Orion wide field

Discussion in 'Astrophotography' started by georgian82, Jan 3, 2016.

  1. georgian82

    georgian82 Mu-43 Veteran

    Jan 17, 2014
    This was taken with a modified EPM2 and 25mm 1.8 lens at f/4 and ISO 800 with Hoya red enhancer. I was only able to get about 20 exposures of 3.5 min each before the clouds started to roll in. I was also combating light pollution coming from the lower right corner of the image which made post processing very challenging. Orion wide field.jpg

    This is a work in process as I am planning on continue adding more data in the next month.

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  2. pellicle

    pellicle Mu-43 Hall of Famer

    Feb 10, 2010
    Southport, OzTrailEYa

    what are the modifications?
    why did you choose f4 not 1.8?
  3. georgian82

    georgian82 Mu-43 Veteran

    Jan 17, 2014

    The modifications to the camera consisted of removing the stock filter and replacing it with a IR/uv cut filter that lets the hydrogen alpha wavelength pass through so that it can pick up the red color from some nebulae.

    I stopped the lens down to f/4 because this lens suffers from vignetting and coma at f/1.8. I find that at f/4 the corners look very good and I don't even have to crop the image due to these aberrations which is important to me since I am covering such a wide field.

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