OK- I'll play!

Large format macro. I did quite a bit of that for jewelry clients. Not that much extension like in the picture through- 48" maximum.

So...if you have a few of these handy dials (see attached images) you can get into the exposure ballpark as per bellows extension factor. Then add a filter (most chron films required a filter pack) and you have subtracted more light. If you are using tungsten lights with long exposures to compensate for the bellows facto,r that ain't the end of the puzzle. With old transparency films, long exposure brought on reciprocity law failure and color shifts so you sometimes had to add more filters.

You could do the math notice the formulas on the dials) or try to figure out the dials, so frankly, back in the day the best approach was a guess based on previous experience, test with polaroid- get the exposure right and the test for color- so we held the set until the E-6 came back forms the lab and go on from there.

The extension in that picture I estimate about 2.5 to 3.00 meters- that goes beyond the scope of the dials with say, a 15Omm lens on a 4x5 camera would cost you at least 6 stops. The bellows at the front of the camera is a compendium lens shade.

That photographer is well equipped for the job- he's using a Braun Hazy-Light with 4800 watt-second power supply. You need that kinda punch with diffused light when your bellows extension and filters are eating as much as 10 stops. We used similar lighting at my studio and oftentimes had to open the shutter, and in a darkened room with modeling lights off, do multiple flash popes to achieve adequate exposure. If I needed to bracket it cold be 5-pops, 10-poops, and 20- pops to bracket in 1 stop increments.

After doing this 10 or 15 ties I got to hone in on the exposure more expeditiously. On food shot, we still bracketed more because the set could no ber preserved until the lab work was done. We did this is 4x5 and 8x10.

For 8x10 we used an f/12.5 process lens- the 500-watt modeling lams seemed like candles on the ground glass. If you still had your eyesight at the end of the shoot you did get some sharp images.

Nowadays folks argue about "chimping" too much. What I wouldn't have given to have been able to "chimp" back in the bad old days.

I have 2 Wasabi batteries but have found that the Rav batteries are better as they are larger in lasting power. More amps per battery. Here is the quote from Amazon "Updated RAVPower LP-E6 LP E6N Rechargeable Battery Charger Set,2-Pack 2040mAh Camera Batteries Compatible with Canon EOS 5D Mark II, III, IV, 5DS, 5DS R, 6D, 60D,6D Mark II, 7D, 7D Mark II,70D, 80D" -2 batteries/ plus charger for $33 bucks. In my mind, the Rav has lasted longer in years also- I had a 7D from way back, so I have had batteries for many years. I do night shots plus time-lapse so I have a few batteries- The Rav are better to me!