> > From: Chris Stoddart <[EMAIL PROTECTED]> > Date: 2005/08/25 Thu AM 09:15:34 GMT > To: [email protected] > Subject: Re: Wideangle enablement :) > > > > On Wed, 24 Aug 2005, Steve Jolly wrote: > > > If you examine the filters carefully, you can see that they're slightly > > concave lenses rather than plain glass. (This is most obvious if you > > look at the reflection of a light source in them - you can see two > > images, one bigger than the other). I found the lens very soft (on > > film, at least), and have been wondering whether the filters are in fact > > an important part of the lens's optics. > > Steve, I don't think so. The filter being necessary is apparently not > mentioned in the manual, plus it's not on the optical diagram in the > manual. I've not done a proper test yet (I will, I will, I promise) so > I can't be certain, but most of the evidence points away. Also I can't > see any concavity/convexity on the filters and they don't seem to alter > the image when you look through them...
They don't need to have a curve on them to act as a lens. If a light ray is hitting them at an angle, it will be deflected by refraction. http://www.ps.missouri.edu/rickspage/refract/refraction.html Would make all the difference between a sharp and soft image. m > > Chris > > ----------------------------------------- Email sent from www.ntlworld.com Virus-checked using McAfee(R) Software Visit www.ntlworld.com/security for more information
