Asferische lens in een vitrine, Japan, Ed van der Elsken, 1985 - 1990
#Asferische #Japan #EdvanderElsken #ASPHERICAL #fotografie #photography #EdVanDerElsken
#aspherical
The Voigtlander Nokton 75mm f/1.5 is Coming to Canon RF Mount https://petapixel.com/2024/03/15/the-voigtlander-nokton-75mm-f-1-5-is-coming-to-canon-rf-mount/ #voigtlandernokton75mmf15aspherical #canonrfmount #aspherical #voitlander #Equipment #canonrf #rfmount #cosina #nokton #News
Panasonic Goes Wide and Fast with the Lumix G 9mm f/1.7 for MFT
#equipment #news #aspherical #leica #lumix #lumixgleicadgsummilux9mmf17asph #microfourthirds #panasonic #panasoniclumix #primelens #ultrawide #wideangle
Leica Unveils the Limited Edition Matte Black Summicron-M 28mm f/2
#equipment #news #aspherical #leica #leicamatteblacksummicronm28mmf2asph #leicammount #limitededition #matteblack #mmount #specialedition #summicron
Cosina Unveils Voigtlander Heliar 40mm f/2.8 for L39 and VM-Mount
#equipment #news #aspherical #cosina #cosinavoigtlander #l39mount #leicascrewmount #rangefinder #rangefinderlens #vmmount #voigtlander #voigtlanderheliar40mmf28aspherical
Cosina Unveils ‘Vintage Line’ Voigtlander 21mm f/3.5 for M-Mount
Cosina has announced a new ultra-wide lens under its "Vintage Line" for Leica M-Mount: the 21mm f/3.5 Color Skopar Aspherical lens. It updates a 2019 design reminiscent of the 1950s to one more akin to the 1970s.
Cosina describes its lens as a combination of an exterior that is reminiscent of the styling of a classic lens (which it says is considered to be a historic masterpiece) with modern photography performance expectations. The result is a finished product that Cosina says offers excellent optical performance that matches modern photography equipment but has the look and feel of a vintage lens.
The lens did have to make some concessions though. The company says that it was able to reach the levels of performance offered in this lens by suppressing the maximum aperture value to a "practical level." This resulted in a lens with high optical fidelity but in a casing that is also compact. Cosina says that it also designed the lens to maintain its image quality in both digital and film applications.
The 21mm f/3.5 is constructed of nine elements in eight groups and features a 10-bladed aperture diaphragm that offers an aperture range of f/3.5 through f/22. The lens interlocks with Leica M-mount rangefinders and has a close focusing distance of 0.5 meters. The front filter threading size if 39mm and the lens features an angle of view of 91-degrees.
The lens will be available in three different variations: Type I, Type II in silver, and Type II in black. Type I is the classical design that Cosina says harkens back to the 1950s, while the Type II designs are more of what would be expected of the 1970s. The Type 1 has been available from Cosina since January of 2019, but the two new Type II designs are scheduled to become available by December of 2021. The new Type II versions feature a focusing knob that is more akin to what is found on modern first-party Leica M-mount lenses for rangefinder cameras and is much more intuitive to hold and focus thanks to how the lens knob nestles into the photographer's finger. While the original Type I design might be historically accurate to the period, the new Type II is likely better for practical use.
Below are a few sample images captured with the lens:
Cosina says that the Voigtlander 21mm f/3.5 Color Skopar Aspherical will be available for purchase by the end of the year for about $834.
#equipment #news #1970s #aspherical #cosina #cosinavoigtlander #film #leica #leicammount #mmount #vintage #vintageline #voigtlander #voigtlander21mf35colorskoparaspherical
How Aspherical Lenses Fix Aberrations and Improve Sharpness
What is an aspherical lens and what does it do? Canon has shared a video that explains the problems engineers face in lens design and how the company solved them using aspherical lenses.
Canon recently celebrated the 50th anniversary of its aspherical lens technology through a new exhibit in its virtual Canon Camera Museum. The aspherical lens exhibition has multiple articles and videos on aspherical and fluorite lenses as well as interviews with project members who discuss the development of the EOS and EF lenses.
Canon says that aspherical lenses have long been known to effectively correct for the various types of lens aberrations that can occur in optical design as well as improve overall image quality. These days, aspherical elements are pretty ubiquitous and can be found in lenses ranging from entry through professional-level optics from a range of manufacturers.
Below are two photo exapmples, one that is shot with a spherical lens and the other taken with an aspherical element:
Image shot with spherical lens element Image shot with aspherical lens element
Canon explains that conventional lenses have a curved surface that is like a slice of a sphere, hence the name "spherical" lens. There are issues with this design, however.
"Compared to light rays passing through the center of a spherical element, rays entering from its peripheries must travel a longer distance in order to reach the image plane, resulting in the light rays converging at different positions," Canon explains. "This causes an effect known as spherical aberration, where point light sources “blur” instead of being rendered as points."
