Archive for: lens

Patent: Tamron 150-600 f/5-6.3

Patent: Tamron 150-600 f/5-6.3

A new Supertelephoto Zoom?
This is definitely a lens that Tamron would make. If you need length and you’re on a budget, this could be a one of a kind option if and when it comes to market.

Patent Publication No. 2012-208434

  • Release Date 2012.10.25
  • Filing date 2011.3.30

Example 1

  • Focal length f = 152.3068-582.0002mm
  • FNo. = 5.12-6.45
  • 2ω = 16.30-4.23 ° angle of view
  • 18 sheets 13 groups lens configuration
  • 5-group configuration of positive and negative positive negative
  • Inner Focus (the fourth group focus group)
  • Stabilizer (front group of the fifth group of anti-vibration group)
  • Reduce the size of the group of anti-vibration and focus group
  • To shorten the focal length of the front group of the fifth group, reduce the amount of movement of the time the anti-vibration
  • Joining the front group lens and the fifth group, when the spherical aberration correction of the anti-vibration, axial chromatic aberration and chromatic aberration of magnification

Source: [EG]

cr

Canon EF 600 f/4L IS II in the Wild

Canon EF 600 f/4L IS II in the Wild

They’re out there
We’ve been told by a couple of places, that the new EF 600 f/4L IS II is out there. Loaner copies of the lens have been sent to various manufacturers of accessories for measurement and that sort of thing. Multiple reports say they are fully functional production versions of the lens.

Lots of initial praise for the lens, especially how light it feels in comparison to the first IS version.

A very good sign indeed.

cr

Canon 18-45 f/3.5-5.6 Kit Lens for APS-C Mirrorless Patent

Canon 18-45 f/3.5-5.6 Kit Lens for APS-C Mirrorless Patent

Canon Mirrorless Fun
A patent showing  an 18-45 f/3.5-5.6 kit lens for an APS-C sensored mirrorless camera has appeared. That would be a 29mm-70mm lens when crop is factored in.

Source: [EG]

cr

New Lens on December 6, 2011? [CR1]

New Lens on December 6, 2011? [CR1]

New Lens(es)?
Are we getting a goodie before Christmas?

Received an email today saying Canon may announce a new lens on or around December 6, 2011.

This could just be in retaliation of the suspected Nikon announcements on November 30, 2011. No mention of what lens, which lowers the possibility in my eyes.

I can only think of one time a lens was announced and I had heard absolutely nothing about it, and that was the 55-250 II.

cr

New Article – Lens Genealogy

New Article – Lens Genealogy

Lens Genealogy
Ever wondered how a lens is designed, where it comes from or why things are done the way they are? This new article from Lensrentals.com’s Roger Cicala may answer some of those questions.

It’s a great article and well worth the read, just have some time for it.

I knew that today’s lenses are all designed using computer programs, but I was surprised to find new lenses aren’t designed from scratch. Designers start with an existing lens design and modify it. Of course, a lens designer doesn’t say “this lens really sucks, let’s use it as our starting point”. They start with a good design and try to improve it.

Read the article | Visit LensRentals.com

c

New Canon Lenses Availability – Updated

New Canon Lenses Availability – Updated

Updated – May 25, 2011 @ 9:00PM EST
Canon added dates of December 2011 for the 500 f/4L IS II and 600 f/4L IS II.

thanks Paolo

Update to sales start for EF 300mm f/2.8L IS II USM, EF 400mm f/2.8L IS II USM, EF 8-15mm f/4L Fisheye USM, EF 500mm f/4L IS II USM and EF 600mm f/4L IS II USM lenses
London, UK, 25th May 2011 – Following the announcement of delays to the sales start to the following lenses : EF 300mm f/2.8L IS II USM, EF 400mm f/2.8L IS II USM, EF 8-15mm f/4L Fisheye USM, EF 500mm f/4L IS II USM and EF 600mm f/4L IS II USM, Canon can now provide an update on the planned start dates for these lenses:

  • EF 300mm f/2.8L IS II USM Late August, 2011
  • EF 400mm f/2.8L IS II USM Late August, 2011
  • EF 8-15mm f/4L Fisheye USM Late July, 2011
  • EF 500mm f/4L IS II USM December 2011*
  • EF 600mm f/4L IS II USM December 2011*

Canon would like to apologise to any customers who have been inconvenienced by these delays.

