600mm L DO patented with 5.6 max. aperture

[xps]

Seen at: http://egami.blog.so-net.ne.jp/2015-12-18

shorter, no weight mentioned
for EF-M

 

[Maximilian]

Thanks for sharing, xps!

Did you recognize, that it's an EF-M (APS-C) patent?
I didn't look for translation but it seems that the
13.66 value is the image circle and the
299.25 could be the length of the optical formula with the lens itself even shorter of course.

I'd like to see the performance and price in RL of this one.

 

[Maximilian]

Now with some Google translation here:
http://www.cameraegg.org/eos-m-mirrorless-lens-patent-ef-m-600mm-f5-6-do-is/

Translated by Google:
Patent Publication No. 2015-215437
Published 2015.12.3
Filing date 2014.5.9

Example

• Focal length 585.00
• F-number 5.74
• Half angle (in degrees) 1.34
• Image height 13.66
• Overall length of the lens 299.25

 

[xps]

Thanks for sharing, xps!

Did you recognize, that it's an EF-M (APS-C) patent?
I didn't look for translation but it seems that the
13.66 value is the image circle and the
299.25 could be the length of the optical formula with the lens itself even shorter of course.

I'd like to see the performance and price in RL of this one.

Sorry Mr. Maximilian, I have forgotten to write this. Thats an cerebral effect from my resuscitation.

I heared from wildlife photographers some days ago (when I was allowed to test the "big whites") that Canon is planning to build an Semi/pro mirrorless body with well designed pro lenses. An hot discussion followed, if someone would use an ML body for wildlife...
But the rumorer seemed to be true that there are plans to compete Sony...

 

[mackguyver]

I can barely aim and track anything with the 200mm on my Eos M. At 600mm, this seems ridiculous. I assume this will promptly degrade into a discussion of how no one will buy the rumored Eos M4, let alone this lens, if it does not have a built-in EVF.

I was just about to mention the EVF - not really - but they will need to build a serious M body to go with this for sure. I ditched my M and switched to a SL1 when they released the M10 - I was tired of waiting for a semi-pro model - but I'd jump right back in if they released an M built like the 7DII with a 600 DO lens. This is likely a protective patent given Nikon's foray into the DO world, but maybe it will lead to something exciting one day.

 

[Quackator]

M4 or M Pro - who cares?

There will be a much more capable EOS M before Photokina 2016
the latest, and the viewfinder option for the M3 exists.

BUT!

This equates to 860 mm on full frame, with dramatically reduced
weight and girth while at the same time providing enough depth
of field for more of the complete birdie than just the tip of his pecker.

Also it will be much more cost effective in production because
the lenses can be so much smaller.

Getting rid of the back pain at a substantially lower price than
with the 4.0/600mm+1.4x Converter combo will be reason enough
for *every* birder out there to queue up for the next M and this lens.

While folks wait for lame things like a portrait prime or so,
Canon simply overruns a complete genre. Wow.

 

[wsmith96]

Personally, I would like to see Canon retain a native EF mount for their mirrorless future. I know there are reasons that a new mount would be better, but I'm going to be selfish and want to preserve my existing kit.

This is an interesting find. Thanks for sharing!

 

[Mt Spokane Photography]

Patents are for a optical formula, and they usually have multiple working models to demonstrate it. Picking out just one of those models (4) and then proclaiming that the patent is for that one alone is misleading at best.

The patent has five examples, but the formula can be used for almost any telephoto lens.

1.
Focal distance 390.97
F number 4.12
a half field angle (degree) -- 3.17
Image height 21.64
Whole length of the lens 255.66
BF 71.87

2.
Focal distance 392.00
F number 2.90
a half field angle (degree) -- 3.16
Image height 21.64
Whole length of the lens 337.95
BF 73.47

3.
Focal distance 391.00
F number 4.12
a half field angle (degree) -- 3.17
Image height 21.64
Whole length of the lens 255.66
BF 63.84

4.
Focal distance 585.00
F number 5.74
a half field angle (degree) -- 1.34
Image height 13.66
Whole length of the lens 299.25
BF 29.45

5.
Focal distance 786.20
F number 5.80
a half field angle (degree) -- 1.58
Image height 21.64
Whole length of the lens 485.25
BF 127.41

6.

 

[ahsanford]

Why EF-M + crop image circle for this?

If you are going to go crop-only, why lock out the 7D2 owners who would want this more, and more likely have the coin to pay for it?

- A

 

[Quackator]

It's not necessarily EF-M, can be EF-S as well
and work with the EF/EF-S to EF-M adapter.

