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View Full Version : 40" 1016mm f5.6 Aero Lens by Bausch and Lomb



brendanbarry
27-Aug-2019, 06:03
Hi there,

I just came across a 40" 1016mm f5.6 Aero Lens by Bausch and Lomb. I'm wondering if anyone knows what the image circle of this lens might be and therefore what format it might cover?

I currently shoot with a range of Apo Nikkor lenses (610mm, 760mm, 890mm and 1210mm) with a camera I built out of a shipping container and also a caravan (camper) (https://vimeo.com/347942028 if anyone is interested!). I've shot (paper negatives and direct positive positive prints) with the 1210mm that easily covers 42"x42".

I'm hoping that this lens will at least cover 24"x24", the diameter is huge (over 7", which is way bigger than the approx. 5" of the 1210mm) but want to make sure it's image circle is big enough to work similarly. The 1210mm is only f12.5, so these extra stops will be very useful!

Many thanks in advance for any advise/guidance,
Brendan

Tin Can
27-Aug-2019, 06:40
2 days ago I was looking at published Nikon APO specs

Lot of useful info here (http://www.savazzi.net/download/manuals/Apo-Nikkor.pdf)

Pere Casals
27-Aug-2019, 06:45
I'm hoping that this lens will at least cover 24"x24"


Here it says that it covers 11x14 (https://www.etsy.com/mx/listing/722702031/vintage-huge-40-1016mm-f56-aero-lens-by)

Aerial lenses were usually made/optimized to cover the aerial film formats, and often very big glasses had surprisingly small coverages for the size.

The Jonel 100 that was used you record NASA rockets ascending had only a 80mm image circle, it's only a MF lens :) !

194818

__________


A "tinny project camera" for a 1780: https://www.youtube.com/watch?v=SCIzsFc1bt8

Corran
27-Aug-2019, 09:16
Is the 40" B&L Aero lens just a doubled-up version of the 20" f/5.6 version, which is fairly common?

The 20" version is a telephoto, and can be found mated to 35mm cameras. Mine was on an old screwmount Leica with a reflex housing. It covers much more than just 35mm though, and I believe it illuminates a massive circle. I held it up to my 8x10 and it certainly illuminated the entire ground glass. Quality/resolution unknown.

If the above is true, I would expect 24x24 not to be outside the realm of possibility, especially focused closer for portraiture. By "come across," does that mean you don't have it in-hand? Best to test it yourself. Image circle specs for original usage focused at infinity and with a designated resolution target don't tell the whole story.

Bob Salomon
27-Aug-2019, 11:44
Is the 40" B&L Aero lens just a doubled-up version of the 20" f/5.6 version, which is fairly common?

The 20" version is a telephoto, and can be found mated to 35mm cameras. Mine was on an old screwmount Leica with a reflex housing. It covers much more than just 35mm though, and I believe it illuminates a massive circle. I held it up to my 8x10 and it certainly illuminated the entire ground glass. Quality/resolution unknown.

If the above is true, I would expect 24x24 not to be outside the realm of possibility, especially focused closer for portraiture. By "come across," does that mean you don't have it in-hand? Best to test it yourself. Image circle specs for original usage focused at infinity and with a designated resolution target don't tell the whole story.

To see what it covers at infinity, or whatever distance you want, point it out the window in a darkened room, hold a large white sheet of board behind it, move the board away from the lens till you see a sharp image on it. That’s what it covers.
You could draw format sizes on the cardboard to make it easier to do.