Canon Patent: In Camera Built-in Neutral Density Filter

Canon Patent
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That’s an interesting Canon patent that was spotted in japan: a built-in ND (Neutral density) filter.

Canon patent application 2023128236 (Japan, published 9/14/2023) discusses methods and technology for an ND filter that is built-in on the camera body.

Excerpts from the patent literature:

An object of the present invention is to provide an imaging device in which an optical filter can be easily switched between a used state and a non-used state, and can appropriately control foreign matter removal from the surface of an imaging unit.

BACKGROUND ART

Conventionally, imaging devices capable of capturing images using optical filters such as neutral density filters (ND filters) have been known. Patent Document 1 discloses an imaging device that includes a plurality of ND filters and can move up and down. Patent Document 2 discloses a configuration including a through hole for blowing gas to blow away dust attached to the ND filter.

In the configuration disclosed in Patent Document 1, it is difficult to hermetically seal the ND filter and the imaging device, so there is a possibility that dust and the like may enter the interior of the imaging device. Although the configuration disclosed in Patent Document 2 can remove dust etc. attached to the ND filter, it is not possible to properly control the function of removing dust etc. attached to the surface of the image sensor unit, so that the captured image may not be affected. Dust, etc. may be reflected.

Therefore, it is an object of the present invention to provide an imaging device in which it is possible to easily switch between a state in which an optical filter is used and a state in which it is not in use, and in which foreign matter removal from the surface of an imaging unit can be properly controlled. purpose.

Effects of the Invention

According to the present invention, an image pickup device in which it is possible to easily switch between the use state and the non-use state of the optical filter, and it is possible to properly control foreign matter removal from the surface of the imaging unit. equipment can be provided.

More Canon patents are listed here.

[via asobinet]

Today Only: NiSi 72mm Natural Night Filter – $59.99 (reg. $149.99)

NiSi 72mm
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Only for today (8/5/2022) B&H Photo has a 60% discount on the NiSi 72mm Natural Night Filter.

At a glance:

  • Reduces Light Pollution in Night Sky
  • Blocks Yellow Sodium-Vapor Light
  • Blocks Yellow Mercury-Vapor Light
  • Blocks Yellow Light from Low CRI LEDs
  • 2x Filter Factor, 1-Stop Correction
  • H-K9L Optical Glass Construction
  • Nano Coating and Resistance Coating
  • Aluminum-Alloy Filter Ring
  • 72mm Front Filter Threads
  • Plastic Case

Get the NiSi 72mm Natural Night Filter on sale at $59.99. Compare at $149.99.

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Today Only: Save Up To 50% On Tiffen Variable Neutral Density Filter

Tiffen Variable Neutral
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Only for today (9/2/21) B&H Photo offers up to 50% discount on Tiffen variable neutral density filters.

At a glance:

  • Provides 2 to 8 Stops of Light Control
  • Rotating Ring to Choose Degree of ND
  • Eliminates Buying Many ND Filters
  • Use to Create Blurs/Special Effects
  • Use with Film or Digital
  • Wide Outer Ring Reduces Vignetting
  • Black Aluminum Filter Ring
  • ColorCore Glass
  • Made in the USA

Three Tiffen filters are discounted. You can save additional $20 if you apply for the mail-in rebate:

Get the SanDisk 128GB Extreme PRO UHS-II SDXC memory card on sale at $149.95. Compare at $199.95. A $50 discount is applied in cart.

Hand-picked deals are listed here.

Deal pages:

Refurbished lenses and DSLRs at Canon Store (best deals might be found here)

Save $10 on Luminar 4 and/or Aurora HDR 2019 using our code “WATCH” at checkout.

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Aurora Aperture Introduces Revolutionary Filter System For Mirrorless Mount Adapters

Aurora Aperture
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Press release:

AURORA APERTURE INTRODUCES A REVOLUTIONARY FILTER SYSTEM: ADAPTER MOUNT FORMAT FILTERS FOR MIRRORLESS MOUNT ADAPTERS

Irvine, California, July 15th, 2019 – Aurora Aperture Inc. today has introduced a revolutionary filter system, the Aurora Aperture Adapter Mount Format (AMF) filter for mirrorless mount adapters. 

