As mentioned, I wanted to try out two budget IR filters, by Kood and Zomei. I already had the latter in 67mm for use with 35mm gear, and got the Kood in 82mm for use with the large format gear. I shot three scenes, taking a shot with each filter. On the first, the sunlight was okay but not especially strong (late afternoon), and on the second (late afternoon the next day), it was better while I was setting up, but it went a bit cloudy when I took the photos (very thin, hazy cloud). The third was quite a bit more sunny (middle of the day, and sunny). The results were a mixed bag...
The top row are with the Kood filter, and the Zomei underneath. The last shot with the Zomei was a fail - I must have loaded the film into the holder incorrectly, and only found out when I put the dark slide back in and got the sound of buckling film. The dark slide wouldn't go in all the way, so it was knackered.
All shots were metered at 6asa, and processed in HC-110 at 1+49 for 12 minutes, 10 secs agitation every minute. There is a noticeable difference between the filters - I'd say the Zomei could easily do with another stop compared to the Kood. Viewed as positives...
The first two pairs aren't particularly IR in that there is little Wood effect. Again, the difference between the filters is apparent - in the first pair, the Kood seems to have done a bit better, although it's hard to say whether the foliage looks lighter because the image is more contrasty. The last shot does have the Wood effect, though - here's a scan of that...
Overall, it's quite contrasty - there is virtually no detail in the shaded area of the road, while the highlights have pretty good density on the neg. The sun was coming from the left and a bit behind. The trees on the left are mostly in shadow, while the one on the right was in open sunlight. Note that bits of the foliage on the left are bright where the sun got through. The right-hand tree has plenty of Wood effect happening (note how dark it is in the shaded bit near the bottom).
So, after this first experiment, I would say 6asa was about right for exposure index, and that the development was in the ballpark. As mentioned, it's maybe a bit too contrasty, but the lack of detail in the shaded part of the road probably has more to do with a lack of IR being reflected from it. Zooming into the foliage on the full res scan, it looks fine. As for the filters, I'd have to say that the Zomei doesn't seem to be as good as the Kood, although I wasn't able to compare it in shots taken in the best conditions.
