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View Full Version : Poll: Focal Length Ratio (Longest/Shortest)



Ron Marshall
28-Mar-2008, 11:46
To complete the set: What is the ratio of the longest to the shortest focal lengths in your 4x5 kit? For my kit it is 450mm/55mm = 8.18, so say 8.

Only 15 responses allowed, so pick the closest to your ratio.

Walter Calahan
28-Mar-2008, 12:22
Rounding up: 8.620689655172

Dan Fromm
28-Mar-2008, 13:21
12.6

Gordon Moat
28-Mar-2008, 13:22
You missed my usual combination for 180mm and 135mm. While I own a 210mm, it is a barrel lens I rarely use. So my kit works out to 1.33

Just took a look, and I have three different 135mm lenses, all various vintages, though the one in Copal 0 gets the most use. Then there is my HB&H, which is near that focal length, but without shutter. Afterwards is a Nikkor-W 180mm, which gets used often. Last is a 21cm Zeiss Tessar, rarely used due to lack of shutter. Anyway, my feeling is that if it sits mostly on a shelf, then it isn't really part of my kit.

Ciao!

Gordon Moat Photography (http://www.gordonmoat.com)

Joshua Dunn
28-Mar-2008, 17:24
Mine is 12.76. Why did the poll stop at 10?

Ron Marshall
28-Mar-2008, 17:53
Mine is 12.76. Why did the poll stop at 10?

Maximum 15 responses; I should have spaced it better.

jetcode
28-Mar-2008, 18:10
Rounding up: 8.620689655172

sounds like custom glass, my numbers came out smoother, and less scientific

Ole Tjugen
28-Mar-2008, 18:19
10. 650 and 65mm. That's easy to calculate. :)

Vaughn
28-Mar-2008, 18:22
It is 3 for the 8x10, and 1 for the 4x5. (and 1 for the 5x7 before it disapeared).

I do have a shorter lens for 8x10 than I used to calculate my answer, but it is a wee little micro lens that I bought on impulse and never put on a board (which would have me closer to 4.) 480mm/159mm

Whoops, just rememberd the massive 600mm Rodenstock I recently got and haven't figured out a way to actually mount (Why did Picker go with only 5.5" sq lens boards for the Zone VI 8x10?!)

So I have buggered up the poll. I should have answered 4 instead of 3. There goes the the poll's relaibility!:eek:

Vaughn

Eric Leppanen
28-Mar-2008, 18:33
My 4x5 has enough bellows to accommodate my Nikon 1200T, so strictly speaking my ratio is 1200 / 47 = 25.5. I have yet to use the 4x5/1200T combination in the field, but I'm sure that day will come...

Steve Barber
28-Mar-2008, 19:03
12.77, but not on the same camera. The maximum for one camera would be 6.67