On 20 Mar 2006 at 8:22, John Bailey wrote: > How well do the lenses perform on the sensor compared > to film as far as CA effects and/or pixel blooming? I > made some DS2 exposures with my 1.4x tx + 300/8 > vivitar this last Saturday of herons nesting in > Sycamore trees in the Cuyahoga Vally National Park in > NE Ohio. The lcd review showed alot of purple along > the tree branches against the light blue sky. At home > on my monitor there wasn't as much. The files were > PEF, then viewed both with Irfanview and Pentax Photo > Lab. When converted to jpegs most of the purple is > gone except the thinnest branches are purple.
When post-viewing in camera you are looking at a low quality jpg file which is affected by the in-camera settings, the RAW transformation used to produce this image isn't as sophisticated as most of the external RAW convertors and can exaggerate bloom and CA issues. I find that if I reduce sharpening to the bear minimum at the time of RAW conversion (using ACR) any bloom becomes far less saturated and obvious, compensating for CA in the RAW convertor can help a great deal too. Cheers, Rob Studdert HURSTVILLE AUSTRALIA Tel +61-2-9554-4110 UTC(GMT) +10 Hours [EMAIL PROTECTED] http://members.ozemail.com.au/~distudio/publications/ Pentax user since 1986, PDMLer since 1998
