Post by howie1 on Mar 22, 2018 6:42:19 GMT
Target: Horsehead. Framed so Alnitak which is off to the left does not "blow out" the Horsehead nebulosity.
Aim of shot: Testing ISO3200 (based on clarkvision) rather my normal iso800. Also went 60 seconds rather than my normal 30 seconds as I had earlier in the evening attempted to make a video showing a PA method using User Objects rather than Sharpcap PA and wanted to see star trailing using the User Object method via longer exposures (video of setting up using that method failed cos low light video turned out unviewable!)
Site & conditions: Light green zone. No Moon. Target 10 degrees West of Meridian.
Gear: Unguided Skywatcher 200p f/5 newtonian on HEQ5 Pro. Modded EOS650d with digital grey card set custom whitebalance. 2008-9 Macbook bootcamped running Win7, Astrotoaster and Win Photo Gallery.
Exposure etc: S1 (Small fine quality) format jpeg at ISO3200 for single 60 second frame. Stretched in Astrotoaster out in the field doing EAA with Expand Grad 12, Lens Grad 39, Saturation 12, Brightness -28, Contrast 24, Blackpoint 1520, Whitepoint 7000. Time from shutter release to seeing image totals about 1min 30sec. Then saved the Astrotoaster image into the laptops Windows Photo Gallery folder where it's double clicked to open in Photo Gallery Editor. Increase brightness, increase shadow detail then denoise and voila ... here 'tis.
Comments: If you zoom in you can still see noise but unzoomed and out in the field at night it looked fine. BTW noise and other artifacts are present due to (a) didn't do a Sharpcap PA, but tried to shoot a video of my old Saved User Objects method to post up how to do it - but it was too dark to shoot video! Next time I hope to get to do that. So there is some star trailing (b) I shot my usual jpeg S1 setting rather than RAW which I have been mucking around with since getting the Rokinon 135mm f/2 lens at Christmas - and I've seen RAW results in much sharper images due the jpeg algorithm doing damage on the conversion within the camera. Jpegs fine for EAA but not when trying to get into true AP (hmmm, turned to the dark side I have!). So yeah its jpeg and hence weird blocky artifacts and grain are there; (c) ISO3200 has four times the noise of my normal ISO800 but I was trying out iso3200 due to reading clarkvision website saying only 1600 and 3200 overcomes the sensor electronic noise floor. Hmm? ... maybe its less noticeable shooting RAW but when jpeg then IMHO 3200 has waaaay more noise than 800 and 800 still does yield good crisp EAA 30 sec exposures. Anyhow dummy me didn't take an equivalent iso800 to show the diff ... another time maybe.
And its a tif file as thats what Astrotoaster saves files as. You may shoot in RAW or jpeg but when you save the toaster image it saves as tif. Also, if the EXIF properties stay with the tif file and you download the image from the forum, you'll see that for some weird reason the date modified is correct as that was the time the image was taken on Saturday night then tweaked in AT and PG ... but on transfer to my network drive just earlier this arvo Windows has replaced the date created with this arvo's date? No idea why its overwritten that?
The final image after about 2':30" to 3' 'ish in-field : IC434 single 60 sec iso3200 S1 unguided jpeg as stretched by Astrotoaster, saved then tweaked by PG. Cheers
Aim of shot: Testing ISO3200 (based on clarkvision) rather my normal iso800. Also went 60 seconds rather than my normal 30 seconds as I had earlier in the evening attempted to make a video showing a PA method using User Objects rather than Sharpcap PA and wanted to see star trailing using the User Object method via longer exposures (video of setting up using that method failed cos low light video turned out unviewable!)
Site & conditions: Light green zone. No Moon. Target 10 degrees West of Meridian.
Gear: Unguided Skywatcher 200p f/5 newtonian on HEQ5 Pro. Modded EOS650d with digital grey card set custom whitebalance. 2008-9 Macbook bootcamped running Win7, Astrotoaster and Win Photo Gallery.
Exposure etc: S1 (Small fine quality) format jpeg at ISO3200 for single 60 second frame. Stretched in Astrotoaster out in the field doing EAA with Expand Grad 12, Lens Grad 39, Saturation 12, Brightness -28, Contrast 24, Blackpoint 1520, Whitepoint 7000. Time from shutter release to seeing image totals about 1min 30sec. Then saved the Astrotoaster image into the laptops Windows Photo Gallery folder where it's double clicked to open in Photo Gallery Editor. Increase brightness, increase shadow detail then denoise and voila ... here 'tis.
Comments: If you zoom in you can still see noise but unzoomed and out in the field at night it looked fine. BTW noise and other artifacts are present due to (a) didn't do a Sharpcap PA, but tried to shoot a video of my old Saved User Objects method to post up how to do it - but it was too dark to shoot video! Next time I hope to get to do that. So there is some star trailing (b) I shot my usual jpeg S1 setting rather than RAW which I have been mucking around with since getting the Rokinon 135mm f/2 lens at Christmas - and I've seen RAW results in much sharper images due the jpeg algorithm doing damage on the conversion within the camera. Jpegs fine for EAA but not when trying to get into true AP (hmmm, turned to the dark side I have!). So yeah its jpeg and hence weird blocky artifacts and grain are there; (c) ISO3200 has four times the noise of my normal ISO800 but I was trying out iso3200 due to reading clarkvision website saying only 1600 and 3200 overcomes the sensor electronic noise floor. Hmm? ... maybe its less noticeable shooting RAW but when jpeg then IMHO 3200 has waaaay more noise than 800 and 800 still does yield good crisp EAA 30 sec exposures. Anyhow dummy me didn't take an equivalent iso800 to show the diff ... another time maybe.
And its a tif file as thats what Astrotoaster saves files as. You may shoot in RAW or jpeg but when you save the toaster image it saves as tif. Also, if the EXIF properties stay with the tif file and you download the image from the forum, you'll see that for some weird reason the date modified is correct as that was the time the image was taken on Saturday night then tweaked in AT and PG ... but on transfer to my network drive just earlier this arvo Windows has replaced the date created with this arvo's date? No idea why its overwritten that?
The final image after about 2':30" to 3' 'ish in-field : IC434 single 60 sec iso3200 S1 unguided jpeg as stretched by Astrotoaster, saved then tweaked by PG. Cheers