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On distant subjects, I actually found that the OM System 90mm f/3.5 Macro IS PRO outperformed my old M.Zuiko 60mm f/2.8 macro in focus speed, especially in brighter conditions. However, at close focusing distances, the 60mm lens was faster – probably because it didn’t need to examine the whole range from 2:1 to wider magnifications. Thousands great macro shots of insects done with shorter focal lengths somehow show that 180mm is not needed.
The OM System 90mm f3.5 Macro IS Pro proves that the Micro Four Thirds system still has clout in an era of full-frame mirrorless. This macro lens does what a full-frame camera can’t do — use autofocus at a 4x equivalent macro. The 90mm is the kind of landmark lens that may even be big enough to sway some photographers over to the Micro Four Thirds system. If you indeed believe in what you said, regarding objective and unbiased views, you would be able to apply this to longer focals lengths and understand that whilst a preference, there may indeed be benefit and applications for such a lens. from Gaussian formula, the half angle of entrance cone is solely dependent on magnification and aperture, so basically, for a given magnification, it is the aperture that matters to increase resolving power, ie, reduce diffraction, that also means, for a given magnification and aperture, it does not matter what focal length the lens has, in turn again, that means if both has same nominal aperture, set at same magnification, both will have same resolving power. Perhaps the biggest threat to sharpness is the natural movement of the subject, which is bound to happen with outdoors subjects. Even a millimetre shift in a breeze can be a threat to perfect sharpness at this close proximity, so you might find you want to try shooting at faster shutter speeds and upping the ISO as a compromise.A lens of this kind reveals the kind of details that are extremely difficult to see with the naked eye, so of course it needs to be as sharp as possible. All in all, I was extremely impressed by the OM System 90mm f/3.5 Macro in terms of sharpness. It wasn’t just in this test above – in every photo that I took with the lens, regardless of focusing distance and aperture, it was sharp from corner to corner. Bokeh Even with those limits, at 4x macro, there’s still only a very small slice of the image in focus. This lens will break a fancy depth-of-field calculator because it’s too small to measure in hundredths of a meter. The margin for error is essentially non-existent at the closest focusing distance and f8. I was initially worried about that aperture limitation, but became less bothered when actually using this lens because the depth of field is so narrow. The focus distance limiter switch has three options; regular focusing, macro, and ‘S Macro’. To obtain that 2x magnification, you’ll need to be in the S Macro setting regardless if you are focusing manually or using autofocus.
Although there are a few other macro lenses available for Micro Four Thirds shooters both from Panasonic and OM System, none of them are true competitors to the 90mm f/3.5 Macro. After all, none of them focus to 2x magnification, and the 90mm focal length is also unique. This lens is clearly the flagship macro lens for Micro Four Thirds today. Hubertus Bigend - I quote from the LensTip review "At the maximum relative aperture it exceeds distinclty 60 lpmm and produce very sharp, crisp images; on stopping down to f/5.6 it started to brush against 80 lpmm." Maximum image magnification 2x1, 4x2 when paired with the optional MC-20 2x teleconverter, delivering flexibility for even the most extreme macro adventures
OM System M.Zuiko ED 90mm F3.5 Features
In particular, here are what my autofocus speed tests showed. I tested the focusing speed of both lenses from 1x to 0.5x magnification. After 10 replications with each test, the OM System 90mm f/3.5 Macro IS PRO grabbed focus in 5.8 seconds on average, while the 60mm f/2.8 grabbed focus in 5.2 seconds on average. (I also wonder if a newer copy of the 60mm would be even faster, since as I’ve said, mine has seen some things.) What's clear is that it depends on the lens. It's widely agreed that the 2x TC is less-than-impressive with the 40-150mm Pro. Also what Hubertus said about the Pany 50-200 is true while the Pany 2x TC works well with the Leica 200mm. M. Zuiko Digital ED 90mm F3.5 Macro IS PRO: the ultimate field macro lens for the seasoned professional and macro curious alike; a class-leading lens built by OM SYSTEM to provide an incredible outdoor macro photography experience. Maximum image magnification 2x, 4x when paired with the optional MC-20 2x teleconverter, delivering flexibility for even the most extreme macro adventures Seems you still don't quite get the concept. If the 5MP image contains all the detail that is resolvable than it doesn't matter if you throw 20MP at it. The 20MP result will look the same
Optically, I haven’t experienced any significant weaknesses on the 90mm f/3.5 Macro. The sharpness is breathtaking, even compared to the M.Zuiko 60mm f/2.8 Macro that has always been my sharpest lens. Not to mention that the working distance of this lens is comfortable, and the image stabilization works as it should. In addition, I don't understand your reasoning on its value for pushing down an objective. As you know, the FOV of an objective on MFT with a 90mm tube lens is about the same as the FOV of the same objective on a 180mm tube lens on FF. This is very close to the the FOV you get with the same objective and a 200mm tube lens on FF. In other words, this new 90mm lens, if it does not vignette, almost exactly replaces the 200mm + FF system. That's very useful. And it hardly counts as pushing down, in terms of lines per FOV. Lns per mm is not the appropriate measure when comparing across sensor sizes. This is one of the sharpest lenses I’ve ever used. I was capturing details I never knew existed on animals I have photographed countless times for years. Even after cropping my images significantly, the details remained clear. In fact, the lens is sharp enough that the OM-1’s 20 megapixel resolution was the limiting factor for sharpness, rather than the glass. Rated IP53 against dust and moisture, the OM Digital 90mm macro should also be supremely well protected from the elements, potentially making it a fantastic option for close-up photographers working in the field. Insect and nature photographers in particular might benefit from its tough-built, image-stabilized design. When can I buy an OM Digital’s new lens & what will it cost? That said, at image magnifications significantly beyond 1x (in 35mm terms), resolution generally becomes more and more of an issue due to diffraction.You can increase the magnification even further by pairing the lens with either the 1.4x or 2x converter, which boosts magnification to 1.41x/2.83x and 2x/4x respectively. It’s worth noting at this point that at its closest focusing point, the older M.Zuiko 60mm f/2.8 Macro lens boasts only 0.5x magnification. Sometimes I really like the perspective wider macro lenses can produce. For example, the Panasonic 9mm f/1.7 does a surprisingly good job as an almost-macro lens. Super tiny MFD, but really intimate perspectives I prefer over longer focal lengths. When thinking about using this new lens a few things come to mind regarding the focal length and the working distance.
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