Anyone looking for a 45 year old Zeiss tele lens? That's been dropped, and repaired with duct tape? Possible dust contamination which makes it more valuable? This doesn't make sense? It's been to the moon!
http://www.engadget.com/2016/04/20/forme...apollo-15/
http://www.rrauction.com/browse_gallery.cfm?category=69
Wonder how it would perform by modern standards. Might never find out as I'm guessing whoever buys this will probably end up keeping it in a glass case.
<a class="bbc_url" href="http://snowporing.deviantart.com/">dA</a> Canon 7D2, 7D, 5D2, 600D, 450D, 300D IR modified, 1D, EF-S 10-18, 15-85, EF 35/2, 85/1.8, 135/2, 70-300L, 100-400L, MP-E65, Zeiss 2/50, Sigma 150 macro, 120-300/2.8, Samyang 8mm fisheye, Olympus E-P1, Panasonic 20/1.7, Sony HX9V, Fuji X100.
Dunno if I am understanding things wrong, but a lens designed to work in air glass environment, will it work the same in glass nothing environment ?
Because of focus-breathing or what?
B)
No, because of the light refraction air/glass, try to immerge a lens in water without any housing will it function the same optically?
Water?
We (human beings/opticians), are used to using the general term "air to glass surfaces" as a way of saying;
"light passing through a refractive medium into free space".
On Earth in our case, free space contains air........... On the moon there is no air.... but light passing through refractive mediums into a vacuum is still same......only that the light rays are not degraded by air's refractive properties.....
(On Earth we call it focus breathing JoJu..........on the moon it's called focus (last) gasping)... :o
Quote:Dunno if I am understanding things wrong, but a lens designed to work in air glass environment, will it work the same in glass nothing environment ?
Look at the refractive index:
Vacuum: 1.0000
Air: 1.0003
Water: 1.33
Glass: 1.52 (Schott BK7)
So is the difference between air and a vacuum significant? For photographic purposes I'd say no.
<a class="bbc_url" href="http://snowporing.deviantart.com/">dA</a> Canon 7D2, 7D, 5D2, 600D, 450D, 300D IR modified, 1D, EF-S 10-18, 15-85, EF 35/2, 85/1.8, 135/2, 70-300L, 100-400L, MP-E65, Zeiss 2/50, Sigma 150 macro, 120-300/2.8, Samyang 8mm fisheye, Olympus E-P1, Panasonic 20/1.7, Sony HX9V, Fuji X100.
