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Manual APO lens for macro 4:1 and above: Recommendation?
#1
Just played around with older equipment with my 7D: Soligor bellows M42 + Chinon 24/2.5 M42 in retro position + EF-M42-adapter with AF confirm.

I'm planning to go for insect eggs this year and the magnification of this combination looks promising: 4:1 to about 8:1. DOF is almost non-existing of course. But bokeh CA (lateral CA) of this lens is very disappointing, stopping down to f/5.6 doesn't help.



Do you have a recommendation for an "affordable" manual apochromatic lens with focal length 24-50 mm? Mount doesn't matter that much, doesn't have to be a very fast lens, f/4 will do.* Affordable means: lower 3-digits in Euro.



My knowledge about old-fashioned lenses may be described as "non-existing". If I'm delusional about the price range, just drop a word.



Ciao, Walter



*EDIT: Field curvature isn't a big thing either. Focus stacking will be used.
#2
Apo-Rodagon 50/2.8 or the newer version Apo-Rodagon-N.

[url="http://www.rodenstock-photo.com/mediabase/original/e_Rodenstock_Printing_CCD_43-62__8230.pdf"]http://www.rodenstock-photo.com/mediabase/original/e_Rodenstock_Printing_CCD_43-62__8230.pdf[/url]

Maybe any mid-tier 50 mm enlarger lens (Rodagon, Componon, EL-Nikkor) would be already good enough.

Do you know [url="http://www.zoerk.com/"]http://www.zoerk.com/[/url] ?



-- Ralf
#3
Real apochromatic lenses in the 24-50mm range? And then "affordable"? Do those exist?



Apparently I have two lenses which are good in certain aspects for your described usage... the ultra micro NIKKOR 55mm f2 (designed for 4:1 usage) and the ultra micro NIKKOR 28mm f1.8 (designed for 10:1 usage). But those specialized lenses nowadays do a few 1000 euros or dollars a piece, hardly affordable.



I am not an expert in any sense, concerning macro photography... But I think you best bets will be to look for lenses which just are good CA and coma wise, and look what other "ultra" macro photographers use, besides the Canon MP-E.
#4
Most 50s should be decent with respect to lateral CAs.

Just check out the manual focus macro lenses (Canon FD, Olympus OM, Minolta MD) - they are pretty cheap and should be good.
#5
Thanks to all for your advice!



Ciao, Walter
#6
[quote name='Walter Schulz' timestamp='1331467471' post='16550']

But bokeh CA (lateral CA) of this lens is very disappointing, stopping down to f/5.6 doesn't help.[/quote]

Which CA were your worried about? I assumed lateral CA was written in error as bokeh CA and looking for an APO lens seemed to go together. Unfortunately I don't have any suggestions...
<a class="bbc_url" href="http://snowporing.deviantart.com/">dA</a> Canon 7D2, 7D, 5D2, 600D, 450D, 300D IR modified, 1D, EF-S 10-18, 15-85, EF 35/2, 85/1.8, 135/2, 70-300L, 100-400L, MP-E65, Zeiss 2/50, Sigma 150 macro, 120-300/2.8, Samyang 8mm fisheye, Olympus E-P1, Panasonic 20/1.7, Sony HX9V, Fuji X100.
#7
Schneider Apo-Componon HM 4/45mm in reversed position could be the solution.
#8
Another option are loupe macro lenses with microscope lens thread, which are built for the magnification range you mentioned and which are also available in rather short focal lengths 12.5-50 mm. I'd say these are no apochromats though. At least I would guess that from the absence of the "Apo" tag in the lens designations. I know that microscope lens manufacturers (Leitz, Zeiss, Olympus, Wild) never fail to emphasize that a lens has that type of aberration correction. I have no idea about the optical performance of this lens type.



[url="http://de.wikipedia.org/wiki/Lupenobjektiv"]http://de.wikipedia.org/wiki/Lupenobjektiv[/url]

[url="http://www.macrolenses.de/start.php?lang=en"]http://www.macrolenses.de/start.php?lang=en[/url] via [url="http://de.wikipedia.org/wiki/RMS-Gewinde"]http://de.wikipedia.org/wiki/RMS-Gewinde[/url]



[url="http://www.ebay.de/itm/RMS-Thread-to-M42-Adapter-for-Zeiss-Luminar-Bellows-/140718400195?pt=LH_DefaultDomain_0&hash=item20c37862c3#ht_890wt_957"]RMS to M42x1 adapter[/url]

[url="http://www.ebay.de/itm/Photar-1-2-5-25-Leitz-Wetzlar-Balgengerat-Kilfitt-Naba-/170803115669?pt=DE_Foto_Camcorder_Objektive&hash=item27c4a8b695#ht_500wt_972"]Leitz Photar 25/2.5[/url]

[url="http://www.ebay.de/itm/Leitz-Photar-1-2-5-25-/160761980853?pt=LH_DefaultDomain_77&hash=item256e2927b5#ht_601wt_1132"]Leitz Photar 25/2.5[/url]

[url="http://www.ebay.de/itm/Canon-Lupenobjektiv-3-5-20mm-/180833151081?pt=DE_Foto_Camcorder_Objektive&hash=item2a1a7ee869#ht_500wt_738"]Canon 20/3.5[/url]
  


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