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Here's a shot from (I think) Petrified Forest National Park, made a few years ago.

Here's a photo made near Aspen, Colorado. Shot with 210 mm Rodenstock, 4x5 TMX.

Hi Stephen,

I attempted to respond earlier, but it appears that post got lost in the ether. I'll try again...



In fact I have performed many more tests than shown in the plots I...

Thanks everyone for the helpful responses.

I exposed and developed Tmax 400 in parallel with the TMax 100 that I plotted in this post, I just haven't gotten around to measuring the densities of...

Sandy, is Tmax-RS one of the developers you've used with Tmax 100?

Perhaps I've been barking up the wrong tree--I need to try D-76 at some point.

Here are my paper test results. One very important point--I measured transmission densities on these prints rather than reflection densities. (I'm in the market far a reflection densitometer but...

That sounds right to me. Of course, to get an exposure of 0.001 lux seconds doesn't necessarily require an exp. time of 0.001s--that would only be the case if the light intensity were 1 lux.

I will check out that link--thanks.

My goal is basically what you describe. Aside from issues with the shape of the characterisitc curves, with my testing procedure I have determined the...

Thanks Drew, that's good info to have. Are you aware of a film-developer combo that is more linear? Are there any curves you'd be willing to post?

I think Kodak and other manufacturers prefer to work in absolute units. I presume that manufacturer's labs use calibrated light sources to make this possible. For an exposure the standard is lux...

The main purpose of the test is to determine development times for different subject brightness ranges--standard sone system stuff. Also there could be a small film speed correction for different...

I have to apologize--I might be using the term 'contrast index' incorrectly. What I am plotting is basically the slope of the individual curves: D per unit zone. I don't see how you get 0.6-0.7 from...

Oh, and for what it's worth, here's the plot that I'm extracting development times from based on the curves I measured.

Recently I've been testing Tmax 100, and I was hoping to get some advice/feedback on the results. I attached a plot. I'm puzzled by the decrease in contrast that shows up around zone IV, which gets...

Hi Dave,

I installed a fairly large in-line exhaust fan in the garage--a Panasonic rated at something like 400-600 cfm. The inlet and outlet are 8" ducts. I ran the inlet 8" duct along the wall...

The overall wet-side length was pretty much dictated by the space I had to work with. Didn't make sense to me to not use the whole length for sinks, and it feels luxurious to have the space. It's the...

Indeed I could use some pointers in that regard. I managed to tidy up the darkroom for those photos, but you should see the rest of the house!

Thanks Robert for the compliment, and also for the info on Beseler. B&H still lists this item for sale, along with at least one other merchant (Calumet?) but perhaps they haven't gotten word yet...

Thanks Jan!

Thanks for the welcome Allen. I've been purusing the forum for a while now and have learned a lot. It's really a great resource.

My first post on the forum--greetings all!

I just spent ~1 yr. building this darkroom. I enclosed a section of our garage, about 8' x 21', and fortunately there is a little room left over for the...