Home · Register · Join Upload & Sell

Moderated by: Fred Miranda
Username  

  New fredmiranda.com Mobile Site
  New Feature: SMS Notification alert
  New Feature: Buy & Sell Watchlist
  

FM Forums | Canon Forum | Join Upload & Sell

  

Archive 2015 · Canon 600 f/4 IS DO lens patent...

  
 
arbitrage
Offline
• • • • • • •
Upload & Sell: On
p.1 #1 · p.1 #1 · Canon 600 f/4 IS DO lens patent...


Peter predicts the 800 DO....looks like Canon may go the 600 route instead...or maybe both eventually....fun times....can anyone predict the weight based on 400 DO vs theoretical 400 f/4 lens....

http://www.canonrumors.com/2015/07/patent-canon-ef-600mm-f4-do-is/



Jul 20, 2015 at 07:39 AM
mitesh
Offline
• • • • •
Upload & Sell: On
p.1 #2 · p.1 #2 · Canon 600 f/4 IS DO lens patent...


I would be thrilled to see a 600/4 DO or 800/5.6 DO. Instead of built-in teleconverters, I would prefer if Canon could find a way to develop standalone teleconverters that have an engagement switch like the built-in teleconverter on the 200-400. That way you could have a set of removable extenders that you can use with all your lenses. It would also allow you to minimize the lens size if you're traveling, whereas if the extender is built-in, then you can't recoup any space savings. Would be great to have a 600/4 DO with removable 1.4x and 2.0x extenders that you could mount in tandem, and then just engage or disengage as needed with the flip of a switch. It would be the closest thing to a super-telephoto zoom in that you would have 600mm, 840mm, and 1200mm available to you without having to mount/dismount extenders. I think that would be a huge benefit in the field.


Jul 20, 2015 at 09:51 AM
johnctharp
Offline
• • • • •
Upload & Sell: Off
p.1 #3 · p.1 #3 · Canon 600 f/4 IS DO lens patent...


mitesh wrote:
I would be thrilled to see a 600/4 DO or 800/5.6 DO. Instead of built-in teleconverters, I would prefer if Canon could find a way to develop standalone teleconverters that have an engagement switch like the built-in teleconverter on the 200-400. That way you could have a set of removable extenders that you can use with all your lenses. It would also allow you to minimize the lens size if you're traveling, whereas if the extender is built-in, then you can't recoup any space savings. Would be great to have a 600/4 DO with removable 1.4x and 2.0x extenders that
...Show more

What you're talking about is a 'zoom' converter that can change between 1.0x and an extended magnification. If you just move the converter out of the optical pathway, what you'd have is an extension tube .



Jul 20, 2015 at 09:58 AM
mitesh
Offline
• • • • •
Upload & Sell: On
p.1 #4 · p.1 #4 · Canon 600 f/4 IS DO lens patent...


johnctharp wrote:
What you're talking about is a 'zoom' converter that can change between 1.0x and an extended magnification. If you just move the converter out of the optical pathway, what you'd have is an extension tube .


That's why it would require some type of development effort. Removing the glass from the optical pathway creates an extension tube, as you said, and that's not desirable. I have no idea if this is feasible or not, but hey, it's a gear forum and it sure sounded cool in my mind .



Jul 20, 2015 at 10:28 AM
dgdg
Offline
• • • • •
Upload & Sell: Off
p.1 #5 · p.1 #5 · Canon 600 f/4 IS DO lens patent...


Although its a nice problem to have, fumbling with extenders based on subject distance and light can be a touch annoying. I'll fund Mitesh's kick starter project!

David



Jul 20, 2015 at 10:39 AM
David Garcia
Offline
• • •
Upload & Sell: Off
p.1 #6 · p.1 #6 · Canon 600 f/4 IS DO lens patent...


arbitrage wrote:
Peter predicts the 800 DO....looks like Canon may go the 600 route instead...or maybe both eventually....fun times....can anyone predict the weight based on 400 DO vs theoretical 400 f/4 lens....

http://www.canonrumors.com/2015/07/patent-canon-ef-600mm-f4-do-is/


6 Pounds or below... my guess for the 600



Jul 20, 2015 at 12:11 PM
Schlotkins
Offline
• • • •
Upload & Sell: Off
p.1 #7 · p.1 #7 · Canon 600 f/4 IS DO lens patent...


David Garcia wrote:
6 Pounds or below... my guess for the 600


So I'm quite curious about this. I don't know how big the weight savings is on the 400 DO II. Here's a few ways to think about it:

The 300 2.8 II + 1.4x weights 2575g. The 400 5.6 weights about 1250. So that's a ratio of about 2:1 for an increase in stop of light. You get a similar ratio if you look at the 300 4 and 300 2.8 II. So, as one would expect, a 1 stop increase in light doubles the weight of the lens.

