uncleflo
Registered since September 28th, 2017
Has a total of 4246 bookmarks.
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Tag selected: lens.
Looking up lens tag. Showing 14 results. Clear
Tamron 18-400mm f3.5-6.3 Di II VC HLD Wide Angle Lens for Canon APS-C - Black for sale online | eBay
Saved by uncleflo on February 13th, 2022.
Tamron 18-400mm EF-S lens I've been disappointed by the performance of both Canon & Sigma small extreme telephoto zoom lenses, particularly sharpness at the long focal lenses. Then along comes this 18-400mm lens that is the exception to the rule. It autofocuses well even at 400m zoom (at F6.3) given reasonable contrast. Focus is quiet, the anti-vibration feature provides a useful damping of shake, and at F8 the images is less than about 1 pixel blurred even at this huge zoom. At wide angle there is a little exposure fall-off at the corners. Not exceptionally lightweight but perfectly well balanced with the EOS 7D - quite a heavy camera for an EF-S mount. This lens has transformed the usefulness of the 7D as a medium sized setup to for wildlife photography. Not not quite at the quality of an EOS 1D Mk IV + huge and heavy Sigma 50-500mm IS (NLA) but much easier carry and hold and a good choice for a long trek.
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Lenses Database - DxOMark
Saved by uncleflo on May 11th, 2021.
DXOMARK's comprehensive camera lens test result database allows you to browse and select lenses for comparison based on their characteristics, brand, price, lens type, lens size, focal range and aperture. You can also select a camera to see the results for all the lenses tested on it. With DXOMARK you can display the lenses with three different views - Grid, List or Graph in order for you to have the best solution to compare the filtered results. Choose the lenses you want to compare from the results below. Then in the selection box, you can check up to three lenses at a time to compare their measurements.
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Why are modern 50mm lenses so damned complicated?: Digital Photography Review
Saved by uncleflo on May 11th, 2021.
Back in the days when men were iron and ships were wood, there were some things you could rely on. One of those things was your wide-aperture prime lens was a relatively simple double-guass design. Pre-1900, lens designers had already created five of the six lens types that are the basis of what we use today. (The retrofocus lens didn't come around until the 1920s, and zoom lenses, for those who are curious, are basically modified Cooke triplets.) The double gauss has been THE predominant design for wide aperture primes since the late 1800s. Over the years, designers have added additional groups to bring in more light, correct aberrations, and generally make a better lens. But the double gauss part was there in the center of the lens diagram for wide-aperture prime lenses right up until modern times. Name a famous prime lens and it was probably a double gauss: Speed Panchro, Planar, Xenon, Summicron, Takumar, Ultron, and on and on.
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How to Test Your Lens | B&H Explora
Saved by uncleflo on January 6th, 2019.
So, you just bought a shiny, new, and maybe expensive, lens for your camera, and being the savvy consumer, you did your homework. You pored over customer reviews on the B&H Photo website, read online reviews splattered all over the Internet, grabbed a copy of every photo magazine that reviewed the lens, bookmarked dozens of websites, and now have the lens’s MTF curve charts burned into your retinas. Now, your lens is here and it is time to go out shooting. Honestly, not a problem. Your lens should be as good as it can be and, as photographers, we want to take photos. So, stop reading and go out and make some photographs! Still here? OK, let me tell you why you might want to test that lens yourself. The main reason is that even with today's precision computer-controlled manufacturing techniques, there are variations in each and every lens that rolls off an assembly line. This means that some examples will be better than others. Some lenses will be outstanding and others will make you wonder if all of those glowing reviews you read online were completely bogus.
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Lens Tests: A Simple Method
Saved by uncleflo on January 6th, 2019.
This is a simplified subjective method of testing lenses optical sharpness. This should not be confused with tests for focus accuracy and discrimination in a 3D environment, that is a totally different issue although often confused by the inexperienced. A focus accuracy test is suggested here Focus Test. The advantage over this method, compared to just taking a shot of a garden etc, is elimination of variables such as subject and camera movement, insufficient depth of field, flatness of field and variations in focus location. It uses a nice consistent high contrast subject to make comparisons easy; checking sharpness on general photographic views is not very easy. As the method is subjective, it is worth testing against a known good lens for comparison.
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ISO 12233 — Resolution and spatial frequency responses | imatest
Saved by uncleflo on January 6th, 2019.
This new standard defines three test charts. The new Imatest eSFR ISO module performs a highly automated analysis of the new low contrast (4:1) Edge SFR chart and is available in Imatest Master and Image Sensor 4.0. This chart does not work with the highly automated Imatest eSFR ISO module, described below. For highly automated measurements (including squares near the corners, color patches, and wedges) we recommend one of the Imatest eSFR ISO charts shown below. These charts are fully compliant with ISO 12233:2017. Supported by the Imatest Star Chart module. Optional automatic region detection is available when used with a star pattern that has registration marks on the sides of the image.
