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!!!
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.
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