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I was really looking forward to shooting the Voigtländer Nokton 50mm f/1.2 VM on the Z 6. But once I had mounted it via the Voigtländer M to Z mount helicoid adapter, the whole combo felt really dense and surprisingly heavy. Of course, it's not really that exceptionally bulky - it just felt almost uncomfortably front heavy. This compelled me to put its cousin, the Nokton 58mm f/1.4 SL II-S, on the D750, and lo and behold, the two combos weigh virtually the same (within a couple of grams), with the DSLR combo feeling way better balanced. With the adapted lens, I felt the strain on the wrist after only a couple of minutes of carrying it in the hand - something that doesn't often happen with the Z bodies at all.
Of course, optically, the 50mm f/1.2 is way better than the 58mm f/1.4, and the Z 6 combo offers (3-axis) I.B.I.S. still. But my enthusiasm has been quenched quite a bit. This only goes to show: There's more to lens design than just optics and size: Balance is really important on the whole. I remember not liking the feel of the Z 24-70mm f/4 S on the Z 6 much - whereas both the bigger Z 24-120mm f/4 S and the mighty Z 24-70mm f/2.8 S feel quite nicely balanced. Even the huge Z 50mm f/1.2 S (which blows the Voigtländer out of the water, optically) feels bearable, though it's not a good idea to want to carry it around in the hand for any length of time (I tried).
This prompted me to play around with the 50mm f/1.2 on the M10, with the additional grip, without it ... The whole combo is about 100g lighter, so, not a lot. Sadly, Leica's original grip for the M10 feels really quite uncomfortable for me (not while carrying but while shooting - it's a real stretch to reach the shutter button), because it solves the only irritating issue I feel the combo has: You can't set it down on a surface without the camera tipping forward and the aperture ring taking the hit. Again, it's pretty front heavy (of course it is - everything above 250g and a certain length causes the combo to tip; it just about balances with the Voigtländer APO-Lanthar 50mm f/2 *on a good day*). But with my compact combo (just using Leica's thumb rest), it's quite manageable, and certainly not much a pain to carry. So, the 50mm f/1.2 is definitely better at home on the M10 ... Go figure.
Which leaves me scratching my head a bit. I thought I had elegantly gotten around the fact that Voigtländer just issued their 40mm f/1.2 (which is almost as desirable as the 50mm f/1.2 - but not quite) for Z mount. I know how well Voigtländer's chipped lenses work on Z bodies - I own two of their APS-C lenses for the Z fc. Now, the nagging feeling that it would be a really nice thing to have is back. And the price of the new lens isn't that high at all, comparatively speaking. This looks like a case of recurring G.A.S. ...
M.