Hasil Nikkor 50mm f1.2

Akhirnya kegalauan yang berlarut-larut ini berakhir sudah,
Lensa Nikkor 50mm f1.2 yang cukup terawat akhirnya menjadi hak milik.
Setelah di coba dipasang ke body Canon ternyata yang tertulis di beberapa artikel sebelumnya memang benar : lensa cepat dengan hasil cukup memuaskan – imho dan sepertinya ini akan jadi koleksi lensa 50mm manual yang Insya Alloh tetap dipertahankan

Ini salah satu hasil dari lensa Nikkor 50mm f1.2 :

1. Diafragma f1.2 (tajem dan bokeh luar biasa)

2. Diafragma f2 (paling tajam dengan bokeh menawan)

Kini waktunya bermain lebih kreatif voalaaa…. ­čśë

-salam-

Is Nikkon AIS lenses better than AI?

AI Lenses

In 1977 Nikon introduced AI or AUTO INDEXING meter coupled lenses. Changing AI lenses is much faster and less error prone than NAI lenses because the AI ridge automatically meter couples when the lens is mounted. A second small aperture row is for ADR (Aperture Direct Readout) which gives f/stop finder information on some bodies. MOST AI lenses have Nikon’s green multi-coating. Nikon maintained backward compatibility to previous Nikons by continuing the metering prong on the AI (and AIS) lenses. The prongs now have cut-outs in them to help illuminate the f/stop markings for ADR. The prongs were discontinued on AF lenses, but may be added.

AI lenses work on all 1977 and later manual focus Nikon bodies, as well as all but the low end AF SLRs. Depending upon the body, metering patterns available with AI lenses include Matrix, Centerweighted, and Spot. Three AF bodies offer NO metering with manual lenses, the NOT recommended N4004(F401) N4004s, and N5005.

As a side note, Nikon’s AI metering coupling looks suspiciously like Minolta’s older metering coupling used for MC and MD lenses since the excellent Minolta SRT 101.

Starting in about 1975 more and more Nikon lenses were produced with multi-coating. You can recognize this by the green colored lens coating.

AI’D Lenses

Nikon at one time offered a AI conversion for Nikon NON-AI in which a new aperture ring was installed with the AI metering ridge and the double row of f/stops (for ADR) and the new cutaway prong. Converted, they would work perfectly with the newer AI cameras of the time. Nikon converted lenses should be referred to as AI’d, even though most people mistake them for AI.

Nikon AI’d lenses have NO IDENTIFYING markings. In order to spot them, you simply have to know the older lens barrel styles. AI’d lenses are often bought and sold as AI because it is difficult to tell the difference. A good tip off can be the lack of multi-coating. If that “AI” lens doesn’t have the green color of Nikon’s multi-coating, it’s probably AI’d.

Nikon has discontinued AI conversions. Original Nikon AI conversion rings are VERY hard to find today. A few people still offer AI conversions. Such conversions are called “AI’d” lenses. Some do a great job, some are not so great. These conversions are easy to recognize because of the obvious machined groove at the back of the lens, and the lack of a Nikon style 2nd aperture row. For a user, the AI conversion makes the lens a LOT more serviceable. Be careful, however. Having this done to an early Nikon F lens will greatly decrease it’s value to the collector.

Another way to recognize AI’d Lenses is if they DON’T give you matrix metering on your FA or F4 like the AI or AIS lenses. Not many people noticed at the time, but AI lenses have lugs built into the back of them to give the meter extra information. These lugs were not added with Nikon’s AI conversion and are necessary for the matrix metering of the F4 or FA.

AI’d lenses SHOULD NOT be mounted on the Nikon 4004, 4004s or 5005. Due to the internal construction of these cameras, NAI and AI’d lenses may shear off internal meter contacts. Those cameras are Dogs anyway, UGH. The later N50 and N60, along with the APS Pronea, also do not tolerate NAI lenses.

AIS Lenses: A Technological Dead End

In 1981 Nikon introduced their AIS (AUTO INDEXING SHUTTER) lenses even though no Nikon could use AIS features until the FA in 1983. AIS lenses look a lot like AI lenses, but have their smallest F/stop marked in ORANGE.

AIS lenses also have 1) a little indentation in the stainless steel lens mount to indicate that a lens with a linear action diaphragm was mounted. This feature was originally used on the FA/FG/2020/2000. No current production Nikon camera uses this information. 2) internal modifications to allow AIS lenses faster and more accurate shutter priority and programmed exposures by way of linear aperture movement, i.e. an equal mount of movement anywhere along the linkage results in the same amount of diaphragm action.

Construction-wise, AIS lenses are usually smaller and lighter than their predecessors. In other words, costing cutting was coming home to Nikon. Most AIS lenses show cheapened construction. The typical five screws for the bayonet mount was reduced in most cases to only three. The traditional chrome ring on Nikon lenses between the focus ring and the aperture ring was replaced by aluminum.

IF the optical formula is the same–as they often are–I prefer the heavier constructed AI lenses over the AIS.

Is AIS Better than AI? Not often!

