Luminous Landscape Forum

Equipment & Techniques => Cameras, Lenses and Shooting gear => Topic started by: JJP on January 02, 2006, 09:51:22 am

Title: manual focus of lenses
Post by: JJP on January 02, 2006, 09:51:22 am

Good Day Folks,
The lenses that I got which are some Canon, some Sigma, and a Tamron for the most part behave this way:  In manual focus, when taking a landscape with the main subject being in the background (miles away) I always assume that all's I got to do is turn the focus ring to infinity and fire away.  However, how come I always got to turn the focus ring back some to get the aforementioned background in focus? Is this a manufacturers defect or is this the norm?  
jules

Title: manual focus of lenses
Post by: joedevico on January 02, 2006, 10:49:53 am

JJP -

See the topic below about infinity focus started by pom - it has to do with expansion/contraction due to temperature...