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| p.2 #2 · Oly 24/2.8 vs. Canon 24L TS-E II |
No, no, no. This is a categorically incorrect interpretation of focal length.
I never said anything about focal length being longer...
I know you think I'm whack, but please give me a little credit for not being a total moron.
The oly is physically 31mm long, the TSE is physically 107mm long ... that's physically 76mm longer, which yields a different working distance when the film plane/camera position remains constant.
I've assumed nothing. I've simply done exactly as I stated ... i.e. shot two different lenses from the same shooting position and recorded the results ... nothing less, nothing more. Upon realizing that the PHYSICAL length of the two lenses is different enough that it impacts the perspective, I've indicated a re-shoot is warranted.
And what I tried to explain to you is that the physical length of the lens does not affect the perspective. It is the distance from the object to the plane of focus (i.e., the sensor) that affects the perspective.
You seem to be under the misapprehension that the difference in the field of view between the two images is due to the larger size of one lens. And what I am telling you is that this belief is entirely false.
The question was asked why it showed two different position/perspectives. The answer is simply that one lens is three inches longer than the other and thereby, while shot from the exact same film plane/camera position, the working distances are different and have yielded a different perspective.
NO. This is incorrect, as I explained in my previous post. The working distance does not relate to perspective; it is the SUBJECT distance--the distance from the focal plane to the object in focus--that relates to the perspective. Because, as you claim, the camera body was not moved between lens changes, the conclusion is that the focal length of the system could not be the same if the resultant framing from each lens is different. The difference in framing has nothing to do with one lens being larger than the other. I cannot stress this enough.
Would you prefer I equalize the AOV or the working distance for the re-shoot?
I realize that no matter what I do you're going to criticize the integrity of it, so I'm wondering why I should even bother.
I am unconcerned with the question of whether to equalize the framing. I don't even care about which lens is sharper. I am not here to question the integrity of your testing methodology. I am merely correcting what I consider to be your misunderstanding of certain optical concepts, so that should you care to gain a better understanding of the theory, the information is there for you to learn. It is entirely up to you whether or not you want to accept it or not.