On 28 Jan 2003 05:29:16 -0800, puffmoike@yahoo.com.au (Michael) wrote:

>My old Tamron 28-200 definitely wasn't parfocal.

>

>I've read that the Tamron SP 24-135 is.

>

>Having a look through old posts it appears that even some fine Nikon

>lenses (such as the 80-200 f2.8) aren't. It's not something typically

>listed in the manufacturers' specifications.

>

>Does anyone know where there is a list of Nikon (or other brand)

>lenses which includes in the specifications whether the lens is a

>parfocal or varifocal?

>

>As a rule what types of lenses are likely to be parfocal (expensive,

>small zoom range, recent designs, etc)?

In the Nikkor line, all zooms are intended to be

parfocal, but in practice, many samples are slightly

varifocal (which made the advice in the instruction

booklet to zoom long, then reframe for best focus,

poor advice...;-). Most current zooms are intended to

be parfocal...