On 11-09-13 2:51 PM, Larry Colen wrote:
for some reason in low light even my K-5 has a really tough time focusing the Sigma 20/1.8. Which is annoying because I got it because I needed a fast/wide lens for low light.
I believe this is a generic focusing issue, ie not limited to Pentax. Somebody else (don't recall who, sorry!) mentioned in the last week that wide angled lenses are difficult to focus because the contrast changes so little there's almost no information for the AF system to chew on.
OTOH, wide angles also give you deeper DoF, so you win some you lose some. -bmw -- PDML Pentax-Discuss Mail List [email protected] http://pdml.net/mailman/listinfo/pdml_pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions.
