[HUG ] Re: swc for sale?

The FL "equivalence" issue may already be dead, but I want to add this.
We do need to understand what we are talking about, and we probably all do. It think we all know that the issue here has to do with the portion of the image circle in which the image is collected. That is the only difference between a "full frame" image and those of the smaller framed images. We say that a lens is "equivalent" to one of longer focal length because it "sees" and records the image that a longer focal length is normally required for (if the image collectors were the same size). A given lens does not change its focal length nor its angle of view just because the image area has been changed.
When you crop a negative to use only the central portion for a print you are doing the same thing that these smaller sensors are doing. The question remaining is how good is an image under any of these circumstances? I would ask if the perspective effects of a smaller sensor are the same as those of the longer lens. I think the answer is yes. Likewise, is the perspective of an 80mm lens in a 500CM the same as a 50mm lens in a Leica? Are they both really "normal" lenses? Again, I think the answer is yes, but both these situations are worth thinking through and I would appreciate being set straight by anyone who knows more about this than I. 

Sherman Bloom





On Jun 16, 2008, at 9:17 PM, Frank Filippone wrote:


Eric.... this is, in my opinion, flawed thinking....
Technical terms should be used correctly. If they are not, the meaning 
becomes obscured.....
Try "APO" for example of a word that has so many different meanings that its 
use has become useless......

Angle of view is precise, descriptive, and independent of format size.
Hasselblad always speced their lenses this way...... and others used to put 
angle of view in the ads and specs of their lens lines ( Nikon, Canon,
Leica, and others).

And Yes, I do remember the "Metrification of the USA".  Utter Failure.

Frank Filippone
red735i@xxxxxxxxxxxxx
angle of view make so sense in these days of a melange of sensors sizes. 
but getting people to talk about AOV would be like getting the US to
convert to the metric system (any remember 1975??)

Eric
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