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Diatoms *new images*
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zzffnn



Joined: 22 May 2014
Posts: 1681
Location: Texas USA

PostPosted: Fri Feb 02, 2018 5:51 pm    Post subject: Reply with quote

sushidelic wrote:
....Illumination was mostly COL (circular oblique) and playing with the polarizers......


Very beautiful images, Michael!

Did you enhance the contrast a lot in post and darken the background?

My budget polarizers cannot not provide pure black background when fully crossed. My budget LOMO objectives can resolve very well in COL+pol, but my eyepiece view has never been so contrasty with such black background.

Thank you for sharing!

If you did not say those were taken with COL+pol, I would have guessed you used overhead highly oblique external light with very long exposure.


Last edited by zzffnn on Fri Feb 02, 2018 7:41 pm; edited 1 time in total
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Smokedaddy



Joined: 07 Oct 2006
Posts: 1130
Location: Phoenix, Arizona

PostPosted: Fri Feb 02, 2018 7:32 pm    Post subject: Reply with quote

... amazing.
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sushidelic



Joined: 10 Jun 2016
Posts: 205

PostPosted: Mon Feb 12, 2018 7:27 am    Post subject: Reply with quote

Oops, I somehow completely missed the additional answers, sorry - so thanks a lot!

@zzffnn: Contrast adjustments and background cleanup / darkening are quite substantial on those shots. With an oiled DF condenser & planapos, there are so many depolarizing optical elements in the way that the background just darkens a bit when crossing them. It really helps adding detail to the small structures though. So yes, it does indeed look quite different through the eyepieces, but I try to figure what it can look like after editing, not what it actually looks like Smile.

Best regards,
Michael
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Cactusdave



Joined: 09 Jun 2009
Posts: 1628
Location: Bromley, Kent, UK

PostPosted: Wed Feb 14, 2018 4:22 am    Post subject: Reply with quote

Beautiful images, both technically and aesthetically.
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