| Author | Thread |
|
|
04/12/2011 08:14:19 PM · #1 |
is this thing for real, how is the quality? Worth buying? Sounds to good to be true (probably is)
I'm picky so if there is any loss of quality at all with this filter please let me know. (sharpness, color)
Thanks |
|
|
|
04/12/2011 08:16:59 PM · #2 |
Ah..I had this idea a while ago and tried it out.
I took 2 linear polarizer filters and turned them at different angles. Worked like a charm. |
|
|
|
04/12/2011 08:19:50 PM · #3 |
Originally posted by PGerst:
Ah..I had this idea a while ago and tried it out.
I took 2 linear polarizer filters and turned them at different angles. Worked like a charm. |
Crossing the poles again are you Mr. Gerst? |
|
|
|
04/12/2011 08:26:25 PM · #4 |
Are you refering to the Singh-Ray variety? I wish I could afford this much for a filter right now.
singh-ray.com/varind.html |
|
|
|
04/12/2011 08:38:48 PM · #5 |
Quite. Looking for that alter ego....
Originally posted by bassbone:
Originally posted by PGerst:
Ah..I had this idea a while ago and tried it out.
I took 2 linear polarizer filters and turned them at different angles. Worked like a charm. |
Crossing the poles again are you Mr. Gerst? |
|
|
|
|
04/12/2011 08:56:04 PM · #6 |
They may vignette a little on wider angle lenses due to the thickness of the edge rings. Yes two polarizers are the trick for getting light reduction and having exact control of how much reduction you want. Be aware that two polarizers will take off about 3 1/2 to 4 f stops of light, even turned to their brightest.
|
|
|
|
04/13/2011 12:50:28 AM · #7 |
Originally posted by MelonMusketeer:
Be aware that two polarizers will take off about 3 1/2 to 4 f stops of light, even turned to their brightest. |
I don't think they cut off quite that much light ...
I recently experimented with two stacked polarizers (one circular, one linear); I don't know the absolute exposure reduction, but between the most "open" and the most opaque settings of the two filters was a difference of about 4 stops.
Be aware that using polarizers in this fashion can add a significant blue color cast, depending on the angle of the light source and the filters.
ISO 80, f/8.0, 2 sec (adjusted):  ISO 80, f/8.0, 4 sec, unadjusted: 
More discussion in this thread. |
|
Home -
Challenges -
Community -
League -
Photos -
Cameras -
Lenses -
Learn -
Help -
Terms of Use -
Privacy -
Top ^
DPChallenge, and website content and design, Copyright © 2001-2025 Challenging Technologies, LLC.
All digital photo copyrights belong to the photographers and may not be used without permission.
Current Server Time: 08/02/2025 08:23:37 AM EDT.
