I agree with John Francis. Godfrey
On Jun 26, 2006, at 9:40 AM, John Francis wrote: > You're both wrong. It's either no darker (just cropped to a > smaller area) - so just as bright in illumination per equal > area (or equal solid angle submitted at the eye), or it's > 1/(1.5)^2 as much total illumination, which is a little over > one stop difference (it's like going from f/1.4 to f/2.1). > > > On Mon, Jun 26, 2006 at 01:14:10PM +0100, John Forbes wrote: >> Your maths is wrong. .33 darker. And as the viewfinders happen >> to be >> very good, I personally don't notice the difference. It's only >> like going >> from a 1.4 to a 1.7 lens. >> >> John >> >> On Mon, 26 Jun 2006 12:12:53 +0100, Martin Trautmann >> <[EMAIL PROTECTED]> wrote: >> >>> On 2006-06-23 15:21, John Francis wrote: >>>> All the Pentax DSLRs ar so-called APS-C sensors - around 24mm x >>>> 16mm. >>>> This means the field of view you get with any lens is the same >>>> as the >>>> field of view you get on a 35mm camera with a lens 1.5x the focal >>>> length. >>> >>> ... while the view finder is 1/1.5 darker!? (67%) -- PDML Pentax-Discuss Mail List [email protected] http://pdml.net/mailman/listinfo/pdml_pdml.net