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Moment - Wide 18mm Lens for iPhone
Saved by uncleflo on November 29th, 2018.
The New Wide Lens is an everyday, go-to wide-angle lens for mobile photographers and filmmakers. Its new glass and wide angle design allows your phone to capture 2x more picture. The most advanced lens we’ve ever made, the New Wide Lens captures smartphone photos and videos that are beautiful, crisp, and straight, with no fisheye distortion.
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Canon EF 28-300mm f/3.5-5.6L IS USM Lens
Saved by uncleflo on July 23rd, 2016.
The EF 28-300mm f/3.5-5.6L IS USM Lens from Canon is an all-in-one zoom lens for versatile and easy subject selection for multiple photographic applications. This lens offers the highest optical performance in its class, plus the convenience of focusing as close as 2.3 feet over the entire zooming range.
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Account Options
Saved by uncleflo on July 19th, 2016.
A credit card deposit is required to the full replacement value of the equipment being hired and payment for the rental fee on return of the goods. You are required to submit Photo ID such as a current passport or drivers licence and 2 recent proofs of address (no older than 2 months old) which will be security checked. It is best to email this in advance and bring the originals along to your first collection.
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graphics.stanford.edu/courses/cs148-10-summer/docs/2006--degreve--reflection_refraction.pdf
Saved by uncleflo on February 22nd, 2015.
When writing a ray tracer, sooner or later you’ll stumble on the problem of reflection and transmission. To visualize mirror-like objects, you need to reflect your viewing rays. To simulate a lens, you need refraction. While most people have heard of the law of reflection and Snell’s law, they often have difficulties with actually calculating the direction vectors of the reflected and refracted rays. In the following pages, exactly this problem will be addressed. As a bonus, some Fresnel equations will be added to the mix, so you can actually calculate how much light is reflected or transmitted (yes, it’s possible). At the end, you’ll have some usable formulas to use in your latest ray tracer.
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Amazon.com: NEU SEX (9781576875568): Sasha Grey: Books
Saved by uncleflo on July 16th, 2014.
Sasha Grey, rising adult film and pop-culture star, takes control in her new monograph neü sex, moving out from in front of the camera to behind it, turning the lens on the wild world she inhabits. “When I first got into the adult industry, I decided to take my photography much more seriously. I started taking a camera with me to capture my experiences on set, so it was a moment in time, a memory for myself—not the video that would be seen by thousands of people. On days where I was physically unable to capture an image, Ian, my fiancé, became my third arm. He understands my aesthetic, or lack thereof. Ian is a photographer, yet the work in this book is quite different from his usual style. When you are so close with someone, there is a shorthand and true understanding of what the other person is trying to accomplish. If there’s something I am physically unable to photograph, I can say one word and Ian can assist me with my vision. Ian can capture intimate moments with me that nobody
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RED Digital Cinema Cameras, Lenses and Accessories
Saved by uncleflo on May 24th, 2013.
Comprised of the Meizler Module, REDsync Master, Wireless Receivers and the REDSync App, the REDlink product family includes everything one needs to go wireless on set.RED®, RED CAMERA®, RED EPIC®, SCARLET®, RED ONE®, REDRAY™, MYSTERIUM®, MYSTERIUM X®, R3D®, REDCODE®, REDMOTE® and all other trademarks, service marks, trade names logos, and product names of RED used on this site are trademarks or registered trademarks of Red.com, Inc. in the USA and other countries.
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Stereo Pair Photography
Saved by uncleflo on September 5th, 2012.
Stereo photography involves taking a photograph from two positions, these correspond to two "eye" positions. The two cameras cannot just be arbitrarily separated and point in roughly the right direction. The separation depends on the distance of the closest objects in the scene and the degree of stereo one wishes to achieve. The cameras should be angled inwards * so that imaginary rays projected into the scene intersect at a depth that is intended to be at the projection plane. Objects that are closer than this intersection point will appear to be closer to the viewer, points behind this intersection point will appear to be further from the viewer. There is a limit to how close objects can be made to appear and still provide comfortable viewing, a general rule of thumb is for the camera separation to be around 1/20'th of the distance where the camera rays intersect.
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Loreo lens makes your Canon DSLR a 3D camera
Saved by uncleflo on December 21st, 2010.
If you like your Canon DSLR but are intrigued by the ability to take 3D pictures a new lens from Loreo called the Stereo Lens-in-a-cap promises to let you keep your cam and add 3D capability. Granted, the lens may well be the ugliest accessories that you well ever attach to your DSLR. The lens is cheap at $165 and has a pair of lenses that connect to your DSLR lens mount made into one device. It looks a lot like a point and shoot glued onto the front of a DSLR to me. When you press the shutter, you end up with one picture with two images in it.
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