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The following opinions have been automatically translated with Google Translate.
Cons:compatible with a few optics (but this is more a "against" of optics rather than the multiplier!); qualitatively, none
Opinion:In the past I have used other multipliers (Kenko on FF Canon and still I sometimes use the 1.4x plus 100mm f/2.8 macro on 5D II), but the quality of this little one has left me speechless: associated with the Olympus 40-150mm f/2.8 PRO is really amazing, if you do not look at the exifs, it is practically impossible to understand by the image quality alone if the photo was taken with or without multiplier (and those who know the 40-150 know well what exceptional optical quality you are talking about). What to say: with one and a half years allows you to have a canvas twice as long without loss of optical quality! OBVIOUSLY, doubling the focus, halves the brightness (f/5.6 fixed), but this is physical, not a demerit of any lens. If you really want to frame the subject in the extreme corner of the frame (but who wants to do it?!), it could be useful to close half a stop, but otherwise, even at TA the image quality remains absolute. I've never tried it with the 300mm f/4, but they tell me that the yield is absolutely similarly excellent as on the 40-150. At my own feeling, the AF (on E-M1 mark I, I imagine that on the next one goes even better) remains very responsive, maybe a hair hair slower, but it's hard to understand it. Rating 10 and absolutely recommended purchase for those who want to get to mm "serious" without fainting and/or get a hernia!
Cons:Especially with long focals it loses a bit in sharpness, but closing 1 or 2 stops improves a lot
Opinion:Combined with the 40-150 f2.8 allows you to double the focus, at the cost of losing 2 stops (inevitable) and losing some sharpness, especially at the corners, but it recovers a lot closing by 1 or 2 stops. In the center obviously changes less, and 1 closing stop is enough to recover the detail. Considering the alternatives (the 300 mm f4.0 does not come cheap and, as far as I'm concerned, I would use it too little) is a great choice: use the 40-150 up to 150, and mount the multiplier if you have to go further. The multiplier from 1.4 is crisp and of course bright, but multiplies less.... As is often the case, in photography it is a matter of compromises p.s.: the pair 40-150-multiplier x2.0 is clearly sharp compared to the 75-300 p.p.s.: it requires updating the firmware of the machine, however linear and simple. Also supported by older models (EM5)
Pros:Double the focal length that in birdlife is no small
Cons:As personal opinion
Opinion:Used with the 40-150 f/2.8 Pro is very manageable even as sharpness is on par with the tc 1.4 you can take photos even with a little long time, while applied to the 300 f/4 things change a little to use with favorable lights with times not less than 1/200 otherwise consi The use of a single foot or an easel because you lose two stabilization stops for here to use a 1200mm freehand is a bit of a difficult thing. While also on the detail from the few photos I made you lose something compared to the tc 1.4 but remediable in post production. At the moment I recommend it but to use with the necessary precautions