AIS lenses offer minor advantages on the Nikon FA, 2000, and 2020 ONLY, that’s it! On these THREE cameras, AIS lenses allow use of the “HI” program exposure, giving higher shutter speeds with lenses longer than 135 when the camera is set on PROGRAM. THAT’S IT FOLKS. Whoopdedoo. The later AF cameras usually replaced this feature with a program shift.

The current lineup of Nikon AF bodies makes NO distinctions between AI , AIS, or AI’d lenses in terms of features or metering options (the F4 did, but it’s discontinued).

Read it again, it’s important: The current lineup of Nikon AF bodies makes NO distinctions between AI , AIS, or AI’d lenses in terms of features or metering options(the F4 did, but it’s discontinued).

Some claim that AIS lenses are needed for program mode on the FA/FG/2020/2000. I don’t think so: it’s not what the instructions books say that I’ve read. They all will work with AI in program. Just set the lens to its smallest F stop and shoot.


If you plan to use manual lenses with current AF bodies, 
think twice before paying extra for AIS lenses. 
They seldom offer any benefit!


Source : https://www.cameraquest.com/aidaiais.htm

Radioactive lenses

General

There are a significant number of lenses produced from the 1940s through the 1970s that are measurably radioactive. Main source of radioactivity is the use of thorium oxide (up to 30% by weight) as a component of the glass used in the lens elements. Thorium oxide has a crystalline structural similar to calcium fluoride (fluorite). Like fluorite, its optical properties of high refractivity and low dispersion allows lens designers to minimize chromatic aberration and utilize lenses of lower curvature, which are less expensive to produce. Contrary to often seen statements to the otherwise, lenses containing lanthanum are not appreciably radioactive – lanthanum is only 1/10,000th as radioactive as thorium. Radioactivity in lanthanum containing lenses is due to the intentional inclusion of thorium in the optical glass mix. The presence of thorium can sometimes, depending on the mixture of other elements in the lens, cause moderate to severe browning of the lens element(s).

Radiation Levels

Typical radiation levels can approach 10 mR/hr as measured at the lens element’s surface, decreasing substantially with distance; at a distance of 3 ft. (.9 m.) the radiation level is difficult to detect over typical background levels. For reference, a typical chest x-ray consists of about about 10 mR, a round-trip cross country airline flight exposes a passenger to 5 mR, and a full set of dental x-rays exposes the patient to 10 mR to 40mR.

Most smaller lenses with thorium elements are not very dangerous. However, thorium eyepieces are dangerous. They can give a very large alpha and beta particle dose to the cornea of the eye, causing cataracts and other problems. Normally these particles are stopped by skin, but the surface of the eye is quickly damaged by them, and at close range, the dose can be very high.

Kodak Lenses

By far the most prolific producer of radioactive lenses was Eastman Kodak. From the 1940s through the 1960s, substantial numbers of amateur cameras were produced and sold with thoriated (containing thorium oxide) lenses, including some of the Pony, Signet, and high end Instamatic (e.g. 800 and 814, but not 100 or 124) cameras. In addition, many professional level Ektar lenses from this era contain thorium. Perhaps the most famous radioactive lenses of all were the Kodak Aero-Ektars.

Curiously, in his notable book, A History Of The Photographic Lens, Rudolf Kingslake (head of the Eastman Kodak lens design department 1937-1968), makes only a single passing comment on the possible use of thorium in Kodak lenses.

Lenses Tested Radioactive (by the author)