Spherical aberration on a spherical lens element An aspherical lens element ensures light rays converge at the same position.
Spherical lenses also have issues with distortion.
Aspherical lenses were known to correct these issues, but even though the supposed benefits of aspherical lenses was known, manufacturing such lenses was considered extremely difficult for a very long time. Canon says that it was challenging to achieve the precision needed in order to control the curvature at the submicron level (1/10,000th of a millimeter). Aspherical lenses were so hard to make that they were referred to as "dream lenses."
Over half a century ago in 1971, Canon finally released an interchangeable lens for SLR cameras that included aspherical lens elements. Since then, the company has continued to refine processing methods and precision technology and says that it has been part of spearheading the constant improvement of image quality via aspherical lenses.
A great deal more information about aspherical lenses and Canon's implementation of them in its lineup over the years can be found in the special exhibition on aspherical lens technology in the digital Canon Camera Museum. Within, Canon also has a great explanation of the capabilities of fluorite glass. All the information and videos are free to peruse.
_Image credits: All images provided courtesy of Canon. _
#educational #equipment #technology #aberrations #aspherical #asphericallens #barreldistortion #canon #canonmuseum #chromaticaberration #distortion #lensdesign #pincushiondistortion #sharpness #sphericallens
Cosina Launches the Voigtlander 28mm f/2.8 SL II S for Nikon F-Mount
Cosina has announced the Voigtlander Color-Skopar 28mm f/2.8 SL II S Aspherical lens for Nikon F-mount. This all-metal manual lens is an homage to Nikon's film lenses from the 1960s.
The Voigtlander Color-Skopar 28mm f/2.8 SL II S is described by Cosina as a wide-angle lens with sharp image quality from edge to edge. The focusing unit is equipped with a helicoid ring with a long extension which allows it to achieve a minimum focusing distance of 0.15 meters (about 5.9 inches). The lens features seven elements in six groups and uses one double-sided aspherical element.
As mentioned, the Voigtlander Color-Skopar 28mm f/2.8 features an all-metal body, focus ring, and aperture ring and includes a large carved finger grip in what Cosina describes as a "knurled" pattern made with precision cutting. this was done not only for the aforementioned nostalgia factor but also for the feeling it provides during manual operation.
As mentioned, the focusing mechanism is entirely manual. Cosina says that by adopting an all-metal helicoid unit that has been processed and adjusted with high precision and high-quality grease, the lens produces what it calls "appropriate torque." In short, focusing feels smooth yet firm and allows for precise adjustments.
Cosina says the lens is designed with nostalgia and functionality in mind, and the multicolored aperture stops and focus markers are akin to the film lenses designed by Nikon from the 1960s and 1970s. Cosina says that one aesthetic option is a tribute to the SLR interchangeable lenses that were produced by Nikon from 1965 through 1974 that feature a silver rim. Nicknamed "Sakishiro" and "Sakijiro" ("jiro" means black and "shiro" means white in Japanese), both are options for the color of the rim.
Cosina says that it works with a variety of Nikon bodies. It is compatible with Nikon Ai-S with a built-in CPU and also has an Ai coupler. The company says that this makes it possible to use with a variety of cameras from the old-fashioned film SLRs to the latest DSLRs.
Below are a few sample photos taken with the lens and provided by Cosina:
The Cosina Voigtlander Color-Skopar 28mm f/2.8 SL II S Aspherical lens is scheduled to be released in October in Japan for 65,000 yen (about $595) for either the black or silver-rimmed version. The optional lens hood will be sold separately for 5,000 yen (about $45). The company did not specify pricing or a release date for North America.
#equipment #news #aspherical #colorskopar #cosina #cosinavoigtlander #dslr #film #fmount #nostalgia #slr #throwback #voigtlander #voigtlander28mmf28sliis
Panasonic Unveils the Leica DG Vario-Summilux 25-50mm f/1.7 for M43
Panasonic has announced the Leica DG Vario-Summilux 25-50mm f/1.7 ASPH lens for Micro Four Thirds cameras that is able to boast a wide-open f/1.7 aperture through the entire zoom range and is designed to pair with the popular Vario-Summilux 10-25mm f/1.7 ASPH.
The lens was originally teased in May along with the development announcement for the GH6.
The Panasonic lenses that are branded "Leica" are manufactured by Panasonic but done so with oversight from Leica to assure high quality. The new Leica DG Vario-Summilux 25-50mm f/1.7 ASPH is constructed of 15 elements in 11 groups and -- as the lens's name suggests -- features an aspherical lens and three extra-low dispersion (ED)lenses that Panasonic says effectively suppress axial chromatic aberration and chromatic aberration of magnification. Spherical aberration and distortion are also corrected by the aspherical element which also allowed Panasonic the freedom to create a high-performant lens with a compact size and light weight.
