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Author Topic: A New EF 50 f/1.8 IS? [CR1]  (Read 23639 times)

Rocky

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Re: A New EF 50 f/1.8 IS? [CR1]
« Reply #105 on: July 11, 2012, 12:53:34 PM »
We're not talking about vignetting at the edges of an image.  We're talking about photosite wells blocking photons arriving at oblique angles, "per photosite vignetting" or shadowing, if you like.

Up until I wrote that post I thought that the cutoff was at f/2, but apparently it's actually f/2.8.  That's rather disappointing.  It probably changes from camera to camera slightly, depending on the sensor and photosite design (at the very least, it could change or someday be "fixed" in a new design).

I think what Edwin is referring to are these findings from DxO and Luminous Landscapes back in 2010.

http://www.luminous-landscape.com/essays/an_open_letter_to_the_major_camera_manufacturers.shtml
http://www.dxomark.com/index.php/Publications/DxOMark-Insights/F-stop-blues

Thanks for the website. This is really open up a can of worm. Just playing the devils advocate: If the lost of light is due to the angle of incident of light from the edge of the large aperture, then the crop sensor should be less affected. But the data says the opposite. why????. It will be inteersting for someone to do the same study on a 85 f1.8 and a 50 f1.8 on the same camera.

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Re: A New EF 50 f/1.8 IS? [CR1]
« Reply #105 on: July 11, 2012, 12:53:34 PM »

jweu

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A New EF 50 f/1.8 IS? [CR1]
« Reply #106 on: July 11, 2012, 02:13:03 PM »
It should have an aspherical lens for best image quality at aperutre at f/2.0.
Leica and Sigma are still using this feature.

Etienne

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Re: A New EF 50 f/1.8 IS? [CR1]
« Reply #107 on: July 11, 2012, 03:42:40 PM »
We're not talking about vignetting at the edges of an image.  We're talking about photosite wells blocking photons arriving at oblique angles, "per photosite vignetting" or shadowing, if you like.

Up until I wrote that post I thought that the cutoff was at f/2, but apparently it's actually f/2.8.  That's rather disappointing.  It probably changes from camera to camera slightly, depending on the sensor and photosite design (at the very least, it could change or someday be "fixed" in a new design).

I think what Edwin is referring to are these findings from DxO and Luminous Landscapes back in 2010.

http://www.luminous-landscape.com/essays/an_open_letter_to_the_major_camera_manufacturers.shtml
http://www.dxomark.com/index.php/Publications/DxOMark-Insights/F-stop-blues

Thanks for the website. This is really open up a can of worm. Just playing the devils advocate: If the lost of light is due to the angle of incident of light from the edge of the large aperture, then the crop sensor should be less affected. But the data says the opposite. why????. It will be inteersting for someone to do the same study on a 85 f1.8 and a 50 f1.8 on the same camera.

Sensor size is one factor. Pixel pitch is another. Pixels in the 18 MP APS-C are much smaller than in 21 MP FF. The pixels are treated like tubes or wells. A narrower diameter omits more peripheral light than a wider diameter tube.

Focal length shouldn't make much difference. It is primarily an aperture effect.

floex712

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Re: A New EF 50 f/1.8 IS? [CR1]
« Reply #108 on: July 11, 2012, 05:09:43 PM »
So far, I have not had any need for IS on my Nifty-Fifty. However, any upgrades are ALWAYS welcome, granted they work the way they were intended to do so. The only problems I have with this is;
1. 50mm f/1.8 IS, sounds like a replacement for the Nifty-Fifty, NOT the 50mm f/1.4, and
2. I agree with most of you on here, Canon will more than likely bump up the price significantly.

Now it is true that the Nifty-Fifty has too few aperture blades-which I don't mind as this has never been a problem for bokeh for me. If the 50mm f/1.8 IS included 7 or 8 blades, an upgrade in construction quality and the IS, then I wouldn't mind dishing out a reasonable amount, however, again, Canon would want $600 and not just the $300 - $400 you can currently purchase the 50mm f/1.4 for.

Those are my 2 cents.

Rocky

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Re: A New EF 50 f/1.8 IS? [CR1]
« Reply #109 on: July 12, 2012, 02:23:23 AM »
We're not talking about vignetting at the edges of an image.  We're talking about photosite wells blocking photons arriving at oblique angles, "per photosite vignetting" or shadowing, if you like.

Up until I wrote that post I thought that the cutoff was at f/2, but apparently it's actually f/2.8.  That's rather disappointing.  It probably changes from camera to camera slightly, depending on the sensor and photosite design (at the very least, it could change or someday be "fixed" in a new design).


I think what Edwin is referring to are these findings from DxO and Luminous Landscapes back in 2010.

http://www.luminous-landscape.com/essays/an_open_letter_to_the_major_camera_manufacturers.shtml
http://www.dxomark.com/index.php/Publications/DxOMark-Insights/F-stop-blues

Thanks for the website. This is really open up a can of worm. Just playing the devils advocate: If the lost of light is due to the angle of incident of light from the edge of the large aperture, then the crop sensor should be less affected. But the data says the opposite. why????. It will be inteersting for someone to do the same study on a 85 f1.8 and a 50 f1.8 on the same camera.

