Recently Browsing 0 members
No registered users viewing this page.
This is a two panel mosaic (with central overlap) that has been waiting to get processed - for some reason my first attempt to process it reached a dead end where I was rather disappointed with the results and gave up. But with clouds and moon conspiring I have made a new attempt from scratch. Taken with my Canon 300 mm f/4 (@f/4) on my triple rig on the same night as the previously posted Samyang 135 and ES 127ED images, so 21 Dec 2017. Like my Samyang mosaic, this is an accidental mosaic created by a shift in framing after the meridian flip, resulting in a somewhat unusual framing. Stacked in PI and processed in PS. 76x3min @ ISO1600.
Here is my previous post with the little Samyang and 5" refractor:
Comments & suggestions most welcome
This is an accidental mosaic since the framing of the Samyang moved after the meridian flip at midnight (it was sitting on my triple rig and I only adjusted the framing for the large refractor after the flip). I think it was a fortunate move since it allowed me to catch a lot of dark nebulosity above and to the left of NGC 1499 and a cute little nebula called NGC1579. Taken from my garden obsy on the Swedish countryside in Värmland on 21 Dec 2017. Temperature was ca -4°C and SQM 20.9.
Camera: Canon EOS 60D (unmodded) at ISO1600.
Lens: Samyang 135mm f/2 (@f/2)
Mount: SW EQ8
Guiding: SW ST80 + QHY5LIIM + PHD2
Exposures: 192 x 1min = 3.2 hours
(No flats, bias or darks but this is taken with an APS-C sensor on a lens intended for full frame DSLRs so no vignetting that Gradient Exterminator could not easily handle and the outside temperature of -4°C kept the noise very low)
Processed: PS CS5
On Thursday night I had my third session with the triple rig: a Samyang 135mm f/2, a Canon 300mm f/4 and an ES 5" apo (@ 750 mm FL f/5.9), each equipped with a Canon 60D set at ISO1600 (60Da on the 5" refractor). Temperature was around -4°C, so almost no noise in the DSLRs, but about half of the subs had to be thrown out due to clouds and after I went to bed after the meridian flip (00.30), I lost guiding at some point and for some reason my laptop had shut down when I woke up at 7. In any case, I got a fair amount of data with the Samyang (192 x 1 min = 3.2 hours at f/2). I only got 18 x 8 min of usable frames with the 5" refractor, but the subs were rather good. The canon 300 mm was possibly poorly focused. In any case it did not produce results that I like to post.
So here are results of the 135 mm wide field and 752 mm close up.
I used the refractor for framing after the flip but the 135 mm had for some reason moved a bit allowing me to make a mosaic (with the central part of the image with data from both before and after the flip). That accidental move brought in quite a bit of dark nebulosity and a little nebula called The Northern Trifid Nebula (NGC1579).
I am quite unsure about what shade of red to use on the California. I see everything from bright orange to magenta on the web. I have gone for something in between. Yes, I know, I should add some Ha to this object....
Comments and suggestions most welcome!
So I was looking at having a go at NGC1499 with an unmodded D5300. After having a quick look, is it even worth it? I've had a try anyway and I'm currently running an 8 minute stack under light polluted skies. Preparing myself for some disappointment here. Can I get away with just adding more data under better conditions? Because I was shooting at 70mm on a standard tripod my exposure times are somewhat restricted. If there's anything at all from this stack I'll post it up but I'm not holding my breath