Hi there i have just one question, if the camera you are using can focus through the IR filter, is there any need to expose for the iso settings you mentioned?
Hi Ray –
Thanks for an interesting question.
My initial reaction was that metering through the R72 filter would not work, since the meter is calibrated for visible light vs. infrared light. But this is something that is easy to test, so I ran a quick experiment.
With three of my film bodies (Pentax Mz-S, LX, and Pz-1p) metering through the R72 filter was pretty accurate. With the ISO set to 400, metering through the R72 produced an exposure within ½ stop to metering at ISO 6 with no filter. I imagine that different camera meters vary, so run the same test on your camera. Using the Rollei IR400 with the #25 filter I found exposures at ISO 200 to be optimum, and ISO 3 was acceptable for shooting with the R72 filter. So I can see shooting at ISO 200 and letting the camera just meter through the filter.
But – you probably should test your filter to see how it meters when the R72 is in place.
Regarding auto focus through an IR filter – in shooting digital IR I found that the camera could easily auto focus through the filter. But I also found that it was way off when I looked at the distance scales on the lens. For example, focusing on a very distant point, which should be at infinity for non-IR shooting, would lock in at 7-10 meters with the IR filter in place. I’ve taken to just focusing in visible light, and then manually adjusting the lens to focus a little bit closer for shooting with the IR filter in place.
If you have a lens with IR focal points on it, test you camera’s auto focus to see if it is close. If you don’t have a lens iwth IR markings on it, put the IR filter in place and autofocus one a point that should be at infinity. If the lens locks in significantly closer than infinity, the AF is probably not working through the IR filter.
Well Mark I finally managed to develop the roll (rollei 400) last friday. Here are the scanned results (The delay was the scanner actually, just picked it up friday).
Developed the roll in rodinal 1:50, 13.2 minutes, 25 degrees(used the first mixture for a roll of 120). Fixed for about 40 minutes (having problems with ilford rapid fix).
I will admit that defer to your original observation, that the rodinal is grainy, however i was expecting some grain (iso 400) but it also is kind of moody (which i like) will definitely try the hc-110 and dd-x in the future. Picked up some more film last week also along with the ilford sfx, so i will also let you know how that pans out. Will have to defer to my 24-105 no more ultra wides for the moment (not happy).
Anyway sorry for too much detail, but when I posed the question to you last week I was half way through the roll (at iso 400) so I decided to stick with that.
Just some other observations, focussed through the 720nm filter (no post adjustments on the meter, read direct off camera) however focus was set to infinity (IR infinity taken from first shot then set manually except for leaf picture, guessed distance and compensated). Sounds like a lot but easy with an ultra wide lens.
Another thing the I left my camera with film in car 2-3 times got hot (didn’t affect film), rewound roll midway through because was changing for another film, put in freezer for 3 weeks came back, shot with cap on to point where I stopped, camera got hot in car again! Unloaded and loaded in daylight, point being, I know it is only my first roll, however I’m really tough on my equipment and materials and I think I more than put it through its paces for during this time and proved that it is more durable than you would think.
Anyway I’m going to try to upload some results now. All shot with eos 1n and 16-35mm, which i dropped sunday night, camera lcd smashed, lens filter ring dented, (can’t fit filter on it). Anyway i’ll figure something else in this department.
Sorry just figured I can’t upload pictures, how do I do this?
Thanks in Advance,
Hi Ray -
Thanks for the update. Sounds like the through the lens metering worked out OK. Do you know what ISO the through the lens metering worked out to be? My ISO 3 - 0.5 seems to be a stop or three slower than most people are shooting this film at.
Unfortunately, I don’t have a facility for folks to upload photos here on the blog - if you can put them up on the web someplace else, a link to them would be great. I’d be very interested to see what kind of results you are getting!
Hey Mark check out flickr ray_kinsella, I think I put them in the new york section but they’re all marked ir anyway. Some boring shots in there but just wanted to get the roll developed!
Hi Ray -
I enjoyed the IR photo set - you seem to have gotten a pretty decent IR effect in foliage, plus nice black skies and water. Did you use the R72 filter for all?
Hey Mark I left you a comment on your flickr mail regarding the above, did you get it?
Hi Ray - About SFX? I did get it and shot you a reply from my regular mail (I assumed that it was going to the right place…) I’ll forward it on to you.
I shot out my last couple of rolls of Rollei yesterday - scanning them now.
Get them posted Mark, I haven’t shot any of sfx or rollei for that matter in a long time, I’ve been swamped at work so haven’t been able to commit to any real degree as I would like.
I just got my hands on a large format calumet 4x5 and I know rollei makes a 4x5 negative so should be real good, I’ll keep you posted.
Comment from: Gary Wright [Visitor]
If you shot F16 @ 1″ in direct sun, that means you shot at 32iso. The Hoya R72 filter only has a filter factor of 5 stops. If you felt you needed to increase the exposure beyond five stops that is because of Rollei’s sensitivity to IR, not how much light the filter is blocking.
This is why we apply ISO ratings to base film in order to avoid confusion.
Kodak is one of the best camera’s that gives photos that back in the day look.
Comment from: pauline mack [Visitor]
fantastic shots - once i master b&w infra red I cant see me using anything else for landscapes
Comment from: Garrett Welden [Visitor]
How much of an enlargement were you able to attain before noticing grain?
Garrett - Grain is present in even small prints but does not seem to overshadow the detail in the image until you go beyond 11 x 14 or so. Depends a lot on the exposure.
Comment from: Rick Jack [Visitor]
All the information you’ve posted is very helpful. I found some of this film in my refrigerator and want to give it a try.
If I understand correctly using a 720nm filter is like shooting at ISO12?
I intend to use a hand held light meter and bracket, so about 1/30 @ f8 is a good starting point in bright sun?
I didn’t know the 35mm film had a dye layer, thanks for the heads up. I guess I’ll try a piece of the leader in water first. I haven’t come across a film with a dye since the 1970’s.
I’ve been shooting IR in digital and miss the film look.
I just wanted to thank you for motivating me.
Hi Rick -
I think that 1/30th at f8 in bright sun - approximately ISO 32 per the sunny 16 rule - would be a good starting point for IR400 and an R72 filter. But, as noted above I needed to use much longer exposure times than expected to get the full IR effect. You might want to try metering through the R72 filter mounted on your camera / lens. I was skeptical of this approach but found that it works well. I wondered if the camera meter was sensitive to IR light, but it worked fine for the camera I was using. Comparing adjusted light meter readings to readings in camera through the R72 would be interesting.
The R72 filter blocks most of the visible light and allows infrared to pass through. Taking a meter reading from visible light and then adjusting it will work if there is a correlation between the visible light and IR light. I don’t think that correlation is very tight. IR seems more directional and in experimenting I’ve noted that simply changing the camera’s angle in relation to the sun can have a significant effect on IR light while having little effect on visible light. I sometimes use an IR converted DSLR that relies on a visible light metering system, and see this all the time. The meter reading in camera, based on visible light, changes little between setups, but the results in IR can vary significantly.
So, whatever you do with a handheld meter will be an approximation. Through the lens might be better.
Hope you get some great shots!
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