Well this is only half a Pentax lens, Rear Converter-A 2X-S. The other half of the lens is an old medium price Bushnell screw mount 200mm tele. The combination shows chromatic aberration / blooming wide open. I've added some 100% crops to show how the nasties can be cured.
http://members.shaw.ca/hargravep/Image1.htm Powell At 07:44 AM 21/02/2005 , Shel wrote: > >There have been some comments on the list to the effect that some manual >focus Pentax lenses don't produce very good results when used with the >istD(s). A little more information is needed. Which lenses are giving >poor results? In what way are the results poor? When using a particular >lens, are the problems only in certain circumstances, or across the board. >I've seen some awful looking results with some longer lenses (Paul's bird >shots), but they seemed to be relegated to backlit scenes. So, any >comments on the quality of images with various manual lenses would be >appreciated. Reasonably sized pics (sections of larger images) might be >helpful as well.