But then...... EF-S might die in favor of EF (Full Frame)
and EF-M (APS-C). I don't see much future for lower
level DSLRs.

 

[ahsanford]

It's not necessarily EF-M, can be EF-S as well
and work with the EF/EF-S to EF-M adapter.

But then...... EF-S might die in favor of EF (Full Frame)
and EF-M (APS-C). I don't see much future for lower
level DSLRs.

In the bigger picture / longer term, mirrorless will absolutely take over, starting from the bottom price points and climbing up the SLR chain, I agree.

But that's not happening anytime soon. EF-S related products (i.e. Rebel SLRs) are the bread and butter of the company and continue to sell very well despite mirrorless competition. EF-S will be with us for quite some time.

- A

 

[ahsanford]

It's not necessarily EF-M, can be EF-S as well
and work with the EF/EF-S to EF-M adapter.

But then...... EF-S might die in favor of EF (Full Frame)
and EF-M (APS-C). I don't see much future for lower
level DSLRs.

Thanks for the clarification. So let me ask this: why would canon make a pricey 600mm prime sized/weighted just for crop? That's a birding/reach-loving shooter's dream, which Canon heretofore has never offered because they want those shooters buying the $10k+ superwhites.

So this is a candyland / fairy dust sort of patent in my eyes. I don't see this product ever being offered.

- A

 

[Mt Spokane Photography]

Notice there is a 800mm f/5.6 FF DO in there as well. Of the 5 examples, 4 are FF, one is APS-C

 

[NancyP]

FF 800 f/5.6 DO? intriguing. Fun with patents!

 

[Quackator]

So let me ask this: why would canon make a pricey 600mm prime sized/weighted just for crop?
That's a birding/reach-loving shooter's dream, which Canon heretofore has never offered because
they want those shooters buying the $10k+ superwhites.

Maybe they think that selling ten of those makes
more profit than selling one of the super whites?

Remember that nobody in the market would have
anything to compete......

Might well be decisive for Nikon birders to make
the switch. Or at least buy the lens and maybe
an EOS M3 plus EVF for starters. Or whatever the
current top m will be at release time of the lens.

Mind you: By the time this lens materializes, the
M3 will be well under 400 USD. That translates to
a pricey lenscap in relation to the lens. Peanuts.

 

[Maximilian]

The patent has five examples, but the formula can be used for almost any telephoto lens.
...

Thanks, Mt Spokane for pointing that out.

I came over this, too. But when I tried to get it straight I found different filing dates and also Nikon patents because I pushed the wrong lin, so it seems.
I am not so much into that patent reading thing, even more complex when displayed in foreign language, translated to English, which is still not my native language.

 

[Loswr]

It's not necessarily EF-M, can be EF-S as well
and work with the EF/EF-S to EF-M adapter.

I don't think a backfocus distance of <30mm is consistent with EF-S, it means the rear element would be extend 1.4 cm inside from the mount surface, plus additional distance for the structural parts of the lens holding the rear element (very few lenses have the rear element right at the back like the 85L).

This is almost certainly a design for an APS-C mirrorless body.

 

[JMZawodny]

I can barely aim and track anything with the 200mm on my Eos M. At 600mm, this seems ridiculous. I assume this will promptly degrade into a discussion of how no one will buy the rumored Eos M4, let alone this lens, if it does not have a built-in EVF.

I was just about to mention the EVF - not really - but they will need to build a serious M body to go with this for sure. I ditched my M and switched to a SL1 when they released the M10 - I was tired of waiting for a semi-pro model - but I'd jump right back in if they released an M built like the 7DII with a 600 DO lens. This is likely a protective patent given Nikon's foray into the DO world, but maybe it will lead to something exciting one day.

Not sure where my original post went. Glad you managed to preserve it before it mysteriously evaporated. I suspect you are correct about it being a protective move.

 

[Nininini]

But then...... EF-S might die in favor of EF (Full Frame)

The opposite is happening, crop outsells full frame 40 to 1. Full frame is still popular in studios, but for outside work and wlldlife.....nah, not many people want to carry around those bulky cameras anymore.

 

[Nininini]

why would canon make a pricey 600mm prime sized/weighted just for crop?

because most wildlife photographers are now shooting crop

they can't try to sell pricey full frame lenses anymore when the shooters themselves have already rejected the format

they will need to face the music and realize the market of bulky and weighty full frame DSLR is dying, and if they don't provide all the crop shooters with tele for wildlife, sigma, tamron and micro 4/3 will

Fuji said it better than me:

"We aimed for the system with the optimum balance of high image quality and compact lightweight body that professionals can use. With that idea in mind, we came to the conclusion that APS-C is the way to go as opposed to full frame"