if john cook were still with us, he would probably chime in
( his article is a few down )
i miss john, he was brilliant, and nice and loved to tell
stories of his days in hollywood ...
I also own Omega View 4x5.. Used a Toyo in school. Been a while.
Bellows measuring? I go from lens board to film plane using the dressmakers tape measure sewn into the edge of my focussing cloth.
Photography, the word itself, invented and defined by its author Sir John.F.W.Herschel, 14 March 1839 at the Royal Society, Somerset House, London. Quote "...Photography or the application of the Chemical rays of light to the purpose of pictorial representation,..". unquote.
A different way to do it....
Try a Kiev 88 metered prism - gives you a reading directly from the ground glass. Very nice angle on the eyepiece. You can make a cardboard frame to eliminate stray light (or better still stick your head under the dark cloth). Don't forget that you will need the battery compartment converter. Experiment a bit using a reliable hand held or spot meter - or your digital camera - to check readouts and adjust as necessary. Mine works without the need for adjustment. Some scope for moving around the ground glass screen on 5x4, more (obviously) on 5x7 and 8x10 etc. Very useful for close up/macro work once you get the hang of it. If you can't get a reading (green light) increase the film speed setting until you can and then do the easy mental arithmetic to get the correct exposure for the film you are using. Through the lens metering on a monorail or technical/view for 30-50 quid (e-bay prices). Got mine from the Ukraine in first class condition 35 GBP + 9.50 GBP for the battery converter. As far as I know the Kiev metered prism one of only a few that work indepently of a camera. The Mamiya C220/C330 finder is another, but they are relatively expensive - twice the price and they lack the angled eyepiece.
Originally Posted by ToddB
Oh, and if you use it in the horizontal position it turns your image the right way round...
Cornball or not use the method that works best for you, a millimeter scale on a monorail makes it very easy for me. For my 120mm Nikon for example, I set the film plane 120mm from the lensboard, then note the distance on the monorail from inside to inside of the front and rear standard (30mm in this case) or outside to outside, does not matter. I've calculated what the BEF is at 13mm intervals (half inch) for several inches of bellows extension. Only after I have achieved final focus do I think about any possible extension, I quickly look to see if the inside to inside distance between the standards is greater than 30mm, if it's 56mm for example, then I know I have extended the bellows, just look at my little table and note the factor for a bellows extension from 30mm inside the standards to 56mm---------a one inch extension, +2/3 stop or 1.5x in this case---very quick. It only takes a few minutes to work out a small table for each lens that you have.
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Heck, If it looks like I have extended my bellows too far I just add a stop and move on! LOL!
At least with LF landscape, a bad day of photography can still be a good day of exercise.
BW means ball park like Vaughn said unless you are looking at big magnification then I use one of those calculator thingies like on Brunner's site. Chrome on the other hand requires measurement. Too expensive to screw up and too short a lattitude.
Technological society has succeeded in multiplying the opportunities for pleasure, but it has great difficulty in generating joy. Pope Paul VI
So, I think the "greats" were true to their visions, once their visions no longer sucked. Ralph Barker 12/2004
As others have mentioned, I measure from the lens board to the film plane. One day I did the math for my three lenses and marked a small retractable tape according to fstop changes by half-stop changes each lens a different color. I attached it to my lightmeter strap. Then happily forgot the formula - just measure and see the exposure compensation for that measurement.
I posted this in the bellows extension sticky. I measure from groundglass to lensboard and do the following:
I know this has been well and thoroughly covered but perhaps the way I prefer to do it will be of use to somebody. I don't really care for doing math in the field. I want everything prepared for me. I just sit down at my computer and fogure out the bellows extensions for a given focal length that will evenly correspond to stop corrections in 1/3 stop increments going out as far as the bellows on my camera will allow. I then make a small table with P-Touch tape and stick it to the lensboard for that lens. That ensures that I can simply set up the photograph I want and then choose the closest stop correction from the table.
Here's how the tables look, this one is for a 90mm:
+1/3 - 106mm (4 3/16")
+2/3 - 121mm (4 3/4")
+1 - 127mm (5")
+1 1/3 - 142mm (5 9/16")
+1 2/3 - 156mm (6 1/8")
+2 - 180mm (7 1/16")
+2 1/3 - 202mm (7 15/16")
+2 2/3 - 226mm (8 7/8")
+3 - 255mm (10")
+3 1/3 - 285mm (11 1/4")
+3 2/3 - 321mm (12 5/8")
+4 - 360mm (14 3/16")
+4 1/3 - 404mm (15 15/16")
+4 2/3 - 454mm (17 7/8")
I figure it by magnification as mentioned above (the ruler in the scene measured on the groundglass), but I don't always put the ruler in the scene if I think I can estimate it based on knowing about how big the subject is compared to the size of the format (i.e., a portrait where I can see both shoulders maybe with a little extra space is about 1:3 on 8x10"), but with higher magnification I'll measure it. I have a table taped to the backs of all my cameras, my light meter, and in my notebook to convert magnification factor to exposure factor. I've posted the table around here somewhere as a doc file.
For small formats, you don't actually have to measure on the groundglass. Just make sure the ruler covers the full width of the frame.