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The focal length of a lens is a measurement taken when the lens is imaging a far distance object like a star. If the lens structure is a single symmetrical (convex – convex) then this measurement is taken from the center of the lens to the focused image. A distant object is at an infinite distance when its light rays arrive at the camera lens a bundle of ...


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The first Wikipedia quote of "If the medium surrounding the optical system has a refractive index of 1 ..." is simply saying that if you take your camera underwater, the focal length will change as compared to air due to the different media index of refraction. The second Wikipedia quote of "... When a photographic lens is set to "...


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My first reaction to this question was 'WHICH one does he think is better?' Is one technically superior? Hard to tell on screen. One's a great picture of a gorilla. One's a great picture of a cat. Personally, I like gorillas.


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Pancake is better for filming, but for (movement) photography, this old big plastic is better - When u have pancake mounted u can't count on fast change of focal lenght, which is sometimes croucious.


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The canonical definition of macro photography is that the image on the sensor is at least as large as the subject. For that to be the case, the focusing distance measured from "the lens" has to be the same or smaller as the focal length. "the lens" here is the nodal point of the lens, namely where a single idealized lens could replace ...


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The "closer to the sensor" advantage of which your friend speaks has a lot more to do with the distance between the sensor and the flange upon which the lens is attached, referred to as the registration distance (or colloquially as the flange-focal-distance) for a particular lens mount system, than it has to do with the different distances to the ...


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First, consider a simple one element lens, like a magnifying glass. The distance from the lens to the "sensor" is the focal length. A long focal length will be more distant from the sensor. (this is the "thin lens" formula). However, such a simple lens has aberrations, optical faults (primarily, a single element cannot focus all colors ...


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I'd like to keep [the camera] as intact as possible. Looks like you've already accepted Kai Mattern's answer. I don't know the camera in question or, whether it's focusing screen was intended to be user replaceable. (With some high-end SLRs you can swap different screens in and out, while with others, you're stuck with whatever screen was built-in.) But ...


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If you set an lcd screen in the place of the translucent viewfinder screen, this should do the trick. The lens itself is not needed. You already have the images in the desired size and sharpness. You could test this by placing an old negative onto the translucent screen and see if that appears sharp if you shine some light through the lens. If that works, ...


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Will this Lens Mount work with the Canon lenses I have? YES, It will allow you to mount your FD, or FL, lens's to your PEN E-PL1 but see note below, I can not speak to functionality as I know nothing about the PEN E-PL1. From the amazon link. Note: This is a manual adapter, so lens functions that rely on electronic communication with the camera body (...


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Things to consider… 35mm in a DX body will let you take full body shots from reasonably close. This will, however, give you 'short legs syndrome' if you're not careful. Shooting from any lower than chest height to try balance the leg length starts to get a bit 'up the nose'. Your bokeh will be harder to achieve on a relatively wide lens, even with the ...


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When adding a non mft lens it asks for the mm size do I put it with the 2x crop like a a 50mm FF = 25mm mft or do I use full frame size?


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That is the autofocus drive mechanism and it is supposed to be below the surface anytime the camera is not trying to focus a lens. The lock/unlock pin is also raised as it is supposed to be; but you mentioned that the release button sticks in the down position. It is possible to bend the release pin so that it binds in the opening (I've done it). Are you ...


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Now that we finally have enough information to accurately answer the question: Mostly the differences aren't about your lens, they're about the light. There are several differences between the two images that cause the first to look less "sharp" than the second. Although both were taken with your lens at 250mm, you cropped the first tighter than ...


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Bit of a zombie thread but in case anyone else is looking here ... The Yashica Mat has a 4 element taking lens. The rear two elements are cemented together. They screw out quite easily from the back (provided you have a lens spanner). The front two elements are not cemented together and have an air gap that means fungus can grow in between. Once you screw ...


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