I found 5 of them on ebay by searching for "f=2m". They're all
Hasselblad bayonet mount of either 50 or 57mm. I think some Hasselblad
lenses have 60mm bayonet mounts but I didn't find any of those.
Some are very expensive but I found this B50 at a starting bid of USD 16
<http://www.ebay.com/itm/Hasselblad-Bayonet-50-Carl-Zeiss-Proxar-f-2m-Close-up-Lens-Made-in-Germany-/301946932085?hash=item464d708b75:g:1f0AAOSw1DtXHYd9>
and this B57 in the UK at a Buy it Now of GBP 15 + GBP 12.96 shipping.
<http://www.ebay.com/itm/Hasselblad-B57-Carl-Zeiss-Proxar-f-2m-Close-up-Lens-Keeper-/282030760087?hash=item41aa57e097:g:AKMAAOSwHnFVy2Lc>
There are readily available adapters to adapt threaded filters to Hassy
bayonet but I didn't find anything going the other direction. You could
probably glue it into a threaded step-up adapter. If the OD of a Hassy
B57 is actually 57mm it would be a nice fit into a xxmm->58mm step-up
ring... or step into your shop and machine something nicer.
And in the realm of achromatic close-up lenses don't forget about using
reversed lenses. A reversed 200mm lens makes a highly corrected +5
close-up lens. You attach the lenses together with what's called a
macro-coupling ring that has male filter threads on both sides. They're
readily available on ebay with most well under $10 including shipping.
<http://www.ebay.com/sch/i.html?_nkw=macro+coupling+adapter+ring&_in_kw=1&_ex_kw=&_sacat=0&_udlo=&_udhi=&_ftrt=901&_ftrv=1&_sabdlo=&_sabdhi=&_samilow=&_samihi=&_sadis=15&_stpos=29576&_sargn=-1%26saslc%3D1&_salic=1&_sop=12&_dmd=1&_ipg=50>
John Shaw discusses using coupled lenses in his book "Closeups in
Nature". He uses his 200mm prime coupled with either a 105mm
short-mount Nikon(?) lens or a 105mm enlarging lens. The 105mm lenses
thus become highly corrected 9.5X close-up lenses. A 50mm makes a +20.
Chuck Norcutt
On 5/8/2016 4:26 PM, Chris Trask wrote:
I thought as much. I wouldn't mind finding one of those +0.5 close-ups.
Tried years ago but they were scarce and expensive. It might be more suitable
to find a very short extension tube.
Chromatic aberration gets worse with glass curvature aka magnification.
A +1 isn't straining much of anything. The achromats become more
necessary as the magnification goes up.
Chuck Norcutt
On 5/6/2016 6:18 PM, Mike Gordon via olympus wrote:
There are several sites summarizing the achromatic diopters available.
I am slightly puzzled as to why they are not all that readily available
in lower powers.
I like this site:
http://www.ki.tng.de/~sgude/achromats.html
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