Does anyone know how there are made? Is it just two polarized filters stacked together?
Gale
Does anyone know how there are made? Is it just two polarized filters stacked together?
Gale
I think that's what they are. I bought a similar variable ND from B&H a couple of months ago and that's all it was. I ended up sending it back because it was hard to know how much density there was at any setting to figure exposure. My SHen Hao doesn't have TTL.
Kent in SD
In contento ed allegria
Notte e di vogliam passar!
The variable Polas also are color specific and pretty amazing.
Mark Woods
Large Format B&W
Cinematography Mentor at the American Film Institute
Past President of the Pasadena Society of Artists
Director of Photography
Pasadena, CA
www.markwoods.com
Bob, one is a circular polarizer and the other is a liner polarizer.
The Vari-n-Duo is my favorite filter!
"Nikon presents Nat Geo Moment Awards powered by Dell Xps" is back and once again, the photography contest is open to everyone - amateurs and professionals. This year's contest will be judged by Steve Winter - National Geographic Magazine photographer since 1991. The winner gets to assist Steve on a photo shoot in India and will also receive a Nikon D300s camera! So go on, capture your best moment and upload it to us!
http://www.facebook.com/natgeotv.ind...p_211586911533
In the case of the Heliopan Vario which goes from 0.3 to 1.8 density (1 to 6.6 stops) they are two of the new High Transmission Heliopan circular pols mounted back to back in a very thin mount.
I was considering one of these variable ND filters to reduce weight and clutter in the bag. As I think about it, I come to one important question: By doing this variable filtering with two polarizers, isn't this combination filter actually modifying the light instead of just reducing it's throughput? It would seem the same for Singh Ray, as well as Heliopan if they're both using polarizers.
Chris
First, the Heliopan in 67 to 82mm goes from 0.3 to 1.8 which is 1 to 1.8 stops. Sorry for the confusion.
No it only changes the density. If you screw it into a polarizer then you can increase the density by 1 stop (with the Heliopan High Transmission Circ Pol) or 1 2/3rd stops with other types of polarizers. The amount of density change with a Heliopan Vario ND is restricted to the working range as the filter is hard stopped at either end of the density range.
bob, I think you had it right the 1st time:
.3 llll .6 llll .9 llll 1.2 llll 1.5 llll 1.8 markings on filter
1 llll 2 llll 3 llll 4 llll 5 llll 6 # stops of light removed
if I'm wrong, please correct me
-Dan
Bookmarks