On 22 May 2012 20:31, David J Brooks <pentko...@gmail.com> wrote: > So, after i set the Sigma 300 f4 APO's focus point a few weekends ago, > i set out Saturday to shoot a few back yard birds and such. > > I did not have to review the photos in LR to tell which ones would be > in relative good focus and which ones could not focus. Its a hit a > miss but i'm now getting the odd shot like this: > http://www.flickr.com/photos/djbrooks/7252554432/in/photostream > Pretty much in focus, and then at times i get this: > http://www.flickr.com/photos/djbrooks/7252554372/in/photostream > Nothing will be in focus no matter how hard i try or use AF or MF. > > Not sure what going on, the lens worked very well with the istD and k-10d. > > Any thoughts?? > > > Dave
If it's not the SR going crazy Like P.J. suggested, then I'd say you have a loose lens element in the lens. That picture reminds me of a lens I partially took apart to clean the diaphragm blades, and then couldn't remember the correct sequence for the rear 3 elements. I tried various combinations, and the least crap one (though incorrect) produced photos like that. Cheers, —M. \/\/o/\/\ --> http://WorldOfMiserere.com http://EnticingTheLight.com A Quest for Photographic Enlightenment -- PDML Pentax-Discuss Mail List PDML@pdml.net http://pdml.net/mailman/listinfo/pdml_pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions.