The Oly zoom on the left at 12mm and the 12-60mm on the right. This is the corner that the 12-60 seemed to render better, although muddier than the others, but it fell away elsewhere.
Lenses that gave me pause
Panasonic 14-140 mk2. This is a little sleeper. It has the ideal 58mm filter size (have those), is small, well made and has a good range (12mm would have been nice). This was a case of more than adequate being trumped by better. If I had this, I would be settled, but at half the price of the 12-100 (the pro lens is on special at the moment), the temptation to go for better is too strong. It had a little CA that robbed it of some sharpness and the corners at 14mm wide open were the worst in it’s otherwise stable range.
Panasonic 12-60 f3.5-5.6. Much like the one above, but with a shorter range. Nothing to complain about, but a little expensive for the range/speed. I would have been tempted at a slightly lower price, pairing it with my 75-300. Compared to the lens below, this one looks to be very good value. Fixable but obvious green and purple CA with above average corners, especially in the aperture range I want, it gave the big Oly a run and matched or bettered the f2.8 zoom. The only issue, that I put down to the changing light was a lack of contrast, but after long comparison viewing with the others, it just looks to be a little flatter than the cooler rendering 12-100. It is also weather sealed and takes 58mm filters. Two other things I noticed. It was a tiny bit wider than the 12-100 at 12mm and it seemed to perform against reviews I later read. Possibly it suffers from some field flatness issues. These only effect testing flat targets not real life images.
Panasonic 12-35 f2.8 mk2. I must admit to being a little surprised by this one. I expected it to out shine the 12-100 if any would, but it was more at home in the lesser pack with the two above. The high speed and short range probably limited it an outsider and it would compete with my primes for general work. CA was well controlled mostly except for some troublesome purple/green at 35mm that I found hard to correct and it was consistently sharp across the frame. It is a strong lens in the vein of few faults rather than anything outstanding (much like the Oly 12-40). The 15mm became the reference lens and beat it at that focal length, but at 12mm it maybe pipped the 12-100 by a hair.
To put it simply, if I owned any of these above already, I would probably not bother to get anything else.
Not in the Mix
Olympus 14-150 Mk2. I really wanted this to be the winner as it fit the bulk of criteria and a big part of me hoped it would be a real sleeper like the 75-300, but alas it just fell behind the pack, especially on the outer half of the frame (similar performance to the 17mm). Maybe a good choice for general travel work and non critical landscapes, but it cannot in my opinion be elevated to the fine art level.
My reference lenses at the start of this test performed as expected.
The 45mm f1.8 Olympus is exceptional. It was the best at the edges, although only by a small margin to some of the other lenses at their best apertures and the 17mm performed above expectations on comparison. Those that were better in the corner of the frame than the 17 were clearly better (15mm, 12-100). I would put it’s corner performance in the middle of the pack and the centre circle was wide and forgiving, but the frame centre often beat the best lenses here (snappier micro contrast?).
The missing lens is the 12-40 Pro, a lens I grudgingly rate highly after using it for a while, but it has the same issues as the 12-35 Panasonic (short range) with added weight and filter thread needs. Owning this basically felt like owning a big and heavy 12-18, with the prime 25/45’s as good or better.
*
I will probably be getting (the tested) 12-100. It came through in the top two in every area. No mean feat considering the range. If I can noticeably better it’s performance at the focal lengths it offers, the lenses required would I feel, need to be the far less useful and no less expensive primes or paired f2.8 zooms and some of these I already have or have had and sold.
The 15mm is hard to let slip by, but I may revisit that later. Unfortunately for it, the stronger area for the 12-100 is in the 12-25mm range. They were really hard to split, with the 15 winning little fights, mainly in gentler, slightly smoother rendering (again micro contrast?), but the zoom looking crisper/more contrasty over all and again that huge advantage of being able to micro manage framing (and good macro) in camera, giving it the edge most often in resolution simply by avoiding wasted pixels later.
It is funny how the mind works. On one hand I would love to be that purist, who finds the rare piece of compositional perfection and draws from their understated bag one of a small, hand selected choice of (range limited) “ideal” lenses, then painstakingly composing the perfect image, accepting that sometimes the best framing option is not possible (adding the validation of good fortune to the good shots when captured). On the other hand, the realist in me just wants to get 100% return in any circumstances regardless without the false promise of better through hardship. Lets face it, good image making is hard enough, but which corners are worth cutting in the name of efficiency and which ones just promote laziness.
Fundamentally I am opposed to zoom lenses for my street and portrait photography due to their limited aperture range (especially in M43 where all apertures are practical to use). When thinking of landscape shooting, with it’s forced contemplation and effort, field craft limitations, unforgiving nature and other external considerations my thinking is different. Even issues such as handling/size/weight become irrelevant when methodical tripod use is the norm.
If the Panasonic 12-60 was cheaper, I would possibly look that way allowing this whole thing to be less expensive, but at twice the price you get nearly twice the range and slightly better performance across the board from the Oly.
An old favourite the 12-35 f2.8 failed to excite, being the perfect balance of not a useful enough range, and not outstanding (enough) performance to be compelling.
For a trip planned for next year requiring a lot of hiking, the Panasonic 14-140 is tempting, the Oly is not that big and heavy on balance.