Sensor size is one factor. Pixel pitch is another. Pixels in the 18 MP APS-C are much smaller than in 21 MP FF. The pixels are treated like tubes or wells. A narrower diameter omits more peripheral light than a wider diameter tube.

Focal length shouldn't make much difference. It is primarily an aperture effect.
I was looking at the DXO chart and compare the 'lost light effect" between the APS-C and FF with the same pixel pitch. The APS-C is twice the lost of FF.

Etienne

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Re: A New EF 50 f/1.8 IS? [CR1]
« Reply #110 on: July 12, 2012, 08:56:08 AM »
We're not talking about vignetting at the edges of an image.  We're talking about photosite wells blocking photons arriving at oblique angles, "per photosite vignetting" or shadowing, if you like.

Up until I wrote that post I thought that the cutoff was at f/2, but apparently it's actually f/2.8.  That's rather disappointing.  It probably changes from camera to camera slightly, depending on the sensor and photosite design (at the very least, it could change or someday be "fixed" in a new design).


I think what Edwin is referring to are these findings from DxO and Luminous Landscapes back in 2010.

http://www.luminous-landscape.com/essays/an_open_letter_to_the_major_camera_manufacturers.shtml
http://www.dxomark.com/index.php/Publications/DxOMark-Insights/F-stop-blues

Thanks for the website. This is really open up a can of worm. Just playing the devils advocate: If the lost of light is due to the angle of incident of light from the edge of the large aperture, then the crop sensor should be less affected. But the data says the opposite. why????. It will be inteersting for someone to do the same study on a 85 f1.8 and a 50 f1.8 on the same camera.

Sensor size is one factor. Pixel pitch is another. Pixels in the 18 MP APS-C are much smaller than in 21 MP FF. The pixels are treated like tubes or wells. A narrower diameter omits more peripheral light than a wider diameter tube.

Focal length shouldn't make much difference. It is primarily an aperture effect.
I was looking at the DXO chart and compare the 'lost light effect" between the APS-C and FF with the same pixel pitch. The APS-C is twice the lost of FF.

Ok.

Yes I see that. The older APS-C sensors seem to perform worse. Might have to do with sensor design. Better microlenses? Different AA filter? There seems to be a lot of factors that affect the final measurement.

Axilrod

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Re: A New EF 50 f/1.8 IS? [CR1]
« Reply #111 on: July 15, 2012, 01:49:22 PM »
That 50mm f/1.8 has been very popular with APS-C users, and on an APSC sensor 50mm is relatively long and could greatly benefit from IS.  So what if the price goes up?  You get what you pay for.
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Re: A New EF 50 f/1.8 IS? [CR1]
« Reply #111 on: July 15, 2012, 01:49:22 PM »

blaydese

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Re: A New EF 50 f/1.8 IS? [CR1]
« Reply #112 on: July 20, 2012, 07:16:53 PM »
How do you brighten the image?  Not with DPP.  Daniel Browning recommended RawTherapee last year; there is also The GIMP, Lightroom, or Darktable (a Lightroom replacement for Linux boxen).

I'm going to give http://rawtherapee.com/ a try.  I'll let you know how it comes out.

Peace! 8)

haring

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Re: A New EF 50 f/1.8 IS? [CR1]
« Reply #113 on: July 24, 2012, 10:50:04 AM »
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<strong>A new 50?<br />


</strong>A purported replacement to the EF 50 f/1.4 was mentioned today in the form of an EF 50 f/1.8 IS. The lens would be smaller than the current 50 f/1.4. There is no imminent announcement of such a lens, but Canon is working to replace the 50 f/1.4 sometime in the next year. The current 50 f/1.8 would remain in the lineup.</p>
<p><strong>CR’s Take</strong><br />


There’s no doubt in my mind Canon is working on a couple of new 50mm lenses. With IS added to the new 24 & 28mm primes, IS in a 50 shouldn’t surprise anyone. It would be a welcomed lens if they can make it small enough to work well on a mirrorless platform.</p>
<p>Take this one with a grain of salt….</p>
<p><strong><span style="color: #ff0000;">c</span>r</strong></p>


I am not sure why Canon would build one. The 50mm 1.8 is fast enough and an awesome lens for low light photography. I use it a lot for weddings. No need for IS. I would rather have IS in my 24-70mm L lens. I use it too often for wedding parties and the IS would be awesome for the 24-70mm lens for sure!!!

Videoshooter

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Re: A New EF 50 f/1.8 IS? [CR1]
« Reply #114 on: July 25, 2012, 08:51:47 PM »
I'd love to have IS for video in this lens.

At the moment I'm about to upgrade to FF with a 5dmkII, one of the main reasons being that my 50mm 1.4 will be easier to handhold, which is sometimes a necessity at weddings when shooting the cake cutting or dancing at the end of the reception. I'll also be adding a 28mm 1.8 for even easier handholding in lowlight.
5dmkII, 60D, 70-200mm f/2.8, 50mm f/1.4, 85mm f/1.8, Tamron 17-50mm f/2.8, Sigma 150-500mm.

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Re: A New EF 50 f/1.8 IS? [CR1]
« Reply #114 on: July 25, 2012, 08:51:47 PM »