Lenses Reported Elsewhere As Radioactive

  • Bell & Howell Director Series (Model 1208?) XL Super 8 movie camera; Zoom Lens f: 1.2 F: 9-22.5 mm
  • Canon FL 58mm f/1.2
  • Canon FL 50mm f/1.8
  • FL 50/1.8 I (#58233): Up to 450 cpm / 26 ┬ÁSv/h at the back lens, up to 7 cpm / 0.4 ┬ÁSv/h behind camera or at the lens barrel.
    FL 58/1.2 (#25516, #44528): Up to 180 cpm / 10 ┬ÁSv/h at the back lens, up to 30 cpm / 1.7 ┬ÁSv/h behind camera or at the lens barrel.
  • Canon FD 17mm f/4
  • Canon FD 35mm f/2.0 (versions from the early 1970’s, concave)
  • Canon FD 55mm f/1.2 S.S.C. Aspherical (Measured at 46532 CPM @ front element )
  • Canon SUPER-CANOMATIC LENS R 50mm 1:1.8 No.78xxx
  • Carl Zeiss Jena Pancolar 55mm f1.4 (measured at 2360 nSv/h)
  • Carl Zeiss Jena Pancolar 50mm f1.8 "Zebra"
  • Carl Zeiss Jena Biometar 80mm f2.8 "Zebra" "(Only P6 mount version )
  • Carl Zeiss Jena Flektogon 50mm f4 "Zebra" "(Only P6 mount version )
  • Carl Zeiss Jena Flektogon 35mm f2.8
  • Carl Zeiss Jena Prakticar 50mm f1.4 (1st version with engravings around the outer side of barrel)
  • Focal (Kmart store brand) 35mm f/2.8
  • Fujica Fujinon 50mm f/1.4 non-EBC(Measured at 35137 CPM @ back element )
  • Fujica Fujinon 50mm f/1.4 EBC
    )
  • GAF Anscomatic 38mm f/2.8 (GAF Anscomatic 726 camera)
  • Industar 61 L/Z MC (L is for Lanthanum – radioactive element)
  • Kodak Aero-Ektars (various models)
  • Kodak Ektanon 4-inch Projection Lens f/3.5
  • Kodak Instamatic M24/26 Super 8 Camera
  • Konica Hexanon AR 50mm f1.4 (smallest aperture 16; green AE marking)
  • Konica Hexanon 57mm f1.2
  • Konica Hexanon 21mm f4 SN 7029XXX, primarily thorium and thorium decay products
  • Leica 50mm f/2 Collapsible Summicron
  • Mamiya/Sekor 55mm f/1.4 (m42, chrome+black, flat rear element) (Measured by specialists, 25th april 2014 @ Poissy, France: from 5 to 10 ┬ÁSV/h by direct touch & 1720 CPM).
  • Nikkor 35mm f/1.4 (early variant with thorium glass elements)
  • Olympus Zuiko MC Macro 20mm f/3.5 (http://www.flickr.com/photos/s58y/6802092736/)
  • Olympus Zuiko Auto-S 1:1,2/55 mm (first version with thorium glass elements)
  • Olympus Zuiko Auto-S 1:1,4/50 mm (only first version "Silvernose" is Radioactive)
  • Rikenon AUTO 55mm f/1.4 (22937 CPM rear element)
  • SMC Takumar 20mm f/4.5 (http://www.flickr.com/photos/s58y/6802092736/)
  • SMC Takumar 35mm f/2.0 (Asahi Optical Co.)
  • Super Takumar 35mm f/2.0 (Asahi Optical Co.)
  • SMC Takumar 50mm f/1.4 (Asahi Optical Co.)
  • Super Takumar 50mm f/1.4 (only the latest version with 7 elements)
  • SMC Macro Takumar 50mm f/4.0 (http://forum.mflenses.com/radioactivity-of-old-manual-lenses-t25714.html)
  • Super Takumar 55mm f/1.8 (Asahi Optical Co.)
  • SMC Takumar 55mm f/1.8 (Asahi Optical Co.)
    (not all)
  • Super Takumar 55mm f/2.0 (Asahi Optical Co.)
  • SMC Takumar 55mm f/2.0 (Asahi Optical Co.)
  • SMC Takumar 85mm f/1.8 (Asahi Optical Co.)
  • Super Takumar 6×7 105mm f2.4 (Asahi Optical Co.)
  • Steinheil Auto-Quinon 55mm f/1.9 KE mount
  • Topcor RE GN 50/1.4 (Lanthanum glass)
  • Topcor UV 50mm f/2
  • Yashinon-DS 50mm f1.4 (Yashica) (Measured at 680 nSv/h)
  • Yashinon-DS 50mm f1.7 (Yashica) (Measured at 762 nSv/h)
  • Yashinon-DX 50mm f/1.4 (Yashica) (Measured at 1359 nSv/h)
  • Yashinon-DX 50mm f/1.8 (Yashica)
  • Yashinon-DS-M 50mm f/1.4 (Yashica) (Measured at 572 nSv/h)
  • Yashinon-DS-M 50mm f/1.7 (Yashica) (Measured at 798 nSv/h)
  • Yashinon-DS-M 55mm f/1.2 (Yashica) (Measured at 1056 nSv/h)
  • Yashinon-ML 50mm f/1.7 (Yashica)
    (likely only the older design with ‘YASHICA LENS ML 50mm 1:1.7 YASHICA MADE IN JAPAN’ writings is radioactive)
  • Yashinon 55mm f1.2 (Tomioka) (also branded as Cosinon, Chinon, Tominon, Tomioka or Revuenon; Measured at 981 nSv/h)
  • Leitz Wetzlar Summicron 5cm f2 (M39)
  • Vivitar Series 1 28mm f1.9
  • Voigtlander 50mm Nokton Prominent
  • Zenitar-M 50mm f1.7 (Lanthanum glass)

Lenses with elements made of contaminated glass

Some lenses of the 1960s have elements made of glass sorts which include small traces of radioactive rare-earth elements. Sometimes this accidental radioactivity causes a significant yellowing of these lens elements. Some users of such lenses reported in camera blogs that they healed the yellowing by exposing these lenses to the ultraviolet light of the sun. The procedure needs several days of sunny weather to have a positive effect. Lens elements with such yellowing radioactive impurity are in the following lenses:

  • Minolta MC W. Rokkor-SI 1:2.5 28mm (early variant, before radioactive glass impurity could be banned)
  • Minolta MC Rokkor-PG 1:1.2 58mm (early variant, before radioactive glass impurity could be banned)

The healing of yellowing by sunlight is also reported for some lenses with thorium glass elements, for example for the Nikkor 35mm f/1.4 lens and the Super Takumar 50mm f/1.4 lens.

http://camerapedia.wikia.com/wiki/Radioactive_lenses