Nikkor 18mm f4 AI sharpness on corners?

Started Jun 20, 2013 | Discussions thread
brightcolours
Veteran MemberPosts: 9,929
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Re: makes no sense
In reply to gammada, Jun 24, 2013

gammada wrote:

brightcolours wrote:

A 18mm prime on APS-C? Why? You are better off just using a 18-55mm VR kitlens, to be frank.

If you were talking about a D700 instead, it would make sense.

Just look at an UWA zoom for APS-C. Either the Tokina 12-24mm f4 DX, or the Sigma 10-20mm f4-5.6 DC. Or if you have a bit more money to spend, either the Tokina 11-16mm f2.8 DX or the Sigma 8-16mm DC.

Any idea on how sharp is the Tokina on the corners? Price is spot on for me.

As for why would I want an 18mm lens on an APS-C sensor, well, it all has to do with geometric distortion. Since the photos I sell must have perfectly aligned horizontal and vertical lines, I'm a bit afraid of going wider and then having to do extensive work fixing that distortion.

Ok, now I kinda understand why you are considering the 18m Nikkors, you hope them to be free of barrel distortion. It is hard to know how they perform on APS-C, the 18mm f3.5 for instance bulges a little bit in the center according to Ken Rockwell, but is relatively straight at the edges.

http://www.fredmiranda.com/forum/topic/938110

Both Tokinas (12-24mm f4 DX and 11-16mm f2.8 DX) are sharp enough in the corners, but both can need good CA correction (not the coloured edge masking kind) to get the most out of them.

http://www.photozone.de/nikon--nikkor-aps-c-lens-tests/638-tokina1224dxii?start=1

http://www.photozone.de/canon-eos/666-tokina1116f28eos?start=1

The Sigma 8-16mm is good also:

http://www.photozone.de/canon-eos/515-sigma816f4556apsc?start=1

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