I've just shot two rolls of the Rollei IR recently (one 120, one 135) and here's my experiences:
As a plain film (no filters), at 400, the negatives were a bit thin. Using no filter, yellow, orange or red, I'd say 200 is a better speed. Developed in Diafine 1:1 in a Jobo tabletop rotary 1500-series drum for 3+3 minutes.
With the Hoya R72 filter, and my Leica M6TTL's internal meter, I tested it at 400, 200, 100, 50 and 25 ISO and found that 50 worked the best, where for Efke IR820 I found ISO 25 to be the best with the R72 filter.
The grain is much nicer than the Efke film, but the IR effect is more subdued. The Rollei is also less scratch prone as a film than the Efke, which is nice. I'm going to finish my box of 4x5 Efke and see if I can get better luck with the scratches and then decide which one to stick with.
Here's a shot (on 35mm) with the Efke IR820/Hoya R72 (TTL meter set to 25): http://www.flickr.com/photos/drew_sa...7618657774764/
And here's a similar subject with the Rollei IR400/Hoya R72 (meter at 50): http://www.flickr.com/photos/drew_sa...7618657774764/
You still get dark skies but less glowy plants.
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