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Antenna of an ant

 
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JH



Joined: 09 Mar 2013
Posts: 1268
Location: Vallentuna, Stockholm, Sweden

PostPosted: Tue Jan 19, 2016 3:36 pm    Post subject: Antenna of an ant Reply with quote

Hi

This is the antenna of an ant (formica sp).The first photo is from my test with a Baader fringe killer filter. The only noticeable effect of the filter is in this case a shift in the WB - wich I have corrected.

Regards Jörgen

Mitutoyo 20x, LED, Baader fringe killer filter


Mitutoyo 20x, Semi X-pol EPI, cropped
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carlos.uruguay



Joined: 23 Feb 2012
Posts: 5284
Location: Uruguay - Montevideo - America del Sur

PostPosted: Tue Jan 19, 2016 5:34 pm    Post subject: Reply with quote

Excellent
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Sumguy01



Joined: 28 Jan 2013
Posts: 1420
Location: Ketchikan Alaska USA

PostPosted: Tue Jan 19, 2016 8:36 pm    Post subject: Reply with quote

Nice.
Thanks for sharing
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Lou Jost



Joined: 04 Sep 2015
Posts: 4071
Location: Ecuador

PostPosted: Tue Jan 19, 2016 9:12 pm    Post subject: Reply with quote

As I understand it these filters are just cutting out the highest and lowest wavelengths to minimize chromatic aberrations in non-apo lenses. Since your lens is an apo, it makes sense that you would not see any effect except a color shift. But it would be interesting to try it on a cheaper non-apo lens!
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Lou Jost
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Jacek



Joined: 02 Oct 2011
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Location: Poland

PostPosted: Wed Jan 20, 2016 5:09 am    Post subject: Reply with quote

Very nice
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JH



Joined: 09 Mar 2013
Posts: 1268
Location: Vallentuna, Stockholm, Sweden

PostPosted: Thu Jan 21, 2016 10:11 am    Post subject: Reply with quote

Thanks for the comments!

I had some hope that the filter would take care of the little CA that is pressent when I use my Mitutoyo 20x.

I can see that the subject and the light affects the amount of CA but I do not know if there is variations in CA with different samples of the lens or if the distance between the lens and the tube lens matters.

Regards Jörgen
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JH



Joined: 09 Mar 2013
Posts: 1268
Location: Vallentuna, Stockholm, Sweden

PostPosted: Sat Jan 23, 2016 4:04 pm    Post subject: Reply with quote

Lou Jost wrote:
But it would be interesting to try it on a cheaper non-apo lens!


Here is a comparison at 100%, Nikon M plan 40x 0.5. PMax.



To my eyes there is a very small difference in this case. In other tests that I have done I could not find any difference at all.

Here is the final picture Nikon M plan 40x 0.5. PMax, Baader fringe killer filter.



Regards Jörgen
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Lou Jost



Joined: 04 Sep 2015
Posts: 4071
Location: Ecuador

PostPosted: Sat Jan 23, 2016 5:38 pm    Post subject: Reply with quote

Thanks...looks like there is a very slight purplish cast to the dark background details in the non-filter sample, which is not present in the filtered sample. Interesting to know about this option anyway.
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Lou Jost
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JH



Joined: 09 Mar 2013
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Location: Vallentuna, Stockholm, Sweden

PostPosted: Sun Jan 24, 2016 1:41 am    Post subject: Reply with quote

Thanks Lou Jost

When I checked this thread for updates using an Android tablet I realize that I need a better screen to be able to see the purple.

Regards Jörgen
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zzffnn



Joined: 22 May 2014
Posts: 1823
Location: Boston, Massachusetts, USA

PostPosted: Sun Jan 24, 2016 8:27 am    Post subject: Reply with quote

Beautiful photos. Thank you!
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Lou Jost



Joined: 04 Sep 2015
Posts: 4071
Location: Ecuador

PostPosted: Sun Jan 24, 2016 8:40 am    Post subject: Reply with quote

"I realize that I need a better screen to be able to see the purple."

Screens matter very much. Sometimes a wide-gamut screen with a lot of saturation can be very useful for judging color problems. Other times a very low-contrast screen with a low gamma value can reveal otherwise-invisible problems in dark areas of a photo; a contrasty screen makes them invisible. It is useful to look at stuff on both kinds of screens. And it is best to calibrate and profile one of your monitors.
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Lou Jost
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