35mm panoptic

× 10.16 (cm)7x5 (7 inch 5R) 17.78x12.70 (cm)8 × 6 (8 inch 6R) 20.32 × 15.24 (cm)10 × 8 (10 inch 8r) 25.40 × 20.32 (cm)12 × 10 (12 inch) 30.48 × 25.40 (cm)14 × 12 (14 inch) 35.56 × 30.48 (cm)16 × 12 (16 inch) 40.64 × 30.48 (cm)18 × 12 (18 inch) 45.72 × 30.48 (cm)18 × 14 (18 inch) 45.72 × 35.56 (cm)20 × 16 (20 inch) 50.80 × 40.64 (cm)20 × 18 (20 inch) 50.80 × 45.72 (cm)24 × 20 (24 inch) 60.96 × 50.80 (cm)30 × 24 (30 inch) 76.20 × 60.96 (cm)32 × 24 (32 inch) 81.28 × 60.96 (cm)36 × 24 (36 inch) 91.

say, the focal length of the lens is 36-432; F = 100mm, and the focal length is twice that of f = 50mm. This computation is simple. Dividing the longest focal length by the shortest focal length can result in an optical multiplier of the lens. For example: 432mm/36mm = 12, then the lens is scaled by 12 times.The focal length is easy to understand. We all know that the longer the focal length, the larger the object to be taken. The shorter the focal length, the smaller the object to be taken. Th

It is not hard to tell from the extensive publicity of canon that the story of Canon began in 1933, precisely because it was founded in November 1933 by the "Institute of precision optics ...... In that year, as the "camera country" of the world, Germany had two major brands-Leica/Leica and Conway's/contax. Both companies are producing 35mm focal plane shutter cameras that represent the highest technical level at that time. In the early 1930 s, Le

of depth. 1. aperture value... the larger the aperture, the deeper the depth of the scene... the deeper the depth of the field. 2. Focal CIDR... the same as the aperture in large hours... the wider the focal CIDR... the deeper the depth of depth... the less the depth of depth... 3. The distance between the camera and the object to be taken... the closer the distance... the lighter the depth of field... the deeper the opposite. Remember the above three reasons Let's look at the APS-C vs FF body

Photo size (INCHES) (CM) (pixels) digital Camera type 1-inch 2.5*3.5 413*295 ID card size photo 3.3*2.2 390*2602-inch 3.5*5.3*626 small 2-inch (passport) 4.8*3.3x567x3905x3.5x12.7x8.9 pixels x840 + 1 million pixels 6-inch 6x4 15.2*10.2 1440x960 + 1.3 million pixels 7-inch 7x5 17.8*12.7 1680x1200 or above 2 million pixels 8-inch 8x6 20.3*15.2 1920x1440 + 3 million pixels 10-inch 10x8 25.4*20.3 2400x1920 + 4 million pixels 12-inch 12x10 30.5*20.3 2500x2000 + 5 million pixels 15-inch 15x10 38.1*25.

is still a problem. However, in general, the quality of the secondary plant lens has been improved a lot. In addition to the opening of a few phenomena, there are already many classic excellent lenses worth buying. I will write a dedicated recommendation for the secondary plant lens later. 2. According to the focal segment In fact, the traditional 135 lenses are generally divided by focal segments. The conventional method is as follows: 10-17mm for Ultra Wide Angle-mainly shooting lands

Angle of View The same concept as field of view 35mm equivalent focal length Crop factor The termsCrop factorAndFocal length multiplierWere coined in recent years in an attempt to help 35mm film formatSlr photographers understand how their existing ranges of lenses wocould perform on newly introducedDSLR cameras which had sensors smaller than the 35mm film form

/1.4 USMEF 70-200mm f/4L IS USMMarket reference price: ￥5120 + 2560 + 8580C: As mentioned above, the overlap of focal segments of EF 17-40mm f/4L USM and EF 24-105mm f/4L is usm is always uncomfortable, in fact, the gap between EF 17-40mm f/4L USM and EF 70-200mm f/4L is usm is 30mm blank blocks, which have no significant impact on blank blocks, the addition of an EF 50mm f/1.4 USM immediately increased the aperture. This saves a lot of votes, and the basic quality is not too low. EF 24-105mm f/

After measuring the MTF value curve of each lens, the Hassu lab developed a calculation method for the average value of the MTF. First, the preset focal length is used to calculate the MTF value of the lens F4, multiply by the focusing coefficient of 0.4 and 0.6 respectively to obtain the MTF value of a first-line frequency, and then multiply the average value of the 10-line/millimeter value by the focusing coefficient of 0.57, the average value of the 20-wire pair/millimeter is multiplied by th

, the camera is shot with a focal length of 33mm, and the angle of view is equivalent to about 53mm under the 35mm specification. You can zoom in to adjust the shooting range at any time based on the balance between the subject and the background.Shooting DataEF 35mm f/2/manual exposure (F2.0, 1/60 seconds)/ISO 400/white balance: AutomaticUse the F2.0 maximum aperture for shooting. The flashlight is directe

