I made it just 2 days...

1935 | NEX-7 & SEL55F18Z | 1/320s f/1.8 ISO100 55mm (35mm eq:82mm) 

Well, I made it 2 whole days (though just 1 shopping day) into 2014 without buying a new lens... though this lens was no impulse buy. It's the new Sony FE (full-frame image circle E-mount) Zeiss Sonnar 55/1,8 lens  (model name: SEL55F18Z ). This lens has an MTF curve out of this world (stellar light transmittance, essentially - Zeiss have a white paper on the topic). In practice, this means that the lens has extremely high resolution and contrast "wide open" at its maximum aperture (opening). Designing a lens like this is no mean feat - I've never seen a curve like it. The lens outputs an image circle covering the size of a full-frame sensor, like my RX1, but I am currently using the lens on my trusty NEX-7.

Is this my next camera? There's a full-frame sensor squeezed inside the miniscule Sony A7R.

After purchasing the lens in Akihabara, we decided to go for a walk and test out the new lens. What better way to test a lens and camera than at night? :)

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It's probably a little early for a verdict, but overall, I'm very impressed. The high pixel density, cropped sensor (APS-C size) of the NEX-7 really tests the central zone of any lens.

Sometimes it's easy to forget we're in Tokyo

Sometimes it's easy to forget we're in Tokyo

There is a 50/1.8 lens, with optical stabilisation, already available for Sony E-mount cameras. It's been around a couple of years. It's maybe 1/3rd the price of this lens, but only covers the APS-C image circle, and thus would not be useful on any future full-frame camera. Rather than sink my money into a lens I'll use (happily) until I "go full frame", I decided to spend that little bit more, and "future-proof" myself with a world-class lens. 

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And I have no regrets.