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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