I think he meant 0.5 diopter, not 0.5X. A 0.5 diopter lens has a focal
length of 2 meters which is quite a bit off from 0.4 meters or 2.5 diopters.
Chuck Norcutt
On 9/3/2011 8:00 PM, Moose wrote:
> On 9/3/2011 12:42 PM, Chris Trask wrote:
>
>> If you add a +1 closeup lens your maximum FL will be around 1m. Too
>> bad they don't make +0.5 closeups any more as they would be even
>> more convenient for photos such as this as you would have more
>> flexibility. Chris
>
> The standard OM C-U lenses are 40cm fl = 0.4x. Came in 49& 55 mm
> sizes.
> <http://omesif.moosemystic.net/om-sif/macrophotogroup/close-up_lenses.htm>
>
> I'm sure a request here would turn some up, and they are regularly
> available on the 'Bay.
>
> The iS/L Lens A-Macro H.Q. Converter f=40cm, 49mm thread, and
> B-Macro, 55mm thread, are achromatic (2 element) macro lenses
> optimized for - you guessed it - 135mm.
> <http://omesif.moosemystic.net/om-sif/is-series/is-series.htm#iS/L_Macro_Converters>
>
> Although Oly made them for the iS/L cameras, they are high quality,
> general purpose C-U lenses. Harder to find, though.
>
> Close Up Moose
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