Have a look at the graphs in this article. There is virtually no difference
between UV filters and Hoya 1A/B filters. They all absorb most of the light
below about 400nm & not much else.
https://ww2.chemistry.gatech.edu/~nmakarov3/INTERESTS/Photo_Filters/index.htm
Alan C
-----Original Message-----
From: David J Brooks
Sent: Tuesday, May 06, 2014 5:09 PM
To: Pentax Discuss
Subject: filter ???
One of the several reasons i wanted to get the Pentax 17-70 was its
filter size. I have a number of 67mm filters and did not have to add
to the lot. Although the Sigma is a much nicer lens IMO even with the
reverse zoom, buit its a 72 mm filter. The salesman asked if i needed
protection, and i told him no need i did not want any more children
<ba dum>
I said i'm sure i have a 72 filter some were, ( opps they are 77mm)
and he said if not come back and he'll set me up, "JUST DON'T GET A
SKYLIGHT" he said. I did not ask him why he thought that way, but then
it started to think about it.
Why not a skylight for protection, is the UV1 better suited,??
Dave
--
Documenting Life in Rural Ontario.
www.caughtinmotion.com
http://brooksinthecountry.blogspot.com/
York Region, Ontario, Canada
--
PDML Pentax-Discuss Mail List
PDML@pdml.net
http://pdml.net/mailman/listinfo/pdml_pdml.net
to UNSUBSCRIBE from the PDML, please visit the link directly above and
follow the directions.
---
This email is free from viruses and malware because avast! Antivirus protection
is active.
http://www.avast.com
--
PDML Pentax-Discuss Mail List
PDML@pdml.net
http://pdml.net/mailman/listinfo/pdml_pdml.net
to UNSUBSCRIBE from the PDML, please visit the link directly above and follow
the directions.
