so I am new to LF and am using 4x5 Foma 100 (live in Germany so it is inexpensive). We took the camera out yesterday and it was a bumbling affair, no light meter, no watch, only a slight understanding of recip, and then the battery died in our Rollei...All in all an eventful day. with the DSLR we metered a shot for ISO 100, f22 at 15 secs and then my brain started to fry.
I am technical in nature...doing IT for a living and used to fly for the US Army but when I look at Foma's chart:
Schwarzschild effect
Exposure (seconds) 1/1000–1/2 1 10 100
Lengthening of exposure 1x 2x 8x 16x
Correction of aperture number 0 -1 -3 -4
I get that the exposure is a factor of ten but I have no idea how to fill in the blank spaces between 1, 10 and 100 seconds. I have scrounged the forum here and have read quite a bit on outside forums/websites that talk one through reciprocity so I grasp what is going on and why this is an issue but for the life of me I am not having the light bulb moment that will enable me to figure this out on my own.
So I am approaching the forum, with me hat in hand, and am begging someone out there to enlighten me, provide a spark of some sort, so I can get through this and make some reciprocity charts.
Many thanks
Erick
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