Canon Patents

Patent: Canon RF 28mm f/1.8 & RF 50mm f/1.8

Canon Rumors
Posted onApr 18, 2019 at 8:28 AM
Updated onUpdated on Apr 18, 2019 at 8:30 AM

The Canon RF lens lineup will obviously include more affordable non-L options, and this patent shows Canon is working on such optical formulas.

The back focus on the RF 28mm f/1.8 is really short, which is quite interesting.

Canon RF 28mm f/1.8

  • Focal length: 28.80mm
  • F-number: 1.85
  • Half angle of view: 36.91°
  • Image height: 21.64mm
  • Total lens length: 80.30mm
  • BF: 7.00mm

Canon RF 50mm f/1.8

  • Focal length: 48.50mm
  • F-number: 1.85
  • Half angle of view: 24.04°
  • Image height: 21.64mm
  • Total lens length: 95.00mm
  • BF: 15.80mm

We had previously reported on the possibility of an RF 50mm f/1.8 IS coming sometime in 2019. With the coming IBIS in Canon mirrorless cameras, we may not see IS in these types of lenses to reduce size and weight.

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Josh Leavitt

Josh Leavitt

EOS T7i
Aug 19, 2018
86
100
Those will be nice additions to the RF lineup. But I'm hopeful Canon will give us some pancake RF primes eventually. I'd like to see RF versions of the 24mm F/2.8 STM and 40mm F/2.8 STM. I think those along with the upcoming RF 70-200 F/2.8 and an EOS RP would make a perfect light and small travel kit.
 
Reactions: SwissFrank
R

rrcphoto

EOS 5D MK IV
Jun 20, 2013
2,505
147
Josh Leavitt said:
Those will be nice additions to the RF lineup. But I'm hopeful Canon will give us some pancake RF primes eventually. I'd like to see RF versions of the 24mm F/2.8 STM and 40mm F/2.8 STM. I think those along with the upcoming RF 70-200 F/2.8 and an EOS RP would make a perfect light and small travel kit.
Click to expand...
24mm may come, but the 40mm will never come for the RF mount.
 
Maximilian

Maximilian

The dark side - I've been there
Nov 7, 2013
2,407
219
Germany
R series starts to become more and more interesting :)

But when you look at the lens length (incl. 20 mm flange) they are not really small.
Seems Canon takes IQ over size.
 
G

Groundhog

I'm New Here
Aug 23, 2014
12
1
LSXPhotog said:
A walk around 50mm RF lens....I hope they target sub $250 with it being a 1.8.
Click to expand...
I think there will be a nifty fifty for the RF mount for well under $150 - just like the EF version it will be the inexpesive start for many to shoot with fast primes.
 
J

jonebize

I'm New Here
Dec 15, 2018
17
14
Groundhog said:
I think there will be a nifty fifty for the RF mount for well under $150 - just like the EF version it will be the inexpesive start for many to shoot with fast primes.
Click to expand...
With a 35mm sibling, the pair would be a powerful tool in the market
 
Last edited:
D

degos

EOS 80D
Mar 20, 2015
152
88
Groundhog said:
I think there will be a nifty fifty for the RF mount for well under $150 - just like the EF version it will be the inexpesive start for many to shoot with fast primes.
Click to expand...
Nah, Canon's whole philosophy with RF is to net big juicy margins. Big lenses, big prices, big executive smiles.

EOS M will be the bone thrown to 'enthusiasts' who don't have $1200 to spend on a lens. Go play in the corner with this little toy camera until you earn a decent salary - that's Canon's attitude.

I just hope that Tamron moves into the RF space and starts filling-out the affordable range.
 
canonnews

canonnews

EOS RP
Dec 27, 2017
220
102
Canada
www.canonnews.com
Groundhog said:
I think there will be a nifty fifty for the RF mount for well under $150 - just like the EF version it will be the inexpesive start for many to shoot with fast primes.
Click to expand...
the optics for the 50mm are very similar to that of the RF 35mm. it's most likely going to be, like the 35mm a $500 lens, not a well under $150 one.

also, I made mention of this in our posting on this patent, but it deserves to be mentioned here. as this is the patent application for the RF 35mm 1.8 IS STM, and it does contain a IS element, all these patent embodiments contain the same or similar IS compensation element meaning they probably all have IS.
 
Reactions: Aaron D
Sharlin

Sharlin

EOS 6D MK II
Dec 26, 2015
805
164
Turku, Finland
Etienne said:
The Canon 50 f/1.4 is listed at 2 inches long, or 50.8 mm
Click to expand...
The emphasis was on when you include backfocus distance. That 95mm in the patent, like always in patents on optical designs, is measured as the distance from the front element to the image plane. The total length of the EF 50/1.4 is ~95mm when you include the 44mm flange distance of the EF mount. The physical length of this RF lens is about 2cm longer than the EF one, pretty much exactly negating the difference in flange distance (which is 20mm in the RF case). This is likely not a coincidence.
 
Reactions: SwissFrank
E

Etienne

EOS 6D MK II
Sep 19, 2010
1,319
108
Ottawa Ontario
Sharlin said:
The emphasis was on when you include backfocus distance. That 95mm in the patent, like always in patents on optical designs, is measured as the distance from the front element to the image plane. The total length of the EF 50/1.4 is ~95mm when you include the 44mm flange distance of the EF mount. The physical length of this RF lens is about 2cm longer than the EF one, pretty much exactly negating the difference in flange distance (which is 20mm in the RF case). This is likely not a coincidence.
Click to expand...
It doesn't negate anything. This lens is nearly twice as long, completely the opposite direction hoped-for with mirrorless tech. And it is not technically necessary as evidenced by the RF 35 f/ 1.8 IS which is slightly faster, includes near macro focusing and is about the same length as its Ef 35 f/2 IS equivalent. So, it is huge for a 50 f/1.8
 
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