Darkroom Color Printing – Filter Changes & Exposure Times

I have a Beseler 23C III XL Dichroic enlarger for making color prints in my darkroom. I have been doing alot of research on the Internet regarding how adjusting Dichroic filters (CYM) impacts (or not) exposure time adjustments. I have seen all of the below:

  1. Dichroic enlarger heads do not require (or should not require)
    exposure adjustments when changing filter settings.
  2. Changing the Yellow (Y) filter setting does not impact exposure
    time settings but for each 1 unit adjustment of Magenta (M) or Cyan
    (C) should require the exposure time to be changed by 1%. Of
    course, I always set Cyan to 0.
  3. Others, broadly say that you should always adjust your exposure
    time when you adjust your filter settings.

Kodak follows #1 except for CP and CC filters where they state exposure times should change when filter settings change.

Any guidance is well appreciated. Thanks.

“Correct” way to add texture for a photo print in a scene. Fix “over-exposure”

Total beginner to Blender here, so please pardon my general ignorance.

I’m trying to render product shots of some photographic prints for my wife. I’ve bought an interior scene from evermotion which already had some prints on the wall, and am trying to substitute her photos for those prints.

To do this, I’ve deleted the meshes for the existing prints (they were using a texture atlas for all of the prints, which seemed like unnecessary additional complexity for now), added in planes for the new prints, and used a simple “image texture” material on them. This approximately works, but the photos look over exposed when I render — this is the problem I’m trying to solve.

Moreover, I’m a bit confused about what’s actually happening: she sent me JPEGs of developed RAW files which had already had exposure, tone-mapping, gamma, etc applied in Lightroom. My understanding of 3D graphics was that you generally wanted to work on linear data and then apply the tone-map and gamma to the final render. So I guess I’m not surprised that it’s come out wrong, but I’m at a bit of a loss to understand the best path to making it “right”.

Would appreciate any pointers on this! Thanks!

Very long exposure with large format camera

I’m interested about long exposure (around 5min exposure) photography with large format film cameras.

Apart from reciprocity failure, it seems to me that the biggest issue is stability against wind.

Is it even possible to do a 5 minute exposure with large format (mostly 4×5)? Does anyone have experience with this, if so any tips?

Does harm from radiation depend on exposure time?

We are trying to determine if a wireless device would be safe in terms of the radiation it emits. The device will be used next to the human torso and therefore we are looking into SAR Limits for torso. I have found FDA Sar Limits which are 8W/Kg/5 minute exposure (1g). Well, this is for MRI and the limits, according to FCC, for cell phones are 1.6 W/Kg.

My question is: how much the safe limit would change if we are exposed for 1 hour instead of 5 minutes? Does time matter for this? How?

What are the effects of enzyme exposure to high temperatures?

After proteins are exposed to high temperature and undergoes denaturation, will an enzyme’s active site return to it’s original shape and manage to function at the same level of efficiency as before?

Some background I wrote to the question:
I am just beginning to learn Cell Biology, I hope what I’ve written is correct.

When you raise the temperature of an enzyme, at first it will increase the efficiency of the enzyme’s activity, but eventually as the temperature rises, the enzyme with stop functioning and undergo denaturation, which means that the 3D formation of the protein is unraveled, so it doesn’t function anymore. From what I’ve managed to research, the high temperature changes the shape of the active site in the enzyme, which is what allows the enzyme’s activity in the first place.
I know that some proteins cannot be renatured (like adding heat to an egg will fry it and there is no way to unfry it), but some can be renatured (like heated milk, when it cools down the protein bonds will reestablish themselves).

But will the enzyme’s active site return to it’s original shape and manage to function at the same level of efficiency as it did before? Or is the damage permanent?

Jurisdiction in cross-state-border exposure

In Queensland, the Summary Offences Act 2005 states “A person who is so near a public place that the person may be seen from the public place must not wilfully expose his or her genitals so that the person’s genitals may be seen from the public place, unless the person has a reasonable excuse.”

Across the state border in New South Wales, there is no such statute; only a stricter test of obscenity in or near a public place. This doesn’t stop NSW cops arresting World Naked Bike Riders every year, but they have to let them go, every year.

So does one commit an offence if one stands in NSW and exposes oneself to a person in a public place across the border in Queensland? This isn’t as clear-cut as the stereotypical example of shooting someone across the border, since no offence has been committed by the self-exposer, in the jurisdiction in which s/he is standing. In the shooting case, the offence is murder, not doing or not doing something in a particular place.

Answers: No; if you’re in NSW, then NSW law applies and Queensland does not have jurisdiction or Yes; you committed a Queensland offence, even though you were not geographically in Queensland at the time.