The AMF filters drop into mirrorless camera mount adapters such as the Canon Mount Adapter EF-EOS R, the Nikon FTZ, the Sigma MC-11 for Sony E, and the Sigma MC-21 for the L mount.

“In 2017 we introduced a rear mount filter system for the Canon EF 11-24mm F4L USM: The Aurora CR format, an industry-first rear mount glass filter,” said Jeff Chen, founder and CEO of Aurora Aperture Inc. “The Aurora Aperture CR format filters solves the problem of needing a huge filter adapter and massive filters for lenses that have protruding front elements. Due to the recent pivot of mirrorless camera development and releases from Canon, Nikon, Panasonic, Sony, and others: We’ve invented the Adapter Mount Format for the mirrorless mount adapters which enables mirrorless camera users to use a single set of filters for all their DSLR lenses regardless of the filter thread size.”

One Mount One Filter

Designed in California, the Aurora Aperture AMF drop-in filters offer many advantages over traditional front–mounted lens filters. Since a drop-in filter goes inside a mount adapter, users only need one set of filters per adapter instead of specific thread sizes for each lens. It not only saves users from having to buy multiple sets of filters or large diameter filters – but it also means awkward to use step-up rings are no longer necessary.

The drop-in filters are very compact and lightweight, meaning that they’re easily carried. They cost much less than traditional front mount filters, especially in comparison to large filter thread sizes.

Any DSLR lens that can be mounted on the four supported mirrorless mount adapters can be used with these drop-in filters, whether the lens has a front filter thread or not. This is especially beneficial for ultra wide-angle lenses without a front filter thread which would otherwise require massive filters on a bulky adapter.

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Deal: Tiffen 77mm & 82mm Variable Neutral Density Filter – $49.95/$69.95 (reg. $129.95/$173.95)

Variable Neutral Density Filter
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Tiffen Variable Neutral Density filters at a glance:

  • Provides 2 to 8 Stops of Light Control
  • Rotating Ring to Choose Degree of ND
  • Eliminates Buying Many ND Filters
  • Use to Create Blurs/Special Effects
  • Use with Film or Digital
  • Wide Outer Ring Reduces Vignetting
  • Black Aluminum Filter Ring
  • ColorCore Glass
  • Made in the USA

B&H Photo has discounts on Tiffen Variable Neutral Density filters (exp. 6/20/19).

B&H Photo has the 3 days long Mega Deal Zone event going on. Choose from almost 500 selected deals.

Some noteworthy Kickstarter projects:

  1. DUO Daypack, quick access camera bag with lifetime warranty
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Deal: Tiffen 77/82mm Variable Neutral Density Filter – $69.95/$89.95 (reg. $129.95/$173.95, today only)

Variable Neutral Density Filter
View Post

Tiffen Variable Neutral Density Filter at a glance:

  • Provides 2 to 8 Stops of Light Control
  • Rotating Ring to Choose Degree of ND
  • Eliminates Buying Many ND Filters
  • Use to Create Blurs/Special Effects
  • Use with Film or Digital
  • Wide Outer Ring Reduces Vignetting
  • Black Aluminum Filter Ring
  • ColorCore Glass
  • Made in the USA

Only for today (4/8/19) B&H Photo offer substantial discounts on two Tiffen Variable Neutral Density Filter. Moreover, you get an additional $20 mail-in rebate (instructions)

  • Tiffen 77mm Variable Neutral Density Filter on sale at $69.95 ($49.95 after MIR). Compare at $129.95.
  • Tiffen 82mm Variable Neutral Density Filter on sale at $89.95 ($69.95 after MIR). Compare at $173.95.

More selected deals:

More hand-picked deals are listed here.

Authorised Canon retailer B&H Photo has discounted EOS 5D Mark IV and EOS 6D Mark II bundles on offer for the holidays.

We offer 10% discount to subscriptions to Pixpa all-in-one platform for photographers.

Today’s Gold Box and one day only deals at Amazon US, Amazon DE, Amazon UK, B&H Photo, eBay, Adorama.

Canon Europe stores have a cash back promotions going on:

Refurbished lenses and DSLRs at Canon Store (best deals to be found here)

Save $10 on Luminar 4 and/or Aurora HDR 2019 using our code “WATCH” at checkout.