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View Full Version : Finally, a Beach Multi Focus Lens Advertisement


CCHarrison
5-Aug-2011, 13:38
New to me, a 1932 ad for the Beach Multi Focus Lenses.


Dan
Jon Shiu
5-Aug-2011, 14:12
Sounds like an amazing lens!

Jon
Mark Stahlke
5-Aug-2011, 14:20
That's an interesting lens.


It is difficult to realize that depth of focus and speed, heretofore considered diametrically opposite features in a lens, are now reconciled in one instrument.
Even at an exposure value equivalent to a lens working at F:3.3, the Beach Multi-Focal lens has an exceedingly great depth of focus - more than again as much as any other lens of equal speed and focus.
I wonder how they did that?
Steven Tribe
5-Aug-2011, 15:05
Howard Beach obviously had an exclusive agreement with Photons Inc.!
cdholden
5-Aug-2011, 15:36
That's an interesting lens.


I wonder how they did that?

I'm even more baffled at how the outside diameter of the flange is smaller than the inside diameter.
Brilliant!!!
willrea
5-Aug-2011, 15:52
I'm even more baffled at how the outside diameter of the flange is smaller than the inside diameter.
Brilliant!!!

It's one TARDIS of a lens.
Mark Stahlke
5-Aug-2011, 15:56
I'm even more baffled at how the outside diameter of the flange is smaller than the inside diameter.
Brilliant!!!Physics? We don't need no stinking physics!
Jason Greenberg Motamedi
5-Aug-2011, 16:12
That's an interesting lens.
I wonder how they did that?

It works on the same optical principle as the defocusing arrangement of a Dallmeyer Petzval--as you increase certain optical aberrations the apparent depth of field increases. In crude terms; since nothing is really sharp, more appears sharp. Regarding the flange, well, that really is a mystery.