Taken with:  Canon EOS Rebel t5 body and a Canon EF-S 55 ~ 250mm, IS, II Lens.

1/125s, F/5.6, ISO 200, Manual Priority Mode with Multi-Segment Metering.  F/L @123mm.

Thanks a bazillion for viewing.  Plse view large.  Thnx.  TT

Tonytee

As it turned out, the jumping focus point didn't actually affect the focus of the image. I had another issue that caused the focus to be soft. Actually the image is taken before the jumping occurs. I was told that the jumping is the focus point re-centering itself.

Very interesting.  That is one perspective I had not heard of or experienced.  It is possible for any gear to become damaged or knocked off kilter, given the 

endless possibilities with shipping, handling and even putting up with abuse to some degree.  The lens that I referenced earlier possessed an Auto-Focus System that was very accurate and very reliable, meaning consistent in its performance.  Not atypical of Nikon gear.

One of those things that make you go:  "Hhmmmm." 

Tony  

Pentax k-7 body with an SMC Takumar F 70~210mm lens.

1/125s, F/9, ISO 100, Manual Priority Mode With Multi-Segment Metering.  3EV and F/L @210mm.

Thanks very much for viewing.   Plse view large.  Thnx.  TT

Tony

Taken with;  Pentax K-7 body and an SMC Takumar F 70~210mm.

1/125s, F/6.3, ISO 100, Manual Priority Mode with CWA Metering and 3EV.

Thanks very much for viewing.    Plse view large.  Thnx.  TT

Tony