I have now been using the Zuiko 90mm macro lens for a couple of months and I am very pleased with it. In the past I have used the Nikon and Sigma 105mm lens, bellows, extension tubes and reversing rings with a 50mm lens.
Out of the lot I prefer this lens coupled with the Olympus OM-1, its a great combination. I first had the 60mm Zuiko lens but found I couldn't get on with it. The 90mm lens is easier to handle even though it is a larger lens, compared to the tiny 60mm lens.
So why this lens. First because it is on a micro 4/3 camera it works as a 180mm lens (FF comparison), this has many advantages as you can give the subject more breathing space. It is also a 2:1 reproduction rather than the 60mm 1:1 and has auto focus, which is a first for this size macro lens, normally at this reproduction you are always on manual focus. But because of its 2x crop factor on the OM-1 4/3 camera this really equates to a 4 magnification in 35mm terms.
Filling the frame is a dream, that is with a subject of about a third of an inch, compared to a more common 1:1 which only fills the frame with something approaching three quarter of an inch. Which is great for photographing small subjects.
The working distance is not just about the subject feeling at ease but also making it easier to light. It was always a nightmare trying to light something with the bellows as the end of the lens was virtually touching the subject.
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