Will x1.4 extender minimize megapixels on canon r6 camera with rf 100-400 is usm lens?

No. It will only extend the range of the lens by 1.4 times.

What kind of adapter is recommended for this??

There is no adapter needed. You must have a Canon EOS R, R5, or R6 camera to use it AND an RF lens. That is what the RF in the product description is all about. My experience with the EOS R5 and the RF 100-500 lens is that the 1.4 works beautifully.

Does anyone know how this will work on a sigma 18-300mm lens? i have a canon eos 90d.

No, this extender will not work with the 90D because it is for the EOS R bodies, like the R, RP, R10, R7, R6, R5 and R3. It is also only compatible with these select Canon RF lenses - RF600mm F11 IS STM, RF800mm F11 IS STM, RF100-500mm F4.5-7.1 L IS USM. In addition, The Sigma 18-300mm lens will not accept an extender on the rear mount because the rear element is not recessed.

I own the rf 2x. it's pretty good. any opinions on whether the 1.4 has image quality superiority enough for an amateur to justify the extra $500?

The only difference between the two I can think about is that the 1.5x allows for a little more light to pass though. While I have the 1.5x extender, I still haven't use it since I purchased it. You will have to consider the number of times you may attach the 1.5x to the lens instead of the 2x extender. Now, if the RF 100-500mm lens that I use would have a fixed aperture of f/4, then both the 1.5x and 2x extenders would be perfect.

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Canon EXT. RF1.4X(N) (4113C002)

Product ID: 218812311

Details

Brand
Canon
Camera Lens Description
Canon EXT.
Compatible Mountings
Canon RF
Focal Length Description
1.4x
Lens Type
Teleconverter

💧Dust & water resistant

🔍1.4x focal length boost

🔥Heat shield exterior

$1914.36

Duties & taxes included

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Sold byAmazon EcuadorDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

📸 Elevate your lens game — get closer, sharper, and unstoppable!

STAY COOL UNDER PRESSURE - Heat shield coating prevents overheating during intense shoots
SHARPER SHOTS EVERY TIME - High-refraction, low-dispersion glass minimizes chromatic aberration
BUILT TO BRAVE THE ELEMENTS - Durable dust- and water-resistant construction keeps you shooting anywhere
EXPAND YOUR REACH SEAMLESSLY - Smart-connect design for effortless attachment to select RF lenses
OPTIMIZED FOR PRO PERFORMANCE - Advanced coatings reduce ghosting for crystal-clear images

The Canon EXT. RF1.4X(N) extender boosts your RF lens focal length by 1.4x without sacrificing image quality. Engineered with premium low-dispersion glass and advanced coatings, it reduces chromatic aberration and ghosting. Its rugged, dust- and water-resistant design with heat shielding ensures reliable performance in demanding environments, making it a must-have for sports and wildlife photographers using Canon RF mount cameras.

Specifications

ASIN	B08C6Z348Z
Best Sellers Rank	#104 in Camera Lens Adapters & Converters
Brand	Canon
Built-In Media	Extender RF1.4x, Extender Cap RF, Lens Dust Cap RF, Lens Case LP811
Camera Lens	Canon EXT. RF1.4X(N) (4113C002)
Color	White
Compatible Camera Models	Canon EOS C70, Canon EOS R, Canon EOS R10, Canon EOS R100, Canon EOS R3, Canon EOS R5, Canon EOS R5 C, Canon EOS R50, Canon EOS R6, Canon EOS R6 Mark II, Canon EOS R7, Canon EOS R8, Canon EOS RA, Canon EOS RP
Compatible Camera Mount	Canon RF
Customer Reviews	4.8 4.8 out of 5 stars (182)
Exposure Control Type	Automatic
Focal Length Description	Magnification: 1.4x
Focus Type	Auto/Manual
Global Trade Identification Number	00013803330465
Image stabilization	Optical
Item Weight	222 g
Lens	Teleconverter
Lens Design	Prime
Lens Fixed Focal Length	1.4 millimeters
Lens Mount	Canon RF
Manufacturer	Canon USA
Manufacturer Part Number	4113C002
Maximum Focal Length	1.4 millimeters
Media Type	ProductImage
Minimum Focal Length	1.4 millimeters
Model Name	extender
Model Number	4113C002
Number of Items	1
Number of Packs	1
Real Angle Of View	71.43 degrees
UPC	013803330465
Unit Count	1 Count
Viewfinder Type	Electronic Viewfinder
Warranty Description	1 Year
Water Resistance Level	Water Resistant
Zoom Ratio	1.4:1

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