I've been wanting to play around with other macro options besides the macro mode on my O12-50 for a while. Mostly, I wanted something with a longer working distance for insects, and preferably portable (so no bellows). Didn't really want to carry another lens just for infrequent macro, so ruled out the otherwise excellent O60. Secretly, I also wanted a portable macro solution so I could replace the O12-50 down the line... Enter the O40-150! I very quickly found the subject isolation the telephoto gives for larger flowers to be excellent. Unfortunately, magnification ratio was lacking compared to the O12-50 (0.16x versus 0.37x). And so started the exercise of extending the magnification ratio of the 40-150... Firstly, I couldn't find any extension tubes that allowed aperture and AF control where I live, and high quality achromatic lenses from the likes of Marumi where hundreds of dollars mail order. I wasn't sure what dioptre was required so wasn't prepared to shell out without trying. A couple of months back, I found a bargain $15 item - Sigma Achromatic Macro Lens, +1.6 dioptre. Here it is mounted on the 40-150: That was neat, but in practice it gained only just under 0.3x magnification, not enough to justify using it over the O12-50 just yet. Well, last week I found another bargain item for $50 - Sony AC Close-Up Lens VCL-M3358, +3.3 dioptre. Here it is stacked with the Sigma +1.6: Well, I'm pleased to report that I've now found my solution. Both the +3.3 by itself and the +3.3 +1.6 (+4.9) stacked work very well. Sharpness is decent enough (on par with the O12-50 at least), no chromatic aberrations that I can see, as expected from dual-element coated achromatic lenses, but contrast is a bit on the low side (the 40-150 was already a tad bit low anyway), the test shots below all have contrast boosted in post. The achievable magnification ratios are now pretty impressive, with +3.3 it's something like 0.5x and with +4.9 it's about 0.7x. In 35mm terms that's approximately 1x and 1.5x magnification! A test shot @f5.6, DoF is ridiculously thin: And @f22: Real world hand-held examples with +3.3, 1/500s, f/16, minimal cropping. I don't do flash so auto-ISO is going pretty high to allow enough shutter speed to keep up with these critters. DoF is ridiculously thin, and AF is only useful for fine tuning - initial focus must be obtained by moving the camera. And one with +4.9: Edit: Finally figured out the dioptre equations, they make the magnification figures make more sense. Not quite as high as I originally thought, but the m4/3 2x enlargement factor makes up for it somewhat.