What's really neat about the design on the 3.6 is that, if you have the
proper lens hood mounted, it automatically adjusts for changing focal
length. Just think about it !
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~`
HI100@xxxxxxx wrote:
>
> tscales@xxxxxxxxxxxxx writes:
>
> << The f/4 and f/3.6 are great, but bigger, heavier and usually more
> expensive. >>
>
> I dislike zooms in general but I recently bought the ("360 ball bearing")
> f/3.6 and would point out an interesting characteristic. As the zoom focal
> length increases the zoom gets substantially shorter. Without thinking about
> it too deeply one might guess that the lens would get longer as the focal
> length increases. I checked a Vivitar series 1, 28-90mm f2.8 varifocal zoom
> and sure enough the zoom gets longer at maximum zoom. The OM 75-150 f4 on the
> other hand stays the same length as it is zoomed. Another characteristic of
> the f/3.6 is that even at maximum aperture setting the diaphragm stops down
> slightly during exposure so DOF will change slightly. I have not checked how
> this is affected by focal length setting but this is probably just related to
> keeping the max f/stop constant and I think this has been discussed on list
> previously.
> I don't know how the other zooms in this class vary in length, with
> focal length setting but would be interested to hear.
>
> Tim Hughes
> >>Hi100@xxxxxxx<<
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