For small increments, like 1/12 stop, there isn't much if any difference between a linear progression and a logarithmic progression. The smaller the stop increment the more linear the progression - the basis of differential calculus, really.
A 1/12 stop 5-strip test would start out at a 6% step and finish at a 7% step: 10 seconds, 10.6 seconds, 11.2 seconds, 11.9 seconds, 12.6 seconds. Without an f-Stop timer one might as well set the timer to 0.6 seconds (or 6% of the base exposure (though 5% / 10% are easier on the grey matter)) and be done with it.
A 1/12 of a stop change in print exposure is roughly equivalent to a 1/6 of a zone / stop change in negative exposure (midtones, regular development, #2 paper). Control over exposure can be far more precise when printing than when shooting. Printing can deliver what the Zone System only promises.
Did you (a few years back) sell a f stop overlay for the Gralab timers?
Did you (a few years back) sell a f stop overlay for the Gralab timers?
Sell??? It's FREE - along with quite a few f-Stop timing/metering support files http://www.darkroomautomation.com/support
along with quite a few f-Stop timing/metering support files
Mr Lambrect:
Did this modification help much? I have been just using a regular timer and 5 second intervals for my first "test strip" for a long time. When I learned the "close time" I then shortened my interval. My gray lab was broken after a long while and I just worked by intuition, it worked OK
Sell??? It's FREE - along with quite a few f-Stop timing/metering support files http://www.darkroomautomation.com/support
I do too.I was in the fortunate situation to have started with f/stop timing and needed no convincing.Ralph, I do hope that lenshustle will look at your link and begin to re-think his attitude to fstop timing
pentaxuser
But no illustrated introduction to those who are new to the subject (hint, hint).
Ralph has already done a wonderful job of this in Beyond Monochrome. Anything I did would just be a poor imitation of Ralph's book.
After reading Ralph's work is there any aspect that remains cryptic?
Much of my writing comes out sounding like an engineering textbook. Spend a lifetime writing engineering documents and look what happens to you - crippled for life.
If you are doing f-stop printing, are you ignoring depth of focus?
If you are doing f-stop printing, are you ignoring depth of focus?
I seem to have mis-understood f/stop timing, so why give it this name if you are not changing f/stops?
I seem to have mis-understood f/stop timing, so why give it this name if you are not changing f/stops?
That is why "f/stop timing" is a bad name. Most photographers are not engineers, and to them it sounds like we're changing the aperture. Misleading.
I used "stops" for time in my timer/controller for LEDs, abbreviated as "st" as the time "4.0st" illustrates below:
View attachment 317030
But when one selects and changes time, the controller also displays seconds:
View attachment 317031
For me, this is clear. It cannot be confused with f/stops (aperture) on the lens.
The LED-brightnesses on the top row of the display for red/green/blue are also in stops (10=max, 9=half bright, 8=quarter, ...). The steps in test strips (via the Strip button) progress in stops, not seconds. With everything in stops, it's easy to interchange settings, such as dimming the LEDs and exposing longer to compensate. Yesterday, Ralph Lambrecht posted a chapter from his book, Way Beyond Monochrome, detailing additional advantages of stop-based timing.
it helped me understanding f/stop timing.
Once you start using the method, you surely wouldn’t be confusing time and aperture. It is only those who don’t know what is involved who are unclear.
Thanks, and I understand.
And thanks to Ralph for sharing!
I have and rely on the first version of his book, and recommend either version to everyone who asks.
But its nice to be able to refer people to a web resource as well.
Perhaps Ralph and his co-author would allow you to use a credited copy of the excerpt he uploaded on your site.
Thanks, and I understand.
And thanks to Ralph for sharing!
I have and rely on the first version of his book, and recommend either version to everyone who asks.
But its nice to be able to refer people to a web resource as well.
Perhaps Ralph and his co-author would allow you to use a credited copy of the excerpt he uploaded on your site.
I use an app or a chart. An f stop timer is probably one of the better investments a printer could make, that and a lab book for records.
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