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As a DSLR owner, I am currently looking for a compact interchangeable lens camera and I currently hesitate in buying the Sony NEX-5N or the Panasonic GX1.

I realize the lens options for the Micro Four Thirds cameras are great, and are somewhat limited for the NEX cameras.

Apart from the Sony NEX 16mm f/2,8, do I have other options for a pancake lens?

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Personally I feel like the panasonic 20mm f/1.7 pancake lens is a strong pull toward the GX1 rather than the Sony line. –  Daenyth Apr 10 '13 at 13:54
    
For comparing different mirrorless systems based on their lenses, see How much do lens lineups vary across Mirrorless camera systems? –  mattdm Apr 10 '13 at 15:03

4 Answers 4

up vote 2 down vote accepted

As Sony works to expand their system, they've introduced a few more pancake lenses. You can see the entire lens lineup on Sony's E-mount Lenses page. Of these as of 2013, there are two "real" pancake primes plus a collapsing zoom lens which reasonably could be categorized the same way.

The 16mm was widely panned (um, slight pun intended; sorry) by reviewers. For example, SLR Gear says: "It's an interesting little lens, but its price point and its performance are perhaps limiting it to strictly consumer application." The 20mm is new enough that it's not widely reviews, but a common presumption is that a second pancake so similar in focal length could only be to quietly answer those complaints. The MTF chart in the Sony info page linked above certainly looks much better, and unless you have a very compelling need for your lens to be a little bit wider (about 12° horizontally), it's probably worth the extra $100.

There aren't currently any third-party E-mount lenses which could be considered pancakes. It would be pretty silly to use an adapter to mount a DSLR pancake (for example, the Pentax 40mm f/2.8), because the size of the adapter would dwarf the lens, but adapters to Micro Four Thirds appear to be available and are pretty small (only adding 2mm), meaning you could use pancake lenses for that system if you don't mind manual focus. (That'd probably also be a little silly, but if you've got multiple systems, access to the lenses, etc., it could be an option.)

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Some lenses meant for other mounts can be used with help of adapters. For example, Zeiss Planar 35/2 for Contax G. With a Pentax adapter, you could use the Pentax DA Limited line pancakes (21mm, 40mm and 70mm). Pentax, Canon or Nikon adapter would let you use Voigtländer's Ultron 40mm f/2 or Color Skopar 20mm f/3.5 with corresponding mount.

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Is there any lens mount adapter that provide auto-focus? Or the only lenses that would support auto-focus would be the native e-mount lenses? –  decasteljau Jan 16 '12 at 14:44
    
The only lens adapter I know that supports auto-focus is the Sony LA-EA2 meant for using Sony Alpha lenses on a NEX. I don't think such exists for the Pentax lenses, which use screwdriven AF - so the adapter should provide the motor. The Voigtländers and Zeiss are full manual focus lenses anyway. –  Imre Jan 16 '12 at 20:11
    
This is a good take on the question, because one of the strong points of the NEX system is the ability to use legacy lenses with a more reasonable crop factor (1.5x) than micro 4/3 (2x). –  JoséNunoFerreira Jan 23 at 16:19

Unfortunately in the mirrorless world only within the micro 4/3 standards you will find a good lens range even 3rd party ones.

In the Sony realm there are no other options for pancake lens as they have a unique system, so you can't use the micro 4/3 as you seem to know already.

To help you choose I leave here a site that I follow which publishes new, reviews and rumors about mirrorless cameras and they recently have published a post that might interest you a lot - http://www.43rumors.com/panasonic-gx1-review-at-techradar-and-nex-5n-comparison/

In the end if you are looking to aquire more gear later for the camera or even use adaptors for the DSLR gear that you might have I think you'll be better served with the GX1. On image quality the Sony is generally better although in lower ISO's as they say, in the review, that the difference between both cameras is pretty unnoticeable.

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The Sony NEX 16-50 mm pancake zoom is now available.

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