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lukebl

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lukebl last won the day on August 3 2019

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About lukebl

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  • Gender
    Male
  • Interests
    Norfolk Astronomer, bread-maker, bug and wine enthusiast. Come to Attleborough. At least it's not Watton.
  • Location
    Central Norfolk-ish somewhere, UK, 52°N 1°E ish
  1. Terrible seeing this evening, but I managed some detail on Venus with Baader UV and IR filters. c. 7000 frames for each channel. Green channel made from 50% UV and 50% IR . 3x Televue Barlow, Omegon RC8 (effective focal length 4800) and a ZWO ASI 290MM Mini Mono camera. Maybe, just maybe, will have a still evening. I think under steady skies, the clouds through the UV filter could look superb.
  2. This is my first attempt at a false-colour image of Venus. Captured with UV and IR filters, c. 5000 frames for each channel. Green channel made from 50% UV and 50% IR . 3x Televue Barlow, Omegon RC8 (effective focal length 4800) and a ZWO ASI 290MM Mini Mono camera. Focusing is the trickiest thing. If only I could be sure when focus was spot-on. I also wonder if imaging Venus might be easier when it's a morning star, as I assume the seeing is better at dawn rather than dusk? Slightly different flavour:
  3. Interesting. I have one advertised for sale, but it’s certainly not sold yet!
  4. Thanks, David, but the roofing felt itself doesn't leak. It's the joins, due to the fiddly roof design. So pond liner would have the same problem. It seems to be dry-ish inside now, though. Most of the rain now comes in through the door, when it's windy!
  5. Surplus to requirements due to upgrade. Altair GPCAM2 AR0130 Mono Camera (New model) - Full set. Boxed and in excellent condition. Includes: Camera body (3.75 µm x 3.75 µm, 1280x960 pixels) 2 m High-speed USB2.0 A male to B male cable 1.5 m ST4 guide cable 1.25 inch nosepiece with 1.25" filter thread C-mount 5 mm extension adapter for C-mount lenses requiring 17.5 mm backfocus CS-mount adapter with clear glass filter AR coated CS-mount adapter with built-in UV-IR blocking filter, AR coated (for imaging with lenses or refractors) 150° rich field objective. £110 including postage (UK Only). Payment by bank transfer. Copernicus with this camera: Venus:
  6. Further to my recent efforts to image Venus with a UV filter, I decided to splash out and get a ZWO ASI 290MM Mini. With its super-sensitive sensor and high frame-rate I thought it was better suited to the UV filter, and so it has proved to be. I think I was lucky to get hold of this camera. With China shutting down at the moment with THE BUG, supplies of ZWO cameras and similar items seem to have run out here in the UK. As I lamented previously, my other cameras could only manage exposures of around 1/4 second (250ms) with this filter. Not sufficient to capture the seeing. However, this time I managed exposures of 15ms. I'm now awaiting the delivery of an IR filter, so that I can prepare some false-colour images of the clouds. Looking forward to some calmer, clear weather. Baader U-filter, 3x Televue Barlow, Omegon RC8 (effective focal length 4800) and a ZWO ASI 290MM Mini Mono camera. 7000 frames stacked in Registax.
  7. I just had a go with neither CS mount in place, and I still require lengthy exposures. I guess, then, that it must be down to the UV sensitivity of the sensor.
  8. That's very interesting. I wonder if I've just been blocking all of the UV light by having the UV blocking filter in place. There are two seemingly identical CS-mounts in the box, which have no identification marks on either, apart from the letters 'CS'. However, one of them has a pink bloom at certain light angles as you can see below, so I assume that's the UV-IR blocking one. I have been using the other one, which I therefore assume is the clear one and thus not the cause of the problem?
  9. Impressive sketches! I didn't realise that it was possible to see such detail.
  10. Following on from my Venus image on the 5th February, Here is another one from 8th Feb. Note the interesting bright patch on the limb near the equator. Baader U-filter, 3x Televue Barlow, Omegon RC8 (effective focal length 4800) and an Altair GPCAMv2 130 Mono camera. 3000 frames stacked in Registax. Unfortunately, as I explained in the other post, the images are very soft due to the long exposures required with my camera and this filter (1/4 second). However, it's pleasing that real features are still discernible. The clouds rotate around the planet every 4 days, even though the planet itself rotates once every 243 days.
  11. Thanks Pete. It's a complete mystery to me how you can capture it at 14ms and I can only manage 250. I'd welcome any suggestions! I didn't think my camera was that unsuitable for the job. I note that you use Firecapture. Perhaps you can crank up the gain better in Fircapture than Sharpcap? Perhaps the filters are different?
  12. Pete, what exposure times are you managing with Venus and the Baader filter? As I've mentioned in my post here, this filter lets through so little light that I can't capture anything with an exposure faster than 1/4 second. So I can't manage to freeze the seeing. I managed a reasonable effort with that image last night, but this evening I couldn't capture it anywhere near as sharp. I noticed someone on Cloudy Nights had managed to capture it at 1/100 sec. I wonder what I'm doing wrong?
  13. Thanks for the comments. Yes, gain was cranked up to maximum, using Sharpcap. The sky was a bit hazy, so I could probably get faster exposures with a clearer sky.
  14. I managed to capture some interesting detail on Venus this afternoon. This was captured with a Baader U-filter, 3x Televue Barlow, Omegon RC8 (effective focal length 4800) and an Altair GPCAMv2 130 Mono camera. 2500 frames The trouble with this filter is that it allows so little light through that the exposures were 250ms, so it's impossible to properly catch the seeing. Does anyone else manage faster exposures with this filter? Quite pleased with the result, though.
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