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What is this mystery Vivitar lens mount?

Vivitar rebranded lenses made by other manufacturers. Your lens is made by Tokina with a T4 or TX universal mount, which uses adapters to fit different cameras. The TX mount is a revision of the T4 ...
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1 vote

Buzzing Noise and error 01 canon camera

Hi I have a canon rebel T3 have a canon 75-300 mm lens. When i lock the lens in and turn on it starts to make a buzzing noise and I get error 01 when I try to take a picture. The buzzing noise sounds ...
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Buzzing Noise and error 01 canon camera

I checked the manual on the Canon website. It has a section on error codes. It says: If there is a problem with the camera, an error message will appear. Follow the on-screen instructions. Error No. ...
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What's the difference between vignetting and pinhole?

We all seem to understand that light rays by law of physics can not bend when passing through any given pinhole ! Yet they turn upside down ? So if we photograph a standing Man with hat on ? The light ...
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Are most (if not all) lenses' focal length described as the 35mm equivalent?

In general: Interchangeable lenses are marked/designated/marketed with their actual focal length. Thus, a 50mm APS-C lens and a 50mm FF lens will both give the same angle of view on an APS-C camera. ...
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1 vote

Are most (if not all) lenses' focal length described as the 35mm equivalent?

The short answer is: "No" For Example the Zeiss Distagon 40mm for Hasselblad medium format (6x6) is a wide-angle lens (it would correspond to 20mm when compared to "classic" lenses)...
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8 votes

Are most (if not all) lenses' focal length described as the 35mm equivalent?

Because the 35mm film camera has been around for about 100 years and because it has been popular for 2/3 of that time, many photographers are highly familiar with how it performs. Thus, it has become ...
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8 votes
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Are most (if not all) lenses' focal length described as the 35mm equivalent?

The focal length is a physical attribute of the lens, regardless of sensor size. The focal length coupled with the sensor dimensions gives you the angle of view, also called field of view, or FOV. ...
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Screw on teleconverter lens

There are some details that will make it easier to answer your question. For example, are the 2x and 3x teleconverter lens made by Sigma or Nikon? Are they mounted on the front of the lens or between ...
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1 vote

Tamron SP 500mm mirror lens changing aperture and DOF

No it does not make sense. The 500mm focal length is true when imaging an object at infinity (about 2000 focal lengths or more distance). When imaging at 40 feet, you must rack the lens forward to ...
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2 votes
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Tamron SP 500mm mirror lens changing aperture and DOF

Depth of Field calculators assume that the Circle of Confusion is a consolidated circle that changes size in proportion to the F stop, but catadioptric lenses have a central obstruction, which creates ...
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