PROBLEM TO BE SOLVED: To secure specified back focus and the position of an exit pupil and to obtain excellent image-formation performance with little ghost by constituting the lens of a front group having negative refractive power, an aperture diaphragm and a rear group having positive refractive...
85mm f1.8 Portrait Lens - EF Lens for Canon Telephoto Manual Lenses Camera for EOS Rebel T8i T7i T7 T6 T6s T6i 90D 80D 77D etc $65.00-70.00 查看商品详情 有用(0) 第一次通过阿里巴巴购物通过这家商店,我对镜头非常满意。我希望我能再次在这家商店购物。谢谢 optical telescope telephoto zoom ...
You said you already have your glass but should you be looking for a new super wide angle lens I can recommend the Irix 15mm f/2.4 Blackstone in Canon EF, all metal construction, with a positive click at infinity and a lockdown ring, also markings for hyperfocal range, all manual but t...
PROBLEM TO BE SOLVED: To provide a compact zoom lens with less distortion and less curvature of image field at the whole focal distance including near a short focal distance end, in the case that a viewing angle is extremely wide, that is, the viewing angle is ≥90° at the shot focal...
enlargement side and is wide-angle but low in cost, a projection lens used for the wide-angle lens, a relay lens used for the wide-angle lens, and a projection type equipped with the wide-angle lens Provided are a display device and a relay lens unit used in the projection display ...
PURPOSE:To enlarge the incident picture angle of an image fiber, by forming the real image of an object just before the end face of the image fiber by means of the 1st lens, and then, forming the image on the end face of the image fiber by means of the 2nd lens. CONSTITUTION:The ...
A wide angle MWIR F-theta lens with an F# of 2. The lens is deployed on airborne platforms for remote sensing applications. The lens is corrected for monochromatic and chromatic aberrations over the wavelength range 5000 nm-3300 nm. The image of the remote target is formed on a focal ...
PROBLEM TO BE SOLVED: To obtain a compact, high performance and inexpensive simple wide angle zoom lens suitable for an electronic still camera in spite of having an extremely small lens constitution, i.e., four-lens constitution consisting of three groups successively arranged from the object ...
A super wide angle lens (10) is a super wide angle lens which is of high-resolution and whose size, weight and cost can be reduced. It employs a four-group five-element constitution in which in the order from an object side, a meniscus single lens (11) having a negative power, a ...
PURPOSE:To obtain a compact lens system including wide angles with a simple lens structure, by providing 8 numerical limits for a zoom lens system consisting of the scattering lend group and convergent lens group. CONSTITUTION:The front scattering lens group comprises the 1st convexnegative meniscus...