I got a Konica 135 IR 750nm and I'd like to know if with only a R2 filter I can get good infrared efects or I'll really need a especific filter, like a B+W #92? Thanks a lot Hugo

-- Hugo Andrade Medeiros (hamed@navinet.com.br), October 23, 1999

Answers

Response to I really need an infrared filter like a B+W 92

In one of the books I have, the recommendation for Konica 750 is a deep orange (e.g. B&W #41). It has the advantage of being a lot brighter than 25A red or others. I use #41 almost exclusively with the Konica 750, and it works well for me. The Konica IR is kinda slow which is a typical good news/bad news. My base exposure is f11 @ 1/30 with the #41 and a bright landscape with lots of greenery.

The slowness of the film makes it (relatively) easy to handle, but makes a tripod desirable. I generally set the lens at the hyperfocal distance, bracket, and pray.

Good luck

-- Bruce Karnopp (karnopp@umich.edu), October 23, 1999.

Response to I really need an infrared filter like a B+W 92

I haven't shot infrared and I'm unfamiliar with the filter designations, especially B&W's nomenclature.

However, there's a place in Skokie, Illinois called American Science Surplus. They sell all manner of very interesting things, many of which could have/do have photographic applications, including a very large, semi-spherical infrared filter - i.e. it blocks everything BUT infrared. I have though of buying on from time to time but I really haven't mustered the interest.

It is, considering it's size and quality, quite cheap as I recall. I know they are on the web. Thing is, being military surplus, it isn't a conventional screw in glass filter, you'd have to rig some sort of attachment to use it. I believe it's in excess of 3" in diameter.

Hope this helps

-- Sean yates (yatescats@yahoo.com), October 23, 1999.

Response to I really need an infrared filter like a B+W 92

You can find the aforementioned monster filter here:

http://www.sciplus.com/cgi- bin/basket/940743896.7/experiment/27816.html

They call it their "Too Good Filter" and it's 5.75" in daimeter. But it's only $25.00!

-- Sean yates (yatescats@yahoo.com), October 24, 1999.

Response to I really need an infrared filter like a B+W 92

You should really get the B+W 092. I have 091 and 092, and the 092 gives the maximum performance from the film. 091 is the minimum red which I use with this film. My area has plenty of conifer (evergreen) trees and 090 (Wrattan 25) will not change their color. The 091 will make most species turn grey, and the 092 will render everything white. B&H Photo- Video has them in the $50 range.

-- Brian C. Miller (brianm@ioconcepts.com), October 25, 1999.