*Any sales start dates will be communicated as soon as they become available.

[source] thanks Eyal

cr

Patent – EF 35 f/1.4L II

EF 35 f/1.4L II

Canon files patent for EF 35 f/1.4L II

  • Patent Publication No. US 7,944,625
  • Published 2011.5.17
  • Filled 2009.8.5

Specifications

  • Focal Distance: 34.59
  • Fno: 1.45
  • Half angle of view: 32.02
  • Image Height: 21.64
  • Lens Length (mm): 126.93
  • Back Focus (mm): 37.98

This is definitely a lens the Canon world wants to see. How do you improve a classic? I’m sure they’ll find a way.

thanks George

cr

Canon EF 35 f/1.4L $1469.00 at B&H

Patent – EF 300 f/4L IS II

EF 300 f/4L IS II

Canon patent for EF 300 f/4L IS II

  • Patent Publication No. 2011-70032
  • Published 2011.4.7
  • Filled 2009.9.25

Specifications

  • Focal Distance: 294
  • Fno: 4.14
  • Half angle of view:4.08
  • Image Height: 21.64
  • Lens Length (mm): 225
  • Back Focus (mm): 83.12
  • Aspherical: 1

Needed? Not really. However the 300 f/4L IS is a great performer and a decent seller for Canon. Adding updated IS to the lens would make most buyers very happy. Not sure it would be upgrade worthy.

cr

Canon EF 300 f/4L IS $1399 at B&H


Patent – EF 24 f/2.8

EF 24 f/2.8

Canon patent for EF 24 f/2.8 USM

  • Patent Publication No. 2011-70032
  • Published 2011.4.7
  • Filled 2009.9.25

Specifications

  • Focal Distance: 24.48
  • Fno: 2.86
  • Half angle of view:38.26
  • Image Height: 21.64
  • Lens Length (mm): 92
  • Back Focus (mm): 38.00
  • Aspherical: 0

This patent is a bit confusing to me. Not sure I see the point of such a lens. Unless Canon is revamping all their affordable primes.

cr


Patent – EF 28 f/1.8 DO & Others

EF 28 f/1.8 DO

Canon files patent for new DO lenses

  • Patent publication 2009-198960
  • Published 03/09/2009
  • Filing date 2008/02/25

Example 1

  • Focal length f = 27.14mm
  • Fno = 1.85
  • Angle of 77.1 °

Example 2

  • Focal length f = 24.50mm
  • Fno = 1.45
  • Angle of 82.9 °

Example 3

  • Focal length f = 25.00mm
  • Fno = 1.45
  • Angle of 81.8 °

Example 4

  • Focal length f = 24.33-36.50-47.00mm
  • Fno = 3.4-4.0-4.7
  • 83.3-61.3-49.4 ° angle

Example 5

  • Focal length f = 26.00-39.00-50.23mm
  • Fno = 3.4-4.0-4.7
  • 79.5-58.0-46.6 ° angle

Information

  • General retrofocus
  • In general SLR wide angle lens
  • Many chromatic aberration
  • Using high-dispersion glass, as excessive compensation around
  • General diffractive optics
  • Can correct chromatic aberrations
  • Where it is difficult to use
  • Manufacturing difficulties
  • Aberration can not fine-lattice

Patented Features

  • Adopted retrofocus
  • Chromatic aberration correction over the entire
  • Diffractive optical elements, aspherical and low dispersion, employing anomalous dispersion lens
  • The lenses focus mechanism
  • Front lens is fixed
  • Second lens to focus
  • Floating mechanism
  • The optical system of patents
  • Lateral chromatic aberration to occur around the first lens
  • Not easily corrected by increasing the number of lenses
  • Diffractive optics correction to put the image side than the diaphragm
  • Only increase the power of the diffractive optical element
  • Chromatic aberration correction using a bonded lens

This is an older patent application, but I think it’s still important to see diffractive optics are not dead within Canon R&D.

cr