TMY2 has a sharp cutoff in the red.How does the red filter behave with Tmax 400?
chicken, preferably a rooster... then examine the entrails of an owl ...
Many digital cameras provide that option. You switch to BW mode and then select the color filter. You use the camera as a director's viewfinder. I use my Olympus E-PL1 micro 4/3 digital camera for these things. See the instruction manual section below. What's nice is you can snap the picture and save it for reference as a jpeg while saving the RAW in color at the same time without the BW and filter effect. The digital camera can be used to select the right lens on my LF camera as well as doing preliminary composition. I record the settings verbally in video mode for transcription later at home and use it as a meter as well since it has center, matrix and spot metering options.
How does the red filter behave with Tmax 400?
TMax 400, along with TMax 100, sees rather far into red; so these have good linear response not only to 25 medium red filters, but also 29 deep red. Not all films do so well with deep red. I've noticed my B&W 29 is actually a little deeper and than my Tiffen 29.
But the best thing that could happen to Bill's, "Add this and that together, then maybe subtract that, then examine the entrails of an owl and the flight path of pelicans" ... would be to ignore all of that. Just go straight to the sum filter factor itself applied to a direct scene meter reading, and don't meter through the filter at all. So much simpler and more reliable!
With most pan films, the filter factor for a typical 25 red filter is 3 stops. LIkewise for a 29 red in the case of TMax films. But for other films, you might need 3-1/2 or 4 stops for a 29, or might more wisely avoid deep red entirely.
Bill, there are all kinds of granite, some of it dark absorbing heat, much of it light, reflecting heat. There are also big differences between deeply weathered and pitted rock and smooth glacially polish granite, which can be almost reflective. I grew up amidst granite and granodiorite, and have taken innumerable shots of it. I wouldn't worry much about IR. But if someone wants to play with the idea, they can simply buy some near-inrfared film (I don't know what is presently available - I once used Konica), along with a 29 deep red filter. More often, it's going to be foliage which is the big surprise.
I’d rather not carry a digital camera around just to use as a viewfinder. The advantage of the iPhone app is that I always have the phone with me, and it fits in a shirt pocket.
One of the problems I have is I can;t see the screen on a phone especially in bright sun. I keep the digital camera and a regular light meter both in my camera bag.
I have no problems seeing the screen on mine, even in the brightest sunlight.
The phone has lots of other uses too. I have a light meter app in case my hand-held meter dies or I lose it. I use it to take notes, using either the keyboard or voice dictation. I use google maps to drop pins to mark the locations I photograph and I use the camera to record the overall location. I use the calculator app to calculate bellows extension factors, etc.
Which app do you use? Does it work on Android phones? Does is have histogram and blinkies?
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