Hi All, Actually there is a further concern here. Although when a lens is stopped down to its max it does have the greatest depth of field, but it is also not at its sweet spot for sharpness. Usually a stop or two less than max provides the sharpest image the lens is capable of. Here is more about this:
http://www.bobatkins.com/photography/technical/diffraction.html Best, Martin On Wed, Jan 27, 2010 at 7:27 AM, John Gwilliam <j...@cox.net> wrote: > Al is right on this one. The higher the F-stop number, the greater the > depth of field is, i.e more of a three dimensional object will be in focus. > The drawback to this is less light enters the lens thus requiring a longer > shutter speed. And, if your not careful, a background that is too close can > be in focus as well. There are many different ways to take good quality > pictures of meteorites, experimentation is the key. > > Best, > > John Gwilliam > > At 06:50 AM 1/27/2010, al mitt wrote: >> >> Hi Erik and all, >> >> I'd think just the opposite would be correct. A higher f-stop (f 22, 18 >> etc.) would create a better depth of field and the more open your iris is on >> your camera (lower f stop, 1.8, 2.0 etc.) the less focused your items would >> be. I think you just stated it backwards. Best! >> >> --AL Mitterling >> Mitterling Meteorites >> >> ----- Original Message ----- From: "Erik Fisler" <erikfw...@msn.com> >> To: "meteorite-list" <meteorite-list@meteoritecentral.com> >> Sent: Tuesday, January 26, 2010 3:51 PM >> Subject: [meteorite-list] Meteorite Photography (Must read!) >> >> >> >> The third thing is auto-blending. For those of you who have SLR's you will >> notice that shooting at a higher F-stop like F1.8 or F2.8 is a lot sharper >> than shooting at a lower F-stop like F22. The problem is, you might have to >> drop your F-stop to make sure the whole meteorite is in focus. >> >> ______________________________________________ >> Visit the Archives at >> http://www.meteoritecentral.com/mailing-list-archives.html >> Meteorite-list mailing list >> Meteorite-list@meteoritecentral.com >> http://six.pairlist.net/mailman/listinfo/meteorite-list > > Regards, > > John Gwilliam > > Some people are born on third base > and go through life thinking they hit a triple. > [Bob Dylan] > ______________________________________________ > Visit the Archives at > http://www.meteoritecentral.com/mailing-list-archives.html > Meteorite-list mailing list > Meteorite-list@meteoritecentral.com > http://six.pairlist.net/mailman/listinfo/meteorite-list > ______________________________________________ Visit the Archives at http://www.meteoritecentral.com/mailing-list-archives.html Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list