Reply to thread

Message: <blockquote data-quote="TMG1961" data-source="post: 744534" data-attributes="member: 48766">I got the Tamron SP AF 70-300mm f/4.0-5.6 Di VC USD today and using it on a d7200 body.Got 2 questions.1. When back button focus is enabled and i push the button it does focus but doesn't keep the focus, it starts focus hunting when i want to push the shutter button. When using the shutter button to focus all works fine. When i use another lens it works fine.2. When i look at the exif info i see a focal length of 300 mm when completely zoomed in, shouldn't that be 450 mm when using a FF lens on a APS-C body?</blockquote>