Optical Limits tested the Laowa 100mm f/2.8 2X Ultra Macro and it did quite well for its price. The 100mm is very low distortion, but there is some vignetting at f/2.8 and it performs the best at f/5.6 where vignetting is no longer a problem.
“the Laowa 100mm f/2.8 2x Macro APO is capable of delivering very high-quality results straight from f/2.8. However, it has at least two advantages over your average 100mm macro lens – it can focus down to a magnification ratio of 2:1 and it has almost no bokeh fringing. The latter is quite an achievement actually. Lateral CAs are on a very moderate level and image distortions are low. The biggest weakness may be the amount of vignetting at f/2.8. Continuing on the positive side, we’d say that the bokeh is very pleasing overall…..if you can live without AF and appreciate the extreme macro capabilities as well as a moderate price tag, you should have a closer look. Highly recommended!”
You can read the full testing here.
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Laowa 100mm f/2.8 2X Ultra Macro APO:
VenusOptics / B&H Photo / Adorama / Amazon