Morning all,

I was toying with an alternative design which I haven't got round to yet.

So in focusing a stills prime, you are simply moving the lens closer
or further from the imaging (film) plane. In a conventional prime
this is acheived by rotating the barrel and the inner working of
the lens take care of the movement.
In certain instances, e.g. macro
photography, it can be done by putting the lens on a set of macro
bellows and spinning the thumb-screw to move the extension mechanism forward and back.
This sounds strikingly similar to a follow focus without the requirement for
gearboxes or lens gears, with the added benefit of easily changeable lenses.

Of course, a vibrating/rotating mechanism would have to be incorporated
and play minimised from the extension movement.

Anyone done this yet?


I haven't finished my basic one yet so I'll get that done first!

cheers,

Dave

Also,

This could open up a world of really quick lens opportunities in that lenses with no focusing/aperture control could be used.

cheers

Dave