India Point Park

India Point Park
by matt-ball                

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May
31
comment Why is aspheric glass expensive?
@mattdm: That article is the best answer I've seen yet.
May
31
comment Why is aspheric glass expensive?
@dpollitt: I saw and responded to that comment in that question. That doesn't make sense -- paraboloids and hyperboloids can be ground using simple circular motions too, because they're still symmetric with respect to the center axis of the lens. (Hence my confusion)
May
31
comment Why is aspheric glass expensive?
Putting the glass on a lathe-like device though is sufficient -- it's not like aspheric designs are asymmetric with respect to the center axis. Sure, you could get a "round" pot by hand, but perfectly spherical? Even spherical elements are ground to much much much higher levels of precision than are possible by hand.
May
30
comment How does a spherical lens differ from an aspherical lens?
Erm, why can't they be ground by a natural rotary motion? Aspheric lens elements are still symmetric across the center axis; so any technique that works for spheres should work for paraboloids as well.
May
30
revised Why is aspheric glass expensive?
added 22 characters in body
May
30
asked Why is aspheric glass expensive?
May
30
awarded  Nice Question
May
23
accepted Why would one want to include the original RAW inside of a DNG?
May
7
awarded  Nice Question
May
4
awarded  Nice Question
Apr
22
asked Why would one want to include the original RAW inside of a DNG?
Mar
1
accepted What kind of camera bag would I look for to allow fast lens swaps?
Feb
29
comment How can I improve shots in the dark, when tripod or flash are not available?
I wish it was tungsten light :( Sodium lighting sucks! +1
Feb
29
comment How can I improve shots in the dark, when tripod or flash are not available?
Monopod won't help; it has the same problem the tripod does (even if the camera isn't moving, the players are)
Feb
29
asked How can I improve shots in the dark, when tripod or flash are not available?
Feb
19
awarded  Good Question
Jan
17
awarded  Quorum
Jan
13
comment Could a filter damage the curved front element of the Canon EF 100mm f/2.8 Macro USM?
Before using a UV filter just for protection, you may want to consider photo.stackexchange.com/questions/1393/… photo.stackexchange.com/questions/57/… and lensrentals.com/blog/2008/10/front-element-scratches
Jan
10
awarded  Popular Question
Jan
4
asked What kind of camera bag would I look for to allow fast lens swaps?