The 25-50mm f/1.7 boasts a minimum focusing distance of 0.28 meters (about 11.2 inches) at the wide end and 0.31 meters (about 12.2 inches) at the telephoto end. The lens has a maximum magnification ratio of 0.42x (35mm camera equivalent) and features a dust and splash-resistant design that can resist temperatures down to 10 degrees below zero. The 25-50mm f/1.7 has a filter diameter of 77mm.
Panasonic says that the maximum 240 frames-per-second high-speed sensor drive allows the lens to realize high speed and high precision autofocusing, and in addition to an inner drive focus system, the lens's stepless aperture ring and "micro-step" drive in the aperture control system allow a connected camera to easily and smoothly shift to adjust for brightness changes when zooming or panning. The optical design also uses what is Panasonic calls barycentric stability to allow for minimal image shifting while zooming. The lens also has a focus ring that has a linear and non-linear setting that can be switched from the ring.
Together, the new 25-50mm f/1.7 and the 10-25mm f/1.7 cover a wide range from 10mm through 50mm at a wide-open f/1.7 and Panasonic says that the two lenses cover a focusing distance from wide-angle to telephoto, and can function as eight fixed focal length lenses (20mm, 24mm, 28mm, 35mm, 50mm, 75mm, 85mm, 100mm translated to 35mm camera equivalent). Panasonic argues that because of this versatility, the two lenses can offer the same or better level of performance than a set of prime lenses that cover the same range. The two lenses share a maximum aperture as well as a similar shape and functionality which the company says should enable creators the freedom to create with minimal workflow changes.
The Leica DG Vario-Summilux 25-50mm f/1.7 ASPH will retail for $1,800, is currently available for pre-order, and is expected to begin shipping in August.
#equipment #news #asph #aspherical #leica #leicadg2550mmf17 #leicadgvariosummilux2550f17 #leicavaeriosummilux1025f17 #lumix #microfourthirds #newlens #panasonic #panasonicleica #summilux #variosummilux #zoomlens
Leica Unveils the Vario-Elmarit-SL 24-70mm f/2.8 ASPH Lens
Leica has announced its version of the popular "desert island" lens in the Vario-Elmarit-SL 24-70mm f/2.8 ASPH, what it calls an "ideal lens with broad appeal," as it is capable across multiple disciplines from travel, studio, architecture, photojournalism, portraiture, and more.
Leica promises that this full-frame L-mount 24-70mm f/2.8 lens has "outstanding" optical performance, corrects for chromatic aberrations across the entire focal range, and will produce crisp photos regardless of where in the zoom range they are captured.
The lens is constructed of 19 elements in 15 groups and features three elements with aspherical surfaces on both sides for a total of six aspherical surfaces. It also features an 11-bladed aperture that the company says ceats a consistent circular bokeh that makes subjects stand out and "pop" from the background. The lens also has a short minimum focusing distance of 0.18 meters (~7.1 inches) at 24mm and 0.38 meters (~15 inches) at 70mm.
The lens is approximately 123mm (~4.8 inches) long, 88mm (~3.5 inches) in diameter, and weighs 856 grams (~30.2 ounces) without a lens hood, and grows to 153mm (~6 inches) long, 97mm (~3.8 inches) in diameter, and weighs 906 grams (~32 ounces) with a lens hood attached. Leica notes that this is not particularly large for a lens in this category and the compact nature is made possible by the omission of in-lens optical stabilization. Leica chose to do this because it could rely on it's own in-body image stabilization (IBIS) found in both the SL2 and Sl2-S and most other L-Mount full-frame cameras also feature IBIS.
The Vario-Elmarit-SL 24-70mm f/2.8 ASPH lens has an internal focusing system that Leica says is based on a single, lightweight lens element and utilizes a silent stepper motor to deliver what the company defines as "fast and precise" autofocus. Additionally, the lens's housing is made entirely of metal and is weather sealed, which the company says makes it durable in any environment and "ultimately making it suited for even the rigors of outdoor landscape and adventure photographers or the hustle and bustle of a pro wedding photographer."
Below is a set of samples image provided by Leica. Click each to see the full resolution.
With its launch, Leica is also announcing two new kit bundles for the SL2 and SL2-S that the company says comes at a "more approachable price when purchased as a set." The savings comes out to be $595 when either bundle is compared to a purchase of the lens and camera body separately.
The new Leica Vario-Elmarit-SL 24–70mm f/2.8 ASPH. is available to order today for $2,795. The SL2 and SL2-S camera bundles coupled with the new 24-70mm are priced at $8,795 and $7,195 respectively.
#equipment #news #2470mmf28 #aspherical #leica #leicalemount #leicalemountlens #leicalens #leicasl2 #leicasl2s #leicavarioelmaritsl2470mmf28asph #lmount #lmountalliance #newlens
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