Polaroid filter vs CPL filter
Mar 26, 2012 12:07:06 #
Manny Jay
Loc: Colorado
Okay, so now I have a CPL filter but I need to know what is the difference in the use a Poloroid filter against the use of a CPL filter, besides that the CPL filter consists of two filters in one. Also, what are the advantages of the CPL filter? I know about Poloroid filters. Please help. Thanks.
Mar 26, 2012 12:14:48 #
Read about a few common filters here: FAQ: Photographic Filters
http://www.uglyhedgehog.com/t-26502-1.html
By "Polaroid filter", I assume you mean a Linear Polarizing filter, which works much like polarizing sunglasses. These were popular for film cameras, but have limitations with DSLRs.
A "CPL", or more correctly, a "CPF", is a Circular Polarizing filter (not a lens), which provides the same polarizing effect, but does not effect Auto-Focus nor metering of DSLRs.
BOTH are single pane filters. A dual pane polarizing filter acts like a variable Neutral Density filter, depending on degree of parallel-alignment or cross-alignment of two linear polarizing filters.
http://www.uglyhedgehog.com/t-26502-1.html
By "Polaroid filter", I assume you mean a Linear Polarizing filter, which works much like polarizing sunglasses. These were popular for film cameras, but have limitations with DSLRs.
A "CPL", or more correctly, a "CPF", is a Circular Polarizing filter (not a lens), which provides the same polarizing effect, but does not effect Auto-Focus nor metering of DSLRs.
BOTH are single pane filters. A dual pane polarizing filter acts like a variable Neutral Density filter, depending on degree of parallel-alignment or cross-alignment of two linear polarizing filters.
Mar 26, 2012 16:44:18 #
Mar 27, 2012 07:05:28 #
I recall a study using the combo of polarizing filters to make a variable density filter indicated there was a problem ... the density was not uniform. The however, in this case may be the order in which the filters were stacked or the exact types of polarizing filters used in that study.
The reason I use the "may be" is that polarization is not as simplistic as I thought before Mr. N-72, as he often does, rattled my Kage of Knew-Knowledge. The apioptics article is most interesting specific to polarized filters. Cambridge is a general article on filters. Cambridgecolor is a great site for a lot of informative info.
Mr. N-72 has further complicated my life and jeopardized what little $ I have left! Prompted my his get readin up on filters stimulus, I now find that I can get, but not afford, an IR Polarizing filter for shooting my IR!!! humm, I will try my circular before and after my 720 nm filter.
Circular Polarization is simply put a polarizing filter followed by a randomizing filter that un-polarizes the light reaching the sensor.
PS: your laptop screen is a great source of polarized light!! All sorts of special-effect possibilities for photography there in combo with a pol filter on your camera!!!
http://www.apioptics.com/circular-polarizers.html
http://www.cambridgeincolour.com/tutorials/camera-lens-filters.htm
The reason I use the "may be" is that polarization is not as simplistic as I thought before Mr. N-72, as he often does, rattled my Kage of Knew-Knowledge. The apioptics article is most interesting specific to polarized filters. Cambridge is a general article on filters. Cambridgecolor is a great site for a lot of informative info.
Mr. N-72 has further complicated my life and jeopardized what little $ I have left! Prompted my his get readin up on filters stimulus, I now find that I can get, but not afford, an IR Polarizing filter for shooting my IR!!! humm, I will try my circular before and after my 720 nm filter.
Circular Polarization is simply put a polarizing filter followed by a randomizing filter that un-polarizes the light reaching the sensor.
PS: your laptop screen is a great source of polarized light!! All sorts of special-effect possibilities for photography there in combo with a pol filter on your camera!!!
http://www.apioptics.com/circular-polarizers.html
http://www.cambridgeincolour.com/tutorials/camera-lens-filters.htm
Mar 27, 2012 14:17:45 #
"Cambridgecolor is a great site for a lot of informative info."
Thank you depullum!
Since following your link to Cambridgecolor I've been enthralled; peeling back layer after layer of techinical advice.
Thank you depullum!
Since following your link to Cambridgecolor I've been enthralled; peeling back layer after layer of techinical advice.
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