What is super Takumar?
The Super Takumar is a 50mm f1. 4 lens that was released by the Asahi Optical Co. in the 1960s. It has garnered something of a legendary reputation online, and is known for its sharpness, bokeh, and propensity for flare.
What color glass is radioactive?
Yes, canary glass, uranium glass, or Vaseline glass, as it became known in the early 20th century for its similar color to petroleum jelly, emits radiation, but the amounts are tiny, infinitesimal, ridiculously small.
Are old camera lenses radioactive?
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.
Are modern lenses radioactive?
Some lenses produced from the 1940s through the 1970s were treated with radioactive thorium oxide to curb chromatic aberration. But as Andrew Walker explains in this 7.5-minute video, modern digital cameras can actually “see” that radiation as image noise that has the potential ruin your long exposures.23 Feb 2021
Are Pentax lenses radioactive?
There are a significant number of lenses produced between 1940 and 1970 that are measurably radioactive, like the Pentax SMC Takumar 50mmf/1.4 lens Walker shows in the video above. Thorium Oxide is the main culprit of this radioactivity and was applied to glass elements because of its crystalline structure.23 Feb 2021
Are glasses radioactive?
As consumer product, glass lenses may contain trace quantities of uranium, thorium and potassium. Glass lenses under investigation were monitored for the detection of gamma rays and beta particles using radiation measuring devices. Using high purity germanium detector radioactivity concentration was estimated in Bq/kg.15 Nov 2006
Does glass have radiation?
Yes, canary glass, uranium glass, or Vaseline glass, as it became known in the early 20th century for its similar color to petroleum jelly, emits radiation, but the amounts are tiny, infinitesimal, ridiculously small.30 Jul 2014
Why was thorium used in lenses?
Since this reduces the necessary curvature of the glass, the lens can be made thinner and lighter. Unfortunately, glass with a high refractive index can also have a high dispersion. By adding thorium to the glass, a high refractive index (over 1.6) can be achieved while maintaining a low dispersion.
How can you tell if glasses are radioactive?
Perhaps the most reliable way to identify the presence of uranium in the glass is to expose it in the dark to a source of ultraviolet light (e.g., a black light). If the glass glows a rich green color, it contains uranium.
Are Nikkor lenses radioactive?
The Super-Takumar 55mm f/1.8 is one example, it is possible to bleach properly as-is. The Nikkor-N 35mm f/1.4 Auto has to be dismantled to get best results because of its radioactive-glass being situated deep-inside the lens.30 May 2021
Is it safe to use radioactive glass in a camera?
According to the research (below), radioactive lenses are relatively safe. We are regularly exposed to radiation from various sources every day, which combined give a more significant dose than the use of radioactive lenses would: Walking around outside in the sun (main contribution to the annual radiation dose)2 Feb 2021
Are Pentax K mount lenses radioactive?
the “hot” lenses are only weakly to moderately radioactive. In particular: mounting them on digital cameras (Sony Alpha 7RII, Pentax K-1) blocks most of the radiation or entirely, while old film cameras (Pentax Spotmatic SP) usually block a significant amount.
When did they stop using thorium in lenses?
These lenses have been employed in a variety of applications including television cameras, 35 mm cameras, military optics, microfilm readers and aerial cameras. The production of such lenses seems to have ended in the late 1980s.
Are thorium camera lenses safe?
Most smaller lenses with thorium elements pose a negligible risk to human health. However, thoriated glass eyepieces are significantly more dangerous. They can give a very large alpha and beta particle dose to the cornea of the eye, potentially causing cataracts and other problems.
What are radioactive lenses?
Lenses with elements made of radioisotope-containing glass Some lenses of the 1960s, such as early Minolta Rokkor lenses, have elements to made of glass formulas which include small traces of radioactive rare-earth elements. Sometimes this incidental radioactivity causes a significant browning of these lens elements.
What mount is super Takumar?