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Experiment: Pleiades with Evostar 72ED & Barlow 2x

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#1 NucleusPhoto

NucleusPhoto

    Vostok 1

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Posted 06 March 2021 - 05:22 PM

Okay.. So last night I went out and did a bit of an experiment. I tried shooting the pleiades up close: With my 420mm Evostar 72ED and a 2x barlow lens, on the Star Adventurer, unguided. This is a stack of 350+ lights, 20s, ISO 3200 (yes in retrospect ISO3200 was pushing it I suppose. As I said, it was an experiment), calibrated with 60 Flats, 50 Darks and 40 Bias frames. Stacked in APP and stretched/edited with my limited abilities in Photoshop.

 

Here's what I could pull out of it. It's definately not great: It's pretty noisy, the stars in the bottom left corner are elongated.. but to be honest I'm fairly happy with what I got! I didn't think this would be possible, and I think this does indeed prove I got the wobble out of my rig and my PA on point (though maybe 20 seconds is to short to conclude that, even at 840mm) 

Attached Thumbnails

  • M45_Pleiades-20210305.jpg

Edited by NucleusPhoto, 06 March 2021 - 05:23 PM.

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#2 deansjc

deansjc

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Posted 06 March 2021 - 10:44 PM

Same scope as OP, but at 420mm using a stock Nikon D5300.  ISO 200, 40 minutes, Bortle Class 2, no calibration frames.  Approximately 40 minutes total exposure.  This was considerable cropped.  My intention was to include Mars on 03/05.  While it did fit in the frame, it just presented poorly.  This shot suffered from a poor PA and less than crisp focus.  It was -15C with a bitter wind, making it very challenging.

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  • Capture.JPG


#3 NucleusPhoto

NucleusPhoto

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Posted 07 March 2021 - 04:47 PM

Hey, good shot as well! I only cropped out the edges, but yea.. trying this with a barlow lens wasn't the best idea ever.. Still an interesting experiment & good practice. 




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