----- Original Message ----- From: "Steve Jolly" Subject: Re: *ist-D and the wide angle lens dilmena
> It was in the 21st Feb issue of "Amateur Photographer" (UK), so I'm > afraid there isn't a link to give you. > > They printed MTF graphs for five different focal lengths. At 12mm, the > "resolution" (if you define it as the number of lppm that the lens can > resolve with a contrast of 0.5) was 27 lppm wide-open, and 30 lppm > closed down two stops. > > From the text of the review: "Corner-of-frame sharpness at 12mm and > full aperture (f4.5) is good on subject main features, with fine detail > improving at three stops down to a very high standard." For some reason, people seem to think that a really wide angle lens should be (can be) as sharp as a normal or short telephoto macro lens. Thsi ain't the case, however, and the longer the lens flange to focal plane distance is, the harder it is to get a good design. If the Stigma is half assed good at 12mm, then they have done well. William Robb
