Aperture mechanism of Canon 50mm f/1.8 II lens, with 5 blades. Generally, one would want the aperture to be as large as possible, to collect the maximum amount of light from the distant objects being imaged. This lens is constructed with a metal body and mount, and with plastic extremities and switches.
Because of its rather high native magnification, it can be used for some macro type photography. Contents Technical information The EF 300mm is a L series lens. Editorial Reviews It outlines a lot of things, from the history of Canon, their EF lens range, detailed descriptions of every lenses to date, interspersed with a few hints for technique and some really lovely examples.
Thus the optical elements built into the lens can be far smaller and cheaper. In exceptional circumstances lenses can have even wider apertures with f-numbers smaller than 1.0; see lens speed: fast lenses for a detailed list. The first is to get an Adaptall mount for either Nikon or Contax. This means that a wide aperture results in an image that is sharp for things at the correct distance.
Its most obvious feature is that it limits the amount of light that can reach the image/film plane. Lenses shown in red (which includes all Canon FD and earlier lenses) cannot be mounted on an EOS body and still reach infinity focus without some intermediate optics. The front of the lens does not rotate nor extend when focusing.
Many telescope and microscope T- mount adapters are available. With a 1.6x body such as the Canon EOS 650D, it provides a narrower field of view, equivalent to a 480 mm lens mounted on a 35mm frame body.
Though not specified by Canon as such, users have reported that the tilt-shift lenses in Canon’s line-up can also be used with the extenders. However, when used with an extender, the lens will not pass on the correct aperture to the camera. Typically, a fast shutter will require a larger aperture to ensure sufficient light exposure, and a slow shutter will require a smaller aperture to avoid excessive exposure.
However you want it set to «1.0». Do NOT dial in the aperture you are using on the lens. The optical construction of this lens contains 15 lens elements, including two UD (Ultra low dispersion) lens elements for the f4 IS USM (for other configurations see chart). This lens uses an inner focusing system, powered by a ring type USM motor. The T2-mount has an M42x0.75 metric thread (0.75mm thread pitch) while the M42 has an M42x1.0 metric thread (1mm thread pitch). Be aware of the difference. Smaller equivalent f-numbers are expected to lead to higher image quality based on more total light from the subject, as well as lead to reduced depth of field.
Pentax 50mm f1.4 Super-Takumar M42 mount — $75-$125 on eBay(credit: -4.jpg#filelinks) I think the answer is generally no, not unless you have to for reasons of cost or unless you just like playing around with old lenses. The distance from the mounting flange on the back of the lens to the film (or digital sensor) is known as the «Flange Back», or the «Flange to Focal Plane» distance, or sometimes as the «Flange to Film» distance. The Canon Extender EF 1.4x II. Image of the Canon 2x III Extender The Canon Extender EF lenses are a group of teleconverter lenses made by Canon.
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