Now, the DO is less than that. 2100g/1250g = 1.68. So it's 1.68/2 = 84% of the weight expected. That means a 7 lb 600 4.0.

Length savings is similar. the DO is 9.16" long. The 300 2.8 + 1.4 is almost 11". That's about 83% of the expected length or close to 14".

So the bottom line is I'd expected a 600 f4 DO to be the size and weight of the 500 II. I would be more than happy for that.

Of course, the size/weight savings could be non-linear with mm so...

Chris



Jul 20, 2015 at 12:55 PM
ox0312
Offline
• • •
Upload & Sell: On
p.1 #8 · p.1 #8 · Canon 600 f/4 IS DO lens patent...


What this will do to the sales of current 600mm vii and 500 v II? Not sure how this will materialize.

IMO, 600mm 5.6 will be better in terms of weight, price and sales for Canon. You will have f4 options in L glass and cheaper handholdable f5.6 options in DO glass.



Jul 20, 2015 at 01:01 PM
Imagemaster
Offline
• • • • • • •
Upload & Sell: On
p.1 #9 · p.1 #9 · Canon 600 f/4 IS DO lens patent...


ox0312 wrote:
IMO, 600mm 5.6 will be better in terms of weight, price and sales for Canon. You will have f4 options in L glass and cheaper handholdable f5.6 options in DO glass.


And we all know what a ridiculous price 600 f4 DO would be.

And we also know that a patent does not equal a product.



Jul 20, 2015 at 01:21 PM
Pixel Perfect
Offline
• • • • • • •
Upload & Sell: On
p.1 #10 · p.1 #10 · Canon 600 f/4 IS DO lens patent...


David Garcia wrote:
6 Pounds or below... my guess for the 600


Only 6 pounds, that's very cheap and I'll take 4 at that price.



Jul 21, 2015 at 03:49 AM
dolina
Offline
• • • •
Upload & Sell: Off
p.1 #11 · p.1 #11 · Canon 600 f/4 IS DO lens patent...


After 2020


Jul 21, 2015 at 04:52 PM
EB-1
Offline
• • • • • • •
Upload & Sell: Off
p.1 #12 · p.1 #12 · Canon 600 f/4 IS DO lens patent...


It's too bad that the lens does not zoom.
A 200-600/4 or 250-600/4 would be nice.

EBH



Jul 21, 2015 at 09:02 PM
arbitrage
Offline
• • • • • • •
Upload & Sell: On
p.1 #13 · p.1 #13 · Canon 600 f/4 IS DO lens patent...


EB-1 wrote:
It's too bad that the lens does not zoom.
A 200-600/4 or 250-600/4 would be nice.

EBH


And bloody heavy....



Jul 21, 2015 at 09:28 PM
EB-1
Offline
• • • • • • •
Upload & Sell: Off
p.1 #14 · p.1 #14 · Canon 600 f/4 IS DO lens patent...


arbitrage wrote:
And bloody heavy....


But it's DO light.

EBH



Jul 21, 2015 at 09:53 PM
EB-1
Offline
• • • • • • •
Upload & Sell: Off
p.1 #15 · p.1 #15 · Canon 600 f/4 IS DO lens patent...


mitesh wrote:
I would be thrilled to see a 600/4 DO or 800/5.6 DO. Instead of built-in teleconverters, I would prefer if Canon could find a way to develop standalone teleconverters that have an engagement switch like the built-in teleconverter on the 200-400. That way you could have a set of removable extenders that you can use with all your lenses. It would also allow you to minimize the lens size if you're traveling, whereas if the extender is built-in, then you can't recoup any space savings. Would be great to have a 600/4 DO with removable 1.4x and 2.0x extenders that
...Show more
johnctharp wrote:
What you're talking about is a 'zoom' converter that can change between 1.0x and an extended magnification. If you just move the converter out of the optical pathway, what you'd have is an extension tube .

mitesh wrote:
That's why it would require some type of development effort. Removing the glass from the optical pathway creates an extension tube, as you said, and that's not desirable. I have no idea if this is feasible or not, but hey, it's a gear forum and it sure sounded cool in my mind .


The optics would need to be designed to focus with the empty tube (TC off to the side) in place. There would have to be an empty tube if the TC is not used and one doesn't want to carry the extra weight of the TC. However, the structural integrity of such a tube is not ideal in a long lens.

I'm sure some of you remember the old 2-piece Leica big teles which allowed a range of FL and apertures.

EBH

EBH



Jul 21, 2015 at 09:57 PM





FM Forums | Canon Forum | Join Upload & Sell

    
 

You are not logged in. Login or Register

Username       Or Reset password



This site is protected by reCAPTCHA and the Google Privacy Policy and Terms of Service apply.