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[OM] UV or not UV, that is the question

Subject: [OM] UV or not UV, that is the question
From: Mike Gordon via olympus <olympus@xxxxxxxxxxxxxxxxx>
Date: Tue, 11 Jul 2017 19:41:13 -0400
Cc: usher99@xxxxxxx
Traveling to high altitudes and don't want any blue casts on my Thunder Dragons.
With film,  UV filters are usually important, but with digital even at high 
elevation, not so clear cut.  Don't want any unnecessary air/glass interfaces 
degrading the image.  Some Canyon lenses for example say use them to render the 
lens weather sealed and do seem to help avoid haze/blue casts
but likely exact cam/ lens dependent.  Sometimes the sensor stack filter 
characteristics are known to some degree but it is difficult  data to find.

http://www.beyondvisible.com/BV3a-ICF.html

Many recent Oly sensors have   allow more near UV/violet in the sensor and use 
either coatings or lenses designed to prevent aberrations in these wavelengths 
to prevent problems.  When using some Panny lenses the purple blobbie problem 
can appear.

http://alanwatsonforster.org/writing/mft-purple.html

Perhaps it will take a few shots in the  field to determine but can be tough to 
decide on the fly.

Unfiltered Mike




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