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Author Topic: Canon EF 40mm f/2.8 STM Information.  (Read 31085 times)

bvukich

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Re: Canon EF 40mm f/2.8 STM Information.
« Reply #30 on: June 07, 2012, 01:42:31 PM »
Wow...a very flat, very light normal prime. Such a lens will make carrying and shooting with my forthcoming 1D X like.....carrying and shooting with a 1D X.  Guess I just don't see the point.  Maybe with the new Rebel...

Don't think of it as a cheap lens, think of it as an expensive body cap that you can take pictures through.

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Re: Canon EF 40mm f/2.8 STM Information.
« Reply #30 on: June 07, 2012, 01:42:31 PM »

dstppy

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Re: Canon EF 40mm f/2.8 STM Information.
« Reply #31 on: June 07, 2012, 01:44:41 PM »
Wow...a very flat, very light normal prime. Such a lens will make carrying and shooting with my forthcoming 1D X like.....carrying and shooting with a 1D X.  Guess I just don't see the point.  Maybe with the new Rebel...

Maybe you can wear it around as a monocle?

Besides, this will be out a full year before the 1Dx hits the street :D
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bornshooter

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Re: Canon EF 40mm f/2.8 STM Information.
« Reply #32 on: June 07, 2012, 01:45:30 PM »
would love to see an L series version

azizjhn

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Re: Canon EF 40mm f/2.8 STM Information.
« Reply #33 on: June 07, 2012, 01:49:39 PM »
I guess it will make more sense with mirror less camera any way for me will get it.

hammar

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Re: Canon EF 40mm f/2.8 STM Information.
« Reply #34 on: June 07, 2012, 02:01:51 PM »
I guess if you are shooting with tele lenses (like 400/5.6) 99% of the time, this might be a nice lens to just have in your pocket for those 1% shoots you would like wide/normal perspective.
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Axilrod

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Re: Canon EF 40mm f/2.8 STM Information.
« Reply #35 on: June 07, 2012, 02:21:59 PM »
For $200 no one should be complaining, this seems like it's definitely geared towards entry-level users (which most people on here are not).  I can't believe it's so tiny though.

So has anyone figured out what STM means?
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Positron

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Re: Canon EF 40mm f/2.8 STM Information.
« Reply #36 on: June 07, 2012, 02:23:33 PM »
But why it has to be longer? Cant they bend light sharply enough to use big glass in a very short lens? What are physics restrictions to this? (Just curious :), an article regarding this would be an interesting read)

Material properties restrict how much the light can be bent.  To make fast aperture short lenses, you'd need new glass-like materials that have a higher index of refraction and have lower chromatic abberation properties.  Diffractive optics with their gratings can bend light more than traditional optics, but the technology is not yet good enough to deliver comparable or better IQ.

Due to my poor eyesight I have very high index of refraction lenses in my glasses to avoid having to wear ridiculously thick lenses on my face, and there's a slight lateral shift at certain wavelengths; bright red and deep blue objects appear to be in a different physical location than they actually are when I look through my glasses at them. The worst part is, the index of refraction is only slightly higher than "traditional" high index lenses. The diminishing returns are pretty dramatic.

Physically there's nothing actually stopping you from almost perfectly correcting such an image, but as the index of refraction goes up it gets more and more complicated, and you'd have to have a large number of very, very thin lenses to make it work, and the cost involved would be crazy.

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Re: Canon EF 40mm f/2.8 STM Information.
« Reply #36 on: June 07, 2012, 02:23:33 PM »

mb66energy

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Re: Canon EF 40mm f/2.8 STM Information.
« Reply #37 on: June 07, 2012, 02:24:45 PM »
Wow...a very flat, very light normal prime. Such a lens will make carrying and shooting with my forthcoming 1D X like.....carrying and shooting with a 1D X.  Guess I just don't see the point.  Maybe with the new Rebel...

Don't think of it as a cheap lens, think of it as an expensive body cap that you can take pictures through.

Good remark!

What's missing: A tiny mirrorless. Think of it as an expensive lens cap that you can take pictures with.  ;)

Both would make a great combo.
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jonmlee

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Re: Canon EF 40mm f/2.8 STM Information.
« Reply #38 on: June 07, 2012, 02:51:36 PM »
For $200 no one should be complaining, this seems like it's definitely geared towards entry-level users (which most people on here are not).  I can't believe it's so tiny though.

So has anyone figured out what STM means?

STM (Stepping Motor) AF operation of the motor is equipped with dramatically reduced noise and smooth movement of the AF drive control is possible.

distant.star

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Re: Canon EF 40mm f/2.8 STM Information.
« Reply #39 on: June 07, 2012, 03:12:30 PM »
Wow...a very flat, very light normal prime. Such a lens will make carrying and shooting with my forthcoming 1D X like.....carrying and shooting with a 1D X.  Guess I just don't see the point.  Maybe with the new Rebel...

Don't think of it as a cheap lens, think of it as an expensive body cap that you can take pictures through.


I see. So this is the real solution to the 5D3 "light leak." A see-through body cap! That's Canon for you; always thinking.
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Re: Canon EF 40mm f/2.8 STM Information.
« Reply #40 on: June 07, 2012, 03:18:10 PM »

So has anyone figured out what STM means?

Slow to materialise?  ;)

ideaworx

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Re: Canon EF 40mm f/2.8 STM Information.
« Reply #41 on: June 07, 2012, 03:18:45 PM »
If you want a really good feel for what this will be like, lock together a body cap and a rear lens cap and hold them flush against the lens mount of your camera.

Indeed, if it's really under $200, I can easily see it becoming a popular choice for a replacement body cap! think about it...you can either cap the body with a bulky lens (even the Plastic Fantastic is awkward as a body cap), a functionless piece of plastic, or an actual lens that's right about at the textbook "normal" focal length for full frame.

I'll personally wait for some lens reviews...but if the IQ wide open doesn't suck, I can easily see getting at least one per body.

b&

I love this idea, and very functional too!
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ideaworx

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Re: Canon EF 40mm f/2.8 STM Information.
« Reply #42 on: June 07, 2012, 03:19:48 PM »
would love to see an L series version

Agreed
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Re: Canon EF 40mm f/2.8 STM Information.
« Reply #42 on: June 07, 2012, 03:19:48 PM »

Rocky

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Re: Canon EF 40mm f/2.8 STM Information.
« Reply #43 on: June 07, 2012, 03:36:17 PM »
I've got a bad feeling about the price of these new STM lenses....

I sure hope this pancake comes in at about $200.   We could start a pricing pool -- unfortunately my guess would be $400.

Sure hope $200 wins the pool!
If Canon  can sell the 50mm f1.8 II at $100. The 40mm f2.8 can be sold for $100 also if the sales volume is large enough. Canon price it at $200 to make sure it can get the R &D and tooling cost back fast enough. Also canon does not expect the 40MM f2.8 will be sold as much as the 50mm f 1.8 II.

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Re: Canon EF 40mm f/2.8 STM Information.
« Reply #44 on: June 07, 2012, 04:09:34 PM »
If Canon  can sell the 50mm f1.8 II at $100. The 40mm f2.8 can be sold for $100 also if the sales volume is large enough.

I'd rather buy it for $200 with a usable f2.8 - unlike the 50/1.8 which is extreme mediocre at open aperture.

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Re: Canon EF 40mm f/2.8 STM Information.
« Reply #44 on: June 07, 2012, 04:09:34 PM »