Cosina AF 100mm F3.5 MC macro A-mount lens review by Bob Maddison
|Bob Maddison#10806 date: Dec-28-2012|
flare control: 4
|ownership:||I own this lens|
|compared to:||Sony 30mm f2.8 Macro|
Minolta 50mm f1.7
Minolta 35-70mm f4 'macro'
|price paid:||100GBP (new)|
Excellent Macro lens
|comment:||I have the Vivitar version which I have owned for many years. |
Much criticised as the "plastic Fantastic" but the plastic construction is little different to the modern Sony lenses. Although AF is slow and noisy, this is an inherent property of a 100mm macro lens with external focusing.
The supplementary lens to take it to 1:1 has also been criticised. What this does is to shorten the effective FL thus reducing the amount of lens extension needed for 1:1 and it does seem to work with minimal effect on IQ. More importantly, by reducing the FL, it has the effect of minimising the loss of light often associated with a macro lens on full extension. I have estimated that the supplementary lens has a power of about 2.4 Dioptre. I have also found it useful to add an additional +1 to allow it to go a little beyond 1:1 as this makes it easier to attain true 1:1 for critical applications.
The fact that this is macro lens sometimes detract from the fact that it is a useful 100mm lens in its own right. Its relatively simple optics guarantee good colour and contrast, something that is missing from its more expensive cousins.
If this lens were available new today, the maker's would be laughing all the way to the bank! Understandably, it seems to be one of the most sought after lenses!