Thanks! --- Rob Studdert <[EMAIL PROTECTED]> wrote:
> 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 > >
