X-H2S/XF 70-300 Manual Focus Bouncing

[Don Barar]

Hi All:

I just received my X-H2S that I have paired with an XF 70-300.

Today, I attempted manual focus on a bird with the camera in aperture priority and the XF 70-300 zoomed out to 300 mm. Camera was set to manual focus and I carefully focused on the bird.  The bird was stationary.  Everything looked great.  When I reviewed the footage I noticed that bird occasionally bounced in and out of focus--the bird was close so this was not an atmospheric issue.  The lens did not slowly drift out of focus but moved out of focus and then back into focus.  I never noticed this behavior when the XF 70-300 was attached to my X-T3.

Has anyone come across this before?  If yes, what did you do to resolve.

Thank you in advance.

Don

[Don Barar]

I believe this to be operator error with a new camera.  Subsequent tests do no demonstrate this behavior.  Most likely I had the camera in continuous focus and that was what I was seeing.

Incidentally. Videos with bird detect against a clear blue sky continuous autofocus with bird detect works very well at both 60p and 120p.  However, put the bird in any complex background and bird detect autofocus works somewhat at 60p.  At 120p it works very poorly.

Don