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Photosbykev

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Everything posted by Photosbykev

  1. I've recently built a new computer for image processing and rendering work and it's based on the 9900k running at 4.9Ghz with 64Gb of ram and fast m.2 drives. I understand that PI doesn't use the GPU and the author doesn't intend to support them anytime soon so it all about the cpu and memory
  2. The postman was kind to me today and dropped off a William Optics Zenithstar 61 and Flat61A flattener and the gods smiled on me with clear skies for 30 minutes. It would be a shame not to christen the new toys I only managed 10 lights so I didn't even consider darks or flats. The 10 lights from the Canon 5D MkIV, shot at iso 1600 x 60 seconds, were stacked and aligned in PS, median filtered for some noise reduction and then a few layer/curves tweaks to pull out some basic detail so I could look at the star profiles and and any vignetting. Overall impression is extremely good build quality and the focusing through the mask is ok on very bright stars but quite a challenge on lesser star magnitudes. Very little vignetting through the imaging train so the image circle cover the full frame sensor and it will be simple to either remove the gradients in PS or use flats and sharp stars corner to corner with no obvious colour aberrations. I do need to check where the weird smudges are in the imaging train because they weren't on the camera sensor yesterday, hopefully I'll find them pretty quickly because they are nasty! Screenshots are also included of APT focusing, Stellarium for the imaging area after plate solving in APT and then PHD2 for the guiding with the ZWO ASI120mm-mini camera on a ZWO 30mm f/4 scope (I've no idea if the guiding is good or bad but the polar alignment was achieved with the iPolar camera in the SkyGuider Pro mount I think at some point I'll add an 2" IDAS D2 filter into the imaging train and see if I can counter some local light pollution we have around here.
  3. Nice setup I decided to finish the rig off properly and bought a WO Zenithstar 61 and flattener to stick on the front of the Canon 5D4 For info, I had to add one 3/8" diameter washer under the screwhead on the bottom of the counterweight shaft. This allowed me to move the counterweight one more millimeter down the shaft. The balance is fractionally camera heavy which I prefer to keep the gearing engaged
  4. To close this out, I've ordered the WO Zenithstar 61 Apo with the Flat61A adjustable flattener.
  5. I fitted an Arca Swiss clamp plate to the SGP and a generic Arca Swiss L bracket to the camera to hold the guidescope. I went this way so shooting wide angle the bracket on the Camera base would fit the Arca Swiss clamp. The larger lenses mount directly to the clamp and the guidescope remains fixed to the camera body Kev
  6. Very few camera lenses are coma free wide open, especially at the longer focal lengths and I'll take spikes over coma every day of the week. This was at f/8 on a Canon 70-200mm f/2.8L lens. Next purchase an astrograph lol
  7. Yup I don't dislike them on the main stars but next purchase will be an astrograph for some 'proper' astro work best regards Kev
  8. A nice night to tweak some system settings for astrophotography This is 27 x 1 minute exposures with a Canon 5D4 and Canon 200mm lens on a SkyGuider Pro mount autoguided with a zwo ASI120MM mini camera and scope in PHD2. Images were aligned and median stacked in PS CC with some levels and curves adjustment. Minor crop to clean out some vignetting in the corners. Center (RA, Dec): (304.835, 39.156) Center (RA, hms): 20h 19m 20.394s Center (Dec, dms): +39° 09' 20.166" Size: 9.48 x 6.32 deg Radius: 5.697 deg Pixel scale: 16.7 arcsec/pixel Orientation: Up is 270 degrees E of N
  9. Strange spec of image circle of 36x36mm but does cover full frame I guess. This would be at the very top end of any budget I'd consider for occasional use but one to consider
  10. That's an interesting option and similar price of the WO 73+flattener
  11. I've got the 400mm f/5.6L lens and it's good and almost flat at f/8 but some vignetting at f/5.6 which flats can control, and I used to have the Canon 600mm f/4L which was superb, but I'd like to get away from variable apertures and the associated spikes. I could, and have in the past, fitted a fixed circular aperture disk on the Canon lens which does work. I'd expect a good dedicated telescope to produce better images. Kev
