I have seen very little or no discussion of this lens combination on this forum, but it does come in a micro 4/3 mount, so I will take the plunge and talk about my experience with it. I debated whether this should go in the native lens section or the Adapted lens section, but the Adapted Lens section seems most appropriate. The Composer Pro into which the optic is installed has a micro 4/3 mount, but it is essentially a type of adapter or lens housing rather than a lens. The optic itself can be used with many types of cameras/mounts. I borrowed this lens from a friend because I’d been wondering about it after seeing some shots taken with it that really captivated me. I wasn’t sure if the micro 4/3 version would give the same blur as it would on a FF camera, given the smaller sensor and DOF differences, and there are definitely differences. I have been putting it through its paces for the past few months, and ultimately decided that this lens suits my shooting style and subject matter, so I ended up buying it. The Lensbaby series of lenses and optics are odd ducks. The combination I tried and later purchased (Lensbaby Composer Pro with Sweet 50 Optic) is not especially expensive as far as lenses go ($300 USD new for both Composer Pro and the Optic, $120 for the optic by itself). The Composer Pro component into which the lens/optic is installed feels pretty cheap, like (for example) the plastic Oly 40-150mm kit lens, but the optic itself is more substantial. It is manual focus only, and aperture is controlled on the optic with an aperture ring. There is most definitely a learning curve, and it is not going to appeal to everyone. [UPDATE: Since I first posted my review, Lensbaby has released a Composer Pro II which is metal, rather than plastic] The Lensbaby is a special effect lens, and it may seem at first like a one trick pony. it has a sweet spot of focus which you can move around the frame by tilting the composer Pro on its ball joint in any direction. You can tighten the Composer Pro to lock it in a specific position or loosen it so the ball rotates more freely. Everything outside the sweet spot of focus gets intentionally stretched and distorted, creating an interesting radial blur. It does very interesting things with lines and with bokeh. The more you move the sweet spot off center, the greater the distortion, though if you go too far you may get nothing at all in focus. The mostly plastic Composer Pro is the part that gets mounted to your camera (it comes in micro 4/3 mount - and 4/3 mount, so make sure you get the right one if you buy!) and then you can use any of the compatible Lensbaby Optics with it. The one I have been using is the sweet 50 optic which falls in my favored short telephoto range. With micro 4/3, you get the most noticeable Lensbaby effect when using it wide open, whereas on full frame, very little would be in focus wide open at 2.5. It’s somewhat less versatile on micro 4/3 since you definitely don’t get as much blur vs. FF at wide apertures BUT on the positive side it is much easier (though still not easy) to nail the focus on m 4/3 due to the greater DOF, and it’s easier to use at wide apertures. Here are some wide open example shots, most from a bit of a distance: Burst of Spring Color Final Snow? Standing Tall It is up close that this lens gets really interesting, in my opinion, and where the effect becomes much more difficult to replicate with something like a radial blur filter. The minimum focus distance is relatively close (15”), and you start to see some dreamy, ethereal effects near minimum focus distance. The out of focus areas often take on a painterly quality. Lines and curves toward the edges of the frame get stretched, smudged, and/or blurred and can sometimes convey a sense of movement. For example, these were taken wide open near minimum focus distance: Dance of the Alliums Fritellaria Blue Spires Spiraea Cloud Hidden Bud Tulip Swirl The dreamy effects get more interesting when you get even closer. I added a Raynox 150 macro adaptor which I already owned, attached to the front of the Sweet 50 optic with a 46-43mm step down ring. This is a much better solution than Lensbaby’s own macro kit, which requires removing the optic. You also could use extension tubes. At this close distance you really get some interesting blur and bokeh, and the subjects often acquire a certain glow. I still like to use the lens wide open or close to wide open (f/2.5 to f/4) even though I would not do that with the Oly 60 macro at such close range, and the results can be really interesting and abstract. FYI I used only natural light on all the examples below. Fading Away First Columbine Frost on Pulsatilla Love-in-a-mist Not Forgotten Pulsatilla Glows Grand Opening Peony Abstract It takes practice to be able to predict what the Lensbaby will do with the lines in an image, and what type of blur and bokeh will result based on what is in the background, how close background elements are to the sweet spot, and how much you have tilted the Composer Pro. I still get surprised a lot when I see the results in Lightroom, often pleasantly surprised. I miss focus more with the Lensbaby/Raynox combination than with the Oly 60 for macro work, however, in no small part due to the manual focus and the fact that shooting wide open or close to it increases the chance of missed focus. I work with flowers and plants, and for that subject matter, the Lensbaby creates intriguing effects with branches, stems, petals and other flower parts. I have seen some really interesting portraits created with it, too, but I’ve not tried that yet. Whereas in “normal” shooting I try to isolate a subject from its background using distance or an angle that provides a more simplified backdrop, with the Lensbaby what would normally be distracting ‘busy” bokeh often turns into something more interesting. It doesn’t always work, but when it does, it’s something special. Who might like this lens? Weird bokeh addicts Those who like a painterly look Those who really like how a radial blur effect isolates a subject Those who like to look at subjects in a different way Those who like to take time to experiment Who probably will not like it? Those who don’t like manual focus lenses Those who have poor vision or shaky hands (which make it harder to nail the focus) Those who get frustrated by lenses with a learning curve Those who don't like cheap feeling lenses Those who prefer technically perfect lenses Those who want sharpness throughout the frame Pixel peepers Some links: Lensbaby Composer Pro with Sweet 50 Optic: Composer Pro with Sweet 50 Optic | Creative Effect Camera Lenses | Lensbaby [UPDATE: There is now a Composer Pro II, which is metal rather than plastic: http://lensbaby.com/product/composer-pro-ii-with-sweet-50-optic/] Lensbaby photo pools on Flickr: Lensbabies Flickr Lensbaby Group NOTE: These Lensbaby photo pools include shots taken with other Lensbaby optics, some of which have very different characteristics, as well as shots taken with full frame cameras that can achieve more significant blur than you will get on m 4/3 Well, that’s my review! Let me know if you have any questions.