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This is just to show as a polarizer can reduce haze and bring colours to a subject ~12 km away. The lens is 1600mm x 1.5 (DX crop) = 2400mm.
No CPL filter:
Tower 12 Km away - no CPL filter by labecoaves, on Flickr
D300 + TC20EIII + Nikkor 800mm f/5.6 AIS IF-ED (=1600mm f/11) + tripod, ISO 200, f/22 at 1/80s.
With a Circular Polarizer filter:
Tower 12 Km away - CPL filter applied by labecoaves, on Flickr
This second image is with a Nikon 52mm drop in CPL.
D300 + TC20EIII + Nikkor 800mm f/5.6 AIS IF-ED (=1600mm f/11) + tripod, ISO 200, f/22 at 1/15s.
Te bluish haze cast is gone and deep/truest colours appears through 12km of atmosphere!
Just as a reference, this is the view of the same tower in the montain with a D3 + 200mm f/4 ais:
Early night at Pico do Jaraguá with the Nikkor 200mm f/4 ai-s by labecoaves, on Flickr
Early night at Pico do Jaraguá with the Nikkor 200mm f/4 ai-s
The "Pico do Jaraguá" is around 12 km from my balcony. The deep red can be attractive, but this is mainly result of air pollution by millions of cars.
D3 + Nikkor 200mm f/4 ai-s + tripod, f/8 at 2s of exposure, ISO 200.
Edited on Jan 20, 2013 at 10:24 PM · View previous versions