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Patent: Canon 400mm f/5.6 Mirror (Catadioptric) Lens

Patent: Canon 400mm f/5.6 Mirror (Catadioptric) Lens

By Canon Rumors | December 14, 2017 | Canon Patents

A patent application showing a new mirror lens design from Canon is confusing to say the least. I figured the days of the catadioptric lens were well behind us, but here we are.

Specification from the patent:

  • Focal length: 400mm
  • Aperture: f/5.6
  • 2 ω: 1.96
  • Image height: 13.66mm
  • Back focus: 33.07mm
  • Lens length: 247.73mm

The image above from Northlight shows in blue where the mirrors are in the lens.

The blue bits are mirrors. The light comes in through L1, bounces off M1/M2 and through a hole in M1 back to the camera.

You can view the patent at the Japanese Patent Office here.

Patent: Autofocus Related Patent Applications from Canon

Patent: Autofocus Related Patent Applications from Canon

By Canon Rumors | December 14, 2017 | Canon Patents

For the folks that love reading/translating patents, here are three new ones uncovered by Northlight that are related to autofocus technologies.

Summarized by Northlight:

  • [USPTO] Refining AF to correct for lens chromatic aberration.
  • [USPTO] Using AF to refine and maintain manual focus setting
  • [USPTO] Improving focus accuracy and automating focus adjustment over the range of lens settings

Additionally, here are some patent applications related to image files

  • [USPTO] looks at ways of reducing moire in images by detecting it for correction in processing.
  • [USPTO] looks at lossy RAW encoding for faster burst mode shooting
Review: Canon PowerShot G9 X Mark II by DPReview

Review: Canon PowerShot G9 X Mark II by DPReview

By Canon Rumors | December 14, 2017 | Canon Reviews

DPReview has completed their review of the Canon PowerShot G9 X Mark II, Canon’s smallest 1″ sensor camera. The camera appears to be a bit of a mixed bag, as the user experience is quite good, but the camera is let down by a soft lens and poor battery life.

I looked long and hard at the PowerShot G9 X Mark II for my son, but I decided that the PowerShot G7 X Mark II was well worth the additional dollars.

From DPReview:

The PowerShot G9 X II is very appealing: it’s as small a traditionally styled camera with a 1″ sensor as you’ll find and its touch interface makes it easy to pick up and use. It has a broad feature set, generally responsive performance and shooting modes for both beginners and more advanced users.

As you’ve probably gathered by now, the G9 X II is let down by its lens, JPEG processing and battery life that requires buying at least one spare. If you’re set on a Canon, moving up to the PowerShot G7 X II is a smart idea, assuming that you have an extra $200 available. The Sony RX100 and RX100 II are also worth consideration, though we think that Canon offers a better user experience. Read the full review

PowerShot G9 X Mark II $429 | PowerShot G7 X Mark II $649 at B&H Photo

Review: Irix Firefly 15mm f/2.4 by Northlight

Review: Irix Firefly 15mm f/2.4 by Northlight

By Canon Rumors | December 13, 2017 | Third Party Lenses

Keith over at Northlight Images has completed his extensive review of the Irix Firefly 15mm f/2.4 lens. We seem to have an abundance of fast ultrawide lenses to choose from now. Canon, Sigma, Rokinon, Zeiss and now IRIX all offer competent lenses at different price points.

The Firefly version of this lens has a lower build quality than the Irix Blackstone 15mm f/2.4, which Keith touches on.

From Northlight

Optical performance is crisp and with good detail once you stop down a bit. My rough and ready testing suggests that on my 5Ds, f/6.3 or 7.1 give the best overall performance. That said if it’s a central subject the f/2.4 setting restricts DOF enough to soften the background for closer subjects. The amount of coma at the widest aperture may be an annoyance for astro photography, but it’s on a par with many other wide lenses I’ve looked at.

If you’re not used to it, then manual focus definitely will take some getting used to, but after a while you rarely need to give it too much thought.  Modern DSLR viewfinder focus screens are pretty poor for manual focus, so even with a focus confirm indication, your distance estimating skills will improve too. Read the full review

Irix lenses are available at B&H Photo

Get a Free Week on Your Rental Over the Holidays From Lensrentals.com

Get a Free Week on Your Rental Over the Holidays From Lensrentals.com

By Canon Rumors | December 12, 2017 | Deals on Gear

You can get a free week on your rental from Lensrentals.com by using the coupon code EXTRAWEEK.

How it works:

  1. You rental must arrive before December 22, 2017
  2. Your rental must have a return date after January 1, 2018.
  3. Use coupon code EXTRAWEEK to get December 26, 2017 – January 1, 2018 free

Visit Lensrentals.com