2020年2月25日 · M51 with 300mm lens - posted in DSLR, Mirrorless & General-Purpose Digital Camera DSO Imaging: Star Adventurer, Canon 600D, Sigma 70-300mm lens maxed out to 300mm. Occasional hairdryer. Pinot Noir. Gaffer tape, 2 dogs and a very cold nose. No darks, flats etc. 70s exposures totaling 2.5 hours. Processed in PS and tweaked in LR.

2015年5月25日 · I really didn’t even intend to image an object… just wanted to test a newly acquired 300mm F/4L that I picked up on e-bay for cheap (broken autofocus). The lens looked very good to me and the clouds stayed away so decided to see how M51 would look. Details: Mount: Ioptron SmartEQ Pro Lens: Canon 300mm F/4L (non IS)

2016年3月10日 · Here is my effort to get M51 with a 300 mm telephoto lens on a slightly windy night in a bright green zone just a little west of Denver. 53 minutes total exposure time with a 300 f/2.8 lens + 1.4x TC, and Canon 7D2 camera, giving 2 arc-seconds per pixel.

2006年5月2日 · M51 with 300mm tele lens - posted in DSLR, Mirrorless & General-Purpose Digital Camera DSO Imaging: This is a 100% full frame’s crop I took with a 300mm tele lens piggybacked on Vixen GP Mount from suburban sky near Milan (Italy). Its a stack of 15x30sec at IOS 400 on Eos 20d camera.

2017年3月26日 · M51 as seen from the mountains of central PA on 3/22/17. Acquisition details: Nikon D3200 - 300mm - f/5.6 - ISO 800. 18x 2 minute lights, 5x 2 minute darks, 5x bias frames. Tracked using the AstroTrac TT320XAG. Stacked using DeepSkyStacker and processed in Lightroom. Image is slightly cropped. Conditions were cold, clear, and dry.

Test pic for Star Adventurer DEC guiding with Photorobot. Dithering and guiding worked 100% without dropouts, but mechanics found not being user friendly and reliable enough. Canon's 300mm L was stopped down to f/5 here. 3min subs at Iso800.

My first attempt at M51. Canon 400D and 300mm lens. F10 30x1min 800 ISO exposures. On Astrotrac mount. Stacked in DSS and PSP tweaked. Not bad for partly urban light pollution, moon up and OK seeing.

2017年4月30日 · Acquisition: Nikon D3200, 300mm, f/5.6, ISO 800, 18 2-minute lights, 5 darks, 5 bias, 50 flats. Tracked using the AstroTrac TT320X-AG Stacked using Deep Sky Stacker and processed with GIMP and Lightroom.

2013年4月3日 · I still regard myself as a relative beginner to astrophotography. Maybe more intermediate now, but I managed to grab this shot of M51 last night from heavily LP'd Blackpool. I'm very pleased with the detail I got, but the image has a lot of mysterious marks which run top to bottom on an angle.

2016年4月12日 · Whirlpool Galaxy M51 with AFS 300mm f/4 E PF at f/4.5, 82 x 60 sec, ISO 1600, 2 x drizzle in DSS. Now to the question: I have noticed that many members of this forum accumulate exposures over multiple image sessions.