That's fine. I understand the number will have meaning to those that wish to know it. Thanks for the example.
It's Friday so I'm working out my frustrations before the weekend. Tom C. >From: Godfrey DiGiorgi <[EMAIL PROTECTED]> >Reply-To: Pentax-Discuss Mail List <[email protected]> >To: Pentax-Discuss Mail List <[email protected]> >Subject: Re: AOVCalculator >Date: Fri, 31 Aug 2007 10:28:40 -0700 > >It might be important for understanding to see the numbers, Tom. > >Sometimes discussion or other activities moves in a theoretical way. >If you're using several cameras with different format film, sensor, >etc, you might want or need to see numerical values to visualize what >different focal lengths (that you do not have to work with ...) might >present in terms of field of view. > >For instance: considering wide angle lenses between the Panasonic L1 >and K10D, the DA14 and Olympus ZD 11-22 @11mm net very close to the >same diagonal field of view. However, I was curious to find that the >photos made with the L1 and the 11-22 looked "more wide angle", so I >did some calculations and compared: > >FL - H FoV - V FoV - D FoV - format >11mm - 78.6 - 63.1 - 91.3 - 4/3-System >14mm - 81.2 - 59.5 - 91.7 - Pentax DSLR > >In this instance, the 14mm on the Pentax shows a slightly wider FoV >diagonally and horizontally, but narrower vertically, than the 11mm >on the L1 shows. This made me curious as it seemed a little >contraindicative. > >However, I usually print to an 11x14" image area, which is much >closer to the L1's native 3:4 format proportion. I make that >adjustment to the K10D's format which nets a different set of numbers: > >14mm - 74.5 - 59.5 - 87.1 - Pentax DSLR cropped to 3:4 > >and now I could see that the 11mm lens on the L1 definitely produces >a wider field of view in all dimensions, nearly 5 degrees on the >diagonal. After thinking about this and looking at a bunch of >pictures, I came to the conclusion that, for me, wide angle views >feel wider to my eye when the format proportions are more square, and >the 11mm lens on the L1 produces a larger sense of space along with a >wider field of view. Now what I know makes sense. > >In other words, seeing the explicit numbers helped me to understand >then interpret what my gut feeling was. Whether that's important to >you or not I can't say, but I enjoy understanding stuff like this. > >Godfrey > > >On Aug 31, 2007, at 9:29 AM, Tom Cakalic wrote: > > > I suppose that it may be an interesting exercise for some. But > > really, > > after years and years of using a camera and the experience of looking > > through different focal length lenses, doesn't one sort of have a good > > approximate idea of what they're going to capture? The variability in > > shooting circumstances alone, proximity to subject, etc., makes the > > actual > > AOV number a little moot. I never think, 'you know lens A has an > > angle of > > view of X-degress, I think I'll use that one'. > > > > But if the actual number is important, OK. :-) > > > >> That's nice if you already own a particular focal length. > >> Sometimes, however, one might want to have an idea of FoV numerically > >> for other purposes. > > >-- >PDML Pentax-Discuss Mail List >[email protected] >http://pdml.net/mailman/listinfo/pdml_pdml.net -- PDML Pentax-Discuss Mail List [email protected] http://pdml.net/mailman/listinfo/pdml_pdml.net
