What is Petzval design?
The Petzval lens design dates from the 1840s and was the first fast portrait lens designed using mathematical calculations. Petzval-style lenses feature a sharp-focus central area, excellent contrast and color saturation, and swirly bokeh surrounding the center.
Which metal was the Petzval lens and many lenses from the 1800s?
Despite this, it typically retained the name “Petzval Portrait Lens”. The barrels of the lenses are made of brass, and you would often find two groups of doublet lenses with a gap in-between for the aperture.
Why was the Petzval lens such an advancement for photography?
The Petzval lens was known for delivering extreme sharpness in the centre, strong colour saturation, and a blurred effect in the out-of-focus area. Because of these characteristics, Petzval lenses were perfectly fit to produce portraits, especially when the photographer wanted the subject to be the centre of attention.
What is a Petzval telescope?
Petzval Telescopes are the highest end of refracting telescopes in terms of clarity. Because they use a 4 lens optical system they are exceptionally well corrected, they have very fast focal ratios, and they are the easiest to use of all astrographs in the world of astronomy.
Where are Lomography lenses made?
High Quality Glass Optics, Manufactured In Russia Together with Lomography, the lenses have been designed and constructed by a team of optics specialists at the Zenit factory in Russia. Zenit are master lens manufacturers and have the skill to build the New Petzval 85 Lens for use with today’s SLR cameras.
What is petzval surface?
The imaginary curved surface upon which images would be formed if curvature of field were the only aberration present. It is the curved surface in which the tangential and sagittal image shells of a point-focal lens coincide.
Who makes Askar telescopes?
Sharpstar Optics is a Chinese astronomy products manufacturer who has recently released a new line of telescopes. The new ASKAR FRA telescopes are what the company calls a “Flatfield Refractive Astrograph” which offers a Petzval design.
Who owns lomography?
Sally Bibawy and Matthias Fiegl, cofounders of Lomography, came of age as the world changed.
Is lomography a Russian company?
The company was founded in 1914 in Petrograd (now Saint Petersburg). It was established as a French – Russian limited company to produce lenses and cameras.
How do telecentric lenses work?
An image-space telecentric lens has the exit pupil at infinity and produces images of the same size regardless of the distance between the lens and the film or image sensor. This allows the lens to be focused to different distances without changing the size of the image.