But the specs! The specs will sell it. The ignorant will buy it.
The sensor is 1/2.5 (0.4") says so right in the specs.
--
John Francis wrote:
----- Original Message ----- From: "John Mustarde"
Sent: Saturday, June 26, 2004 7:10 PM
Subject: Kowa Prominar TD-1, 3mp, 450-1350 f2.8-4 zoom
450-1350/f2.8-4... Now that's a zoom. But how can it be? I
thought
1350mm/f4 would require a front element about 337mm in diameter.
It's a 450-1350mm equivalent. Now you know why I think the entire "equivalent to what?" concept is retarded.
It appeard the sensor is someting like .4" x .3 inches. Lets presume that they are talking equivalent to 35mm, although they don't say for sure. This would make a 5mm lens approximately the standard focal length, and the real focal length of this piece would be something like 45mm-135mm.
Off by a little, there - 0.5" (the diagonal of a 0.3" x 0.4" sensor) is not quite the same as 5mm.
A 0.5" diagonal is a little over one quarter of the diagonal of 35mm. That would mean a lens of about the same size as a 35mm 100-300. There's no way that thing has a front element the same size as a 300/2.8, so the sensor must be significantly smaller - my guess would be at most half that size. One quarter the linear dimensions of the *ist-D sensor for 3+ megapixels means a pixel density eight times that of the *ist-D; the signal-to-noise ratio must be terrible!
-- graywolf http://graywolfphoto.com/graywolf.html