1. Make the scenery output more exquisite picture quality Compared to the zoom lens in the 24mm focal length (for example: 24-70mm/16-35mm), 24mm fixed Gio resolution is higher, if it is coupled with the high pixel model camera, but also the powerful, the output of more exquisite quality. The pursuit of high quality scenery photos You can consider upgrade 5ds/5dsr/d810/a7rii a series of high pixel model camera, I believe than the author in the follow

maximum focal length is used instead of the magnification. Therefore, there is no comparability between 12, 15, and 18 times of optical zoom. If you want to enlarge the number of BB in the lens parameter AA-BB, the larger the better. If you don't want to take a distant object, you should select smaller ones, so that the imaging quality is better. So you can choose a camera that requires several times of zoom. For a zoom lens of 10 times or more, it is rare to have a few good imaging lenses (rel

Many street photographers say the ideal lens focal length is 35mm, because this wide-angle focus on the crowded street to the photographer enough space for the composition, covers a wide range, can be the characters and most of the surrounding environment, also some people say 50mm ideal, like Bresson, almost all works are used 50mm shooting, Because he thinks 50mm is the focal length of the human eye, WYSIWYG, this is the word that the programmer com

and sharp images Sharp and clear edges Best 20 seconds Apparently, in order to get the best image amplification quality, we should use adaptive spline interpolation enhancement (S-S pline _ XL) technology to enlarge the image in optional conditions. 3. pixel aspect ratio adjustment now we use the adaptive spline interpolation enhancement (S-S pline _ XL) technology, based on the 4 K equivalent resolution 35mm × 4096 of 3112 film copies

Crop factor)Because the imaging chip in the camera is usually less than 35mm film, it has different characteristics when you place the lens for the SLR camera on the DSLR camera. It seems that the image has been cropped, so there is a cropping coefficient. For example, a 100mm lens will change to a 160mm lens on a camera with a cropping factor of X (for example, Canon eosdigital rebelxti. Or 75mm of the lens will change to 113mm on a x cropping camera

have obvious effects on the photos, but the photos can still be used. 1 inch = 2.54 cm, we say that the size of the photo is usually in inches. The standard size of the Photo size is within 10 inches. For example, the size of a 5-inch photo is 5x3, 7-inch = 7x5 8-inch = 8x6. If the Photo size is greater than 10, the difference is 4, 12-inch = 12x8 14-inch = 14x10 18-inch = 18x14. 2. Size of common documents 1 inch 25mm × 35mm2 inch 35mm × 49mm3 inch

) 50 AVAYA cat5e unshielded twisted pair wires 3 (box) 1410 Information Module AVAYA cat5e information module and panel 6 (s) 90 Crystal head NORDX RJ45 crystal head 250 (count) 250 Vswitch Huawei sankang S1216 1 (unit) 1300 Huawei sankang S1026T 6 (servers) 5400 PVC pipe PVC-U wire Pipe 35mm 12 (Root) 120 PVC-U wire Pipe 50mm 47 (Root) 550 35mm / 50mm Elbows and tee 90) 45

I would like to share with you a detailed recommendation of photography enthusiasts the combination of lenses used by the Canon 1DX camera.Analysis and sharing:I. Portable, interview, travel, and solutions for taking a picture of the world:(1) Canon EF 24-105mm F4.0L is usm, the price IS 6350 yuan.Advantages: excellent image quality, color and sharpness, fast focus, and powerful anti-shake function.Disadvantage: the aperture is not large enough. The zoom lens will be exclusive and easy to dust.I

Note: For a lens with IS, The number marked later indicates the IS anti-shake level. 1987EF 15mm F2.8 fisheyeEF 28 m F2.8EF 135mm F2.8 (soft)EF 50mm F2.5 macro 1988EF 24mm F2.8 1990EF 35mm F2EF 50mm F1.8 II 1991EF 100 F2 USMTS-E 45mm F2.8TS-E 90mm F2.8 1992EF 20mm F2.8 USMEF 85mm F1.8 USM 1993EF 50mm F1.4 USMEF 400mm F5.6L USM 1995EF 70-200mm F2.8L USMEF 28mm F1.8 USM 1996EF 135 F2L USMEF 200mm F2.8L II USMEF 180mm F3.5L macro USM 1997EF 300mm F4L is

Transferred from: http://www.sohu.com/a/215073729_297710 Original source: arxiv Author: Alexander Kirillov, kaiming He1, Ross Girshick, Carsten Rother, Piotr Dollar "Lake World" compiles: Yes, Astro, Kabuda. Nowadays, we propose and study a new "Panorama segmentation" (Panoramic segmentation,ps) task. It can be said that Panorama segmentation will unify the tasks of separating (detecting and segmenting each target instance) and semantic segmentation (Assigning a class label to each pixel) in t