Even though we ARE Nikon lovers,we are NOT affiliated with Nikon Corp. in any way.

English German French

Sign up Login
Home Forums Articles Galleries Recent Photos Contest Help Search News Workshops Shop Upgrade Membership Recommended
All members Wiki Contests Vouchers Apps Newsletter THE NIKONIAN™ Magazines Podcasts Fundraising

70-300mm VR + Kenko Pro 300 1.4: Severe Back focus at 300mm


Redondo Beach, US
12 posts

Click to send email to this author Click to send private message to this author
SamD_2009 Registered since 02nd Feb 2009
Thu 18-Jun-09 05:07 PM | edited Thu 18-Jun-09 10:37 PM by SamD_2009

Just yesterday discovered that my 70-300mm VR with Kenko 1.4X Pro 300 backfocuses a lot at 300mm. I immediately applied AF tune up to limit -20. By the way, a very nice feature discovered: Lens+ TC shows up in a list of saved lenses as a new lens 70-300X1.4.
Well, -20 improved focus a lot, close but no cigar. Need something about -25 or -30.
Interesting that at 200mm back focus is not so big and I can compensate it but 300 mm is a real nuisance.
Can anyone advise a service that can adjust Kenko 1.4X?

Edit: Forgot to add that manual focusing works perfectly... if I'm getting lucky to focus accuratley at this length.
Also: 70-300mm VR without TC autofocuses pretty well, no need for tuning.