Thread: HELP! 70-300 af
View Single Post
  #5  
Old 28th May 2012
Ian's Avatar
Ian Ian is offline
Administrator
 
Join Date: Jul 2007
Location: Hemel Hempstead, Hertfordshire, UK
Posts: 11,340
Thanks: 412
Thanked 2,423 Times in 1,220 Posts
Likes: 816
Liked 1,627 Times in 723 Posts
Re: 70-300 af

Right - spotted a problem immediately in the EXIF data - you shot these at the smallest possible aperture (f/22). This means your images are significantly softened by diffraction (try to avoid going beyond f/22) and by reducing the brightness with such a small aperture your shutter speed is only 1/250th. That's good enough for 70mm, but at 300mm I'd be looking for at least 1/500th hand held with IS on and I'd be happier with 1/1000th or even faster if possible. By going back to ISO 100 or 200 you would be able to get more detail and dynamic range, a very acceptable shutter speed at f/8 and the whole image would be more crisp as diffraction softening would have been avoided. I'm pretty sure the shot is in focus, but the problems I have highlighted will have reduced image quality significantly

Ian
__________________
Founder and editor of:
Olympus UK E-System User Group (http://e-group.uk.net)
Four Thirds User (http://fourthirds-user.com)
Digital Photography Now (http://dpnow.com)
Olympus camera, lens, and accessory hire (http://e-group.uk.net/hire)

Twitter: www.twitter.com/ian_burley
Flickr: www.flickr.com/photos/dpnow/
Pinterest: www.pinterest.com/ianburley/
NEW: My personal BLOG ianburley.com
Reply With Quote