I wasn't aware of that - the 'perfect circle' is a good reason.
Lensbabies use the magnetic ones, simple and clever.
I like the effect at f4.
Andrew Fildes
afildes@xxxxxxxxxxxxx
On 05/05/2009, at 7:10 PM, Moose wrote:
> Andrew Fildes wrote:
>> A friend uses a SIMA (and Lensbabies) - I thought it lacked a
>> diaphragm and had a wider aperture than that.
>>
>
> He has an incomplete one. The SIMA wide open is f2.0 and uses simple
> waterhouse stops mounted under a ring at the front for smaller
> apertures. Mine came with f4 and f5.6 stops and a neutral density
> filter
> in a little case. I suppose they use such stops not only because they
> are inexpensive, but for the perfect circles. Easy enough to make any
> stop one wants, including different shapes for effects.
>
> Simple samples showing the effects are here.
> <http://www.moosemystic.net/Gallery/tech/Lenses/SIMA/>
>
> If he is interested, I could easily scan them and he could cut out his
> own. They are just a thin, black, stiff paper/cardboard. Thin plastic
> would be more durable.
>
> Moose
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