On Saturday, June 15, 2013 12:51:19 PM UTC-6, Savageduck wrote:
On 2013-06-15 09:25:16 -0700, said:

HELP!?? Vintage lenses OK.



Why do you need a "fish-eye" faster than f/2.8?

I'm trying some "creative" wide/ultrawide starry sky imaging on some digital cameras and I wanted to gather as much light as possible.

I appreciate your insight on fisheye vs. uwfov and have been experiencing these design differences first hand. I've currently acquired used copies of the Nikkor 10.5, 14 and the 16.


I was led to believe that Schneider, Voigtlander, Leitz and perhaps Century all made extremely low F# UW or Fisheye designs in years past but I'm having a tough time finding much more than casual allusions to such.. and I'm not even sure they made them for FX full format cameras.


The Nikkor 14mm f/2.8 is not a "fish-eye" it is an ultra-wide angle

lens. There is more to a "fish-eye" lens than just being a wide angle.

Typically the idea is to capture a 180 degree field of view and that is

usually attained by a combination specialized lens construction

imparting a spherical distortion beyond that imparted by an ultra-wide

angle. I seriously doubt that you will find a "fish-eye" lens faster

than a f/2.8 as it is not usually needed.



Nikon has two dedicated "fish-eye" lenses, one DX & one FX.



The Nikkor 10.5mm f/2.8 is their current DX "fish-eye" offering. Their

FX "fish-eye" is the 16mm f/2.8.



http://www.nikonusa.com/en/Nikon-Pro...%252F2.8D.html





There are several other dedicated "fish-eye" offerings such as this one

from Tokina.

http://www.tokinalens.com/tokina/pro...afdxnhfisheye/





--

Regards,



Savageduck