  12. I agree the flattener will be necessary I'd hate to get annoyed by poor edge performance Kev
  13. Hi folks, I normally photograph with a Canon 5D4 and Canon glassware but fancy a lightweight widefield refractor around 400mm fl that will produce a nice flat image circle large enough for a full frame sensor. One scope I keep looking at is the William Optics Zenithstar 73 II Apo refractor and I'd like some advice on what else I would require for full frame imaging or maybe alternatives to the WO 73? The WO 61 Apo is also on the radar but I suspect I would regret not going slightly larger I'll only be using it infrequently but it will be mounted on a SkyGuider Pro with ZWO guidescope system regards Kev
  14. Tempted Dave but I'm guessing it's fully booked and it's also on fireworks weekend so we'll probably end up in the middle of Wales with the dog on a very remote campsite to avoid getting her stressed. Kev
  15. 3 or 4 years ago I pretty much walked away from any serious astrophotography and SGL and spent more time shooting high resolution 360 panoramas, chasing the northern lights and landscapes than anything else. Now I've retired after 43 years of work, bought a motorhome and started pottering around lol I've also just taken delivery of a SkyGuider Pro from FLO and ZWO ASI120mm camera and 30mm f/4 guidescope to dip my toes back into the nights of astrophotography with all the frustrations and hassle it can throw at us First attempt, purely as a test to see if the iPolar polar alignment and the mount were tracking correctly, was with a 600mm lens and x1.4TC and autoguiding with PHD2. Completely over the weight specification for the mount and a lead filled bag was needed to get a good balance but worth a play as the skies are pants at the moment with just an occasional hole in the clouds. A single 5 minutes @ iso800 uncropped image processed through Pixinsight, the only image I got before the clouds rolled in again I strongly suspect I will get a lot of rejects at this focal length but at 3-400mm and wider it should be quite nice. It's good to see a lot of familiar names still on SGL, see you in the Forums
  16. Meteors will generally have some colour in them (red/green) and satellites never have colour in them as they are just reflecting sunlight. The horizontal one is definitely a meteor and I'd say the vertical one is as well because of the green tint but it does look like a satellite unless your white balance is off Kev
  17. The track and period for the flashes are very close for Atlas rocket body.....FIA Radar 3 Rocket Debris Cat No 39475 Thank you
  18. I've made an error in the time it was at 03:07 UTC, I've updated the post to correct the error. I'm told it is 2014-72P, #39475, a Centaur rocket
  19. Anyone care to find out what satellite made this interesting trail that faded in and out in a regular period as it sailed across the sky over Llyn Padarn, North Wales because I can't track it down on Starry Night Pro 7 or Stellarium GPS location is 53.138735, -4.155010 looking SE and the track was left to right (N to S) starting at 03:07UTC on the 10th April 2016. Track duration to cover the FoV was 9 x 15 second exposures with 2 second gaps between exposures and strangely for a satellite there is a hint of colour in different areas of the track .
  20. I keep going back to the data and tweaking it a bit more each time so the interactive panorama is changing daily lol You can know turn the 'flare' on and off by using the control icons on the left end of the controls
  21. Snowdon and the Milky way panorama. 41 images captured on a Sony A7S and Samyang 24mm f/1.4 lens exposed at 8 seconds, f/2.0 iso5000 and post processed in Autopano Giga to produce the stitched image and then processed in Autopano Panotour to produce a 360 interactive panorama which is quite nice to play with full screen
  22. I'm planning to drop in around 8am on Saturday for breakfast
  23. Llyn Padarn "Stars into Sunburst" timelapse. A stunning clear night on the lake covering from 01:00 until 10:00, I've shortened some of the sequences as there were just too many images captured in 9 hours
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