the minor axis displaced toward the 'fat' end of the cone. I can only explain it by doing it:
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Hi. At f5, the secondary should not be centred. Centre, yes. Then displace. It looks something like this. HTH.
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Hi. Do your flats clear the problem? Unless the issue is affecting your photos and the flats are doing their job, I'd forget it. I think the procedure is to centre the secondary then displace it 3mm both toward the primary and away from the focuser. But life is short... HTH.
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Hi. Even on modified cameras where the camera ir filter retained, it's never strong enough and the ir records as unfocused visible, especially with refractors, no matter how APO they maybe. One of these will tighten the stars back to normal. No need to go brand name. They all come from the same factory in China. AliExpress or eBay sources are fine. Around €15. Add a wratten#8 -marketed as fringe killer at 10 times the price- and you really are in business. HTH.
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Hi. Here's my first snap with a camera attached to a telescope. 1999. FujiColor film. You peered through the illuminated eyepiece and guided by keeping a star on the cross-hairs using the hand controller. I resurrected the telescopes last year. How things have changed. Nostalgia.
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The clusters look amazing in your composition. Hope you don't mind, I'm learning colour balance ATM. I took the curves down a bit. Probably way off now! Clear skies.
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Ah. OK. Is this with the sw cc? I was getting D shaped stars to one side of the frame when the camera was aligned with the focuser knobs. On my reflector, it takes the focus tube 1cm further into the main tube and so interferes with the light path. Moving the mirror caused vignetting so I cut the end off the focuser. Am I correct in believing that the gso cc allows focus at the normal position and so negates the ingress? TIA.
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That's a really nice image crying out for the rather nice ST Life module. Worth a try?
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Hi. I've a sneaky feeling that some outlets buy them in bulk, write Baader or Optolong on them and knock 'em out for 10 times more;)
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...but far less jump-on-the-bandwagon-oh-so-predictably boring!
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Unfortunately it always nudges in the same direction. Hence the importance of randomly. AKA dither. HTH.
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Light, flat and bias frames and randomly nudge the mount a little after each exposure maybe too? HTH
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Flat and bias frames? HTH
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Hi. I've an affordable refractor too and have managed to tame the CA [1]. The cure is a uv-ir cut filter -to help the inadequate in camera filter and prevent those wavelenhgths recording as visible- with deconvolution of the blue channel so as to push the blue back to the central star. The method is unfolding here... HTH. [1] Which IMHO is infinitely better than having hideous spikes protruding from every star!
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SHOW US YOUR NEWTS........
alacant replied to laser_jock99's topic in Discussions - Scopes / Whole setups
Hi everyone. Short tube, big secondary and proper 2 1/2" r&p focuser; the new Bresser 150/750. Makes pds' look decidedly dated! Just add CC for instant AP.
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Absolutely. The LRGB module will pull only the channel(s) you choose, be it separate files or a colour stack. HTH.
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Hi. StarTools right? It looks like the blue has fattened the stars: Load the blue only in LRGB, Autodev. Decon, radius 3.0*, 1 iteration, show result. Restore to Linear Wiped Deconvolved. Save that as blue.tif. Now fire up LRGB again, load the Red and Green from the original but use your blue.tif for the blue. It concentrates whichever channel is 'fat' back to the central star. After killing tracking, Magic a pixel or two. HTH. *That's my starting point. YMMV
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+1. Again and again: have a go with what you have. There's not enough experimentation. Things really have moved on from the EDsomething on an eq6 days. And IMHO for the better.
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Hi everyone. I was fed up of galaxies being a small spec in the frame so I set up this old 6" refractor to have a go at Stephan's Quintet. Still quite small but at least identificable as galaxies this time. Despite many dismissing it out of hand, I think it worked quite well on my dslr. Having said that, when it was first made -in the mid 90s I think- I doubt whether this would have been possible without a house remortgage! Cheers and clear skies.
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Hi. No expert but I believe it is because of the canon sensor recording invisible radiation as blue at one end of the spectrum and red at the other; it shouldn't. It's the same effect that makes the stars fat. A #8 reduces the blue and a #12 eliminates it, but I don't think that's what you're aiming for (?). HTH.
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The semi-apo doesn't really do CA; I think it removes around 50%. A uv-ir plus a skyglow I find works better but still a great shot. HTH.
