Yes, focal lengths marked on lenses are all related to full frame field of view. Even smaller 1/2" sensor C-mount lenses do the same, though of course, you need to factor in the additional 2.6x crop of ETC mode (needed to fill the GH2's frame). Beyond body contacts and size, that's the only difference between using an MFT lens and a Nikon/Canon/etc. The focal length is the same for both cases.Exactly.Īnd lenses made specifically for smaller sensors (APS-C, MFT, etc.) still use the same focal length formula, but don't need to make the glass as big, since the sensor sees a smaller section than a FF sensor does. Most wedding photographers will slap on the zooom lens and adjust.īecause they are both 50mm lenses. ![]() so I want a Field of View of about 16'x8', what 'lens length' do I need to get a reasonably 'filled frame', that is head and feet not crowded, and enough width (hence the slightly larger numbers for the desired FoV.). I'm in the back of the church, at about 75 feet, the groom is approx 6', the Bride, Groom and Minister 'shot' is about 12 fee wide. They usually do not calculate like the following. they just think in terms of 'wide angle', 'normal', 'telephoto', or 'long telephoto', or perhaps 'portrait'. I will also note that most 'ordinary' photographers don't usually think in terms of Angle of View or Field of View in terms of 'hard numbers'. The focal length is the same for both cases. The 'larger sensor' results in lines (red lines) that are wider at the 'subject' line, the smaller sensor results in narrower lines (blue lines). call that top horizontal line the 'subject line'. Notice how the lines that extend out to the 'top of the diagram'. In the case of APS-C, that is the 'slightly larger' sensor to the GH-2. The diagram works in general for any comparison between a larger sensor and a smaller sensor. Ignore that 'cropped sensor' business and replace the phrase with 'smaller sensor relative to larger sensor'. I don't know what that is addressing since I'm just getting an arbitrary 'geometrical drawing' for the purpose of illustration.). (Note ignore that 'green' rectangle and 'green' lines. ![]() If you want to think about 'comparisons', then 50mm on the GH-2 is the 'same'(almost.) as a 100mm on the full frame 35mm still camera. ![]() So why does my Panny zoom at 50mm see the world the same way the Nikon 50mm does on the same GH2 body?Because they are both 50mm lenses. so I've not looked at the 4:3 capability at all. ![]() so how does that affect the Fov/AoVĬalculations. The GH-1 has a couple of different aspect ratio options. I long ago decided to think in terms of Field of View or Angle of View, then ask 'what is required for my camera to achieve that'.Ĭalculating these things is tedious, and sometimes errors are due to not really knowing exactly how much of the sensor is being 'used' by the media. if it was important to get a 'feel' for the telephotoness. a 70mm lens would be like(sort of.) her 105mm on a full frame. we need to upgrade her to something like the D800 or whatever 'next year's new thing is.'.).įrom that 'jumping off point'. rather than just simply stating 35mm focal length lens is 'normal'. She was totally confused about when, and how to apply the 'magic number' ratio.Įven now she still talks about 1.4x. The Wife took a 'long time to assimilate' the difference between her full frame still 35mm experience and the digital DSLR's we looked at, and eventually bought.
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