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PapaFly

Member Since 02 Oct 2007
Offline Last Active May 12 2009 02:22 AM
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Topics I've Started

Nikon D80 -> Fisheye -> Overexposure

14 December 2007 - 03:13 AM

Hi guys, I use a D80 in an ikelite-housing, and the tokina 10-17mm fisheye. I know my gear, shooting some 20000shots a year.
There's one thing that bugs me about the fisheye:
no matter if i shoot on land or underwater, almost every single fisheye shot would overexpose if i wouln't manually underexpose at least 1.3stops. By overexpose i mean huge areas with clipped channels. Camera would even allow for 1/3-1/2 of the image to clip into pure white, and not only areas at the image borders. All this while using the matrix metering. The same camera, same matrix metering mode with the tokina 12-24mm and i get spot on exposures. Of course the fisheye is wider, but the 12-24 is also very wide and exposes correctly. I have the feeling that nikons metering system (at least the one in the d80) is absolutely unable to handle the fisheye. Imagine a boring, normal land shot, late afternoon, no sun in or near the image, horizon in the middle to mask fisheye distortion, blue sky above, ocean and rocks below, and i have to dial in -1.3stops, wile the 12-24mm is spot on!

Anyone noticed this? Are the higher-end nikon dslr better?

Tokina 10-17mm and DXO anyone?

04 October 2007 - 02:18 AM

I just saw that the DXO folks are now supporting the Tokina 10-17mm fisheye we love so much! Had my fingers crossed for long, hoping they would support it.

So, has any of you tried it on the tokina? On landshots and/or watershots?

Here's what I'm curious about:

- CA: this issue seems a bit too complex to be effectively removed in PS's raw converter. I see that CA's are unevenly spread from corner to corner, with less CA in the middle and more at the image borders. If you try the PS correction, you can correct for the borders, but then the middle looks crappy and viceversa...it's always a big compromise.

- Defishing: i don't expect solid results from defishing images shot at 10mm, but - on the other hand - images shot at 12 to 17mm are much less distorted, and could render good results

- The upcoming DXO v.5 will introduce a complete raw plugin, together with advanced noise removal (they say it works on the raw files), and I'm definately