Image drop in lens?

[tpuma]

The equipment is a Canon 80D body with a Tamron 18-200mm F3.5-6.3 lens. Sometimes while shooting, before the lens focuses the image seems to "drop" a little in the lens. I know it's not the best lens. But what could be causing this? Is it just a crappy lens? Can it be fixed? Is it damaged? I've only noticed this happen in auto focus and doesn't seem to effect the image quality.

 

[Braineack]

VC engaging.

 

[tpuma]

Thanks for the reply.
Is it normal for the VC to do that?

VC engaging.

 

[Braineack]

all stabilizations ive used make the image in the viewfinder "move" as they engage... this is also why they say not to use it on a tripod and fast shutter speeds; you'll capture this movement.

 

[tpuma]

Ok great thank you!

 

[Derrel]

Yes, VC or VR egaging, on some lenses, can do this image shift or image drop; it depends on the specific lens design, but my old 80-400 did that to a significant degree. It's normal behavior on some lenses, or in some types of image stabilization; not all image stabilkization systems or modes do this top the same degree. It is NOTHING to worry about though!

 

[Braineack]

and to be absolutely certain: turn of VC. what happens?

 

[tpuma]

Good thought. I'll try tonight.

and to be absolutely certain: turn of VC. what happens?