November 26, 2014, 06:13:15 PM

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Messages - Sporgon

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EOS Bodies / Re: do you hope for sony sensors in the 5D MK 4?
« on: November 06, 2014, 06:45:25 AM »
I think the real question for you Jon_D is if Canon were to put Sony sensors in their dslrs, what are you going to do with your life ?

There is a way to make the 24-105L as good as the 24-70II for your landscape pictures: shoot in portrait and stitch. You'll be using a longer focal length so no need to worry about the rather 'added afterthought' results of the 24mm end.

If I was looking to use the lens for shallow dof portrait style images instead of primes I would go for the 24-70II if affordable. Test charts don't give the full picture.

EOS Bodies / Re: 46MP body rumor is hoax?
« on: November 05, 2014, 09:16:44 AM »
The reality with 46 mp on FF is that you are only gaining potential resolution via more pixels. The magnification and light gathering is still limited to the FF format size. It takes takes resolving power of the lens to use those extra pixel densities, and magnification on FF isn't that high.

This is why people are not seeing the benefit of real extra 'reach' on the crop sensors, or at least nothing like they would expect when comparing up sampled central 8 mp from the FF and 18 from the whole of the crop sensor.

In practice you don't just need more pixels for more resolution; you need magnification and light as well. The crop sensor gives you the extra pixels but no more magnification and light than the FF sensor cropped to APS.

In just the same way you can up sample the image without losing anything like you would expect so you can do the same with a 23 mp FF sensor against a 36 or 46 or whatever FF sensor. You can also run into the issues of smaller pixels receiving less individual light and less saturation etc.

I'm sure the reason why Canon haven't yet introduced a 'very high' mp FF sensor is that in reality there just isn't much point to it.

May I ask you for some advice:

My 6D has an temporary problem with the front wheel. I am (problem occurs sometime rare, sometime each hour one time) not able to change the setting (Av, time,...) with the front wheel. But the wheel on the high-format grip works well. (If I remove the battery grip, I does not fix the problem). I have to remove the battery for some minutes, then the front wheel works well again.
The second temproray problems belongs to the AF: In servo mode, it occurs that the AF stops working, although the trigger is pressed halfway. The I have to press the trigger button a few time, then it works again.
Did anybody have such a problem too? What was the problem of your 6D?

My problem is, that the CPS service company  returned the cam without finding anything. They just took 5 shots (as the numbers of shots is just 5 higher than my last shot).

Are you using genuine Canon battery grip or an after market maker ?

Pricewatch Deals / Re: 24-70mm f/4L IS: atomic rebate in Switzerland !
« on: November 03, 2014, 03:28:44 PM »
I've been predicting that we will see the lens for $700 by Christmas.  Few want one, and its undoubtedly cheap to make.

It may possibly be relatively cheap to make; it doesn't use a ground glass aspherical element like the 24-70 / 2.8 for one thing, but I don't think it is cheap to assemble. Roger at Lens Rentals stated that it has an unprecedented amount of adjustment on the elements, and I'm guessing that inexperienced / poorly trained assembly in the early days caused some of the bad reviews.

Pricewatch Deals / Re: 24-70mm f/4L IS: atomic rebate in Switzerland !
« on: November 03, 2014, 03:24:45 PM »
I've been predicting that we will see the lens for $700 by Christmas.  Few want one, and its undoubtedly cheap to make.

I wanted one, but since the good people of this forum insist on the awesomeness of 24-70 f/2.8 II, i find my self unable to resist getting the more expensive one.

Welcome to the corruption of Canon Rumors  ;)

EOS Bodies / Re: Canon 7Dii vs Nikon D750 Dynamic Range Test
« on: November 02, 2014, 03:46:12 PM »

I doubt tinkering around with the microlenses will make a big difference, reminds me of what they marketed on 5d2->5d3 and we know how much of a difference that made.

No, the 5DIII has significant improvements over the 5DII, but they are subtleties that the philistonian user may not appreciate or recognise.

Unlike an increase from 12 to 36 mp.

Lenses / Re: Sigma or Canon (50mm 1.4)
« on: November 01, 2014, 04:23:20 PM »
Im in the market for a 50mm 1.4 but I would like if anyone can give me a suggestion of which lense to choose from sigma 50mm 1.4 (not the art) or canon 1.4 (pros & cons)  I shoot with a 60D

I would say the general consensus out there is that the Sigma 50 DG focuses much better on an APS camera such as your 60D than it does on a FF.

However don't discount the EF 50 1.4. It is actually capable of producing stunning results, fragile mechanism not withstanding.

And then the blacks:

To summarise, we have lost saturation in the lighter blue and have gained nothing in the smoothness of the blacks.

Here are the second two after applying appropriate curves etc..

Though I have found that well over exposed very subtle evening skies cannot be lowered to accurately reflect the tonality of a more traditionally exposed shot, I have never learnt why.

That is what I find, and I believe the reason that that we are losing accuracy with that level of over exposure, especially saturation.

I remember the original article produced by LL in 2002 regarding over exposure to achieve an improved raw file, and in those days they were dealing with( no surprise), digital tech from 2002, where tonal transition was poor compared with film, especially with CMOS, which was (IMO) inferior to CCD at that time. They were referring to the fact that if you did not have data recorded in the top one fifth of the histogram you were losing fifty percent of the potential information., which is correct in theory, but, doesn't deal with lose of accuracy and saturation.

It is now generally accepted that to maximise the IQ potential in a scene that includes bright and dark you want to pull the recorded data across to the right as much as much as possible in order to preserve information in the dark areas, allowing specular highlights to blow etc; it's all sound practice.

There is a benefit from over exposing a relatively small amount and then bringing the raw file back down in post. Look at the effect of pulled ISOs on SNR on some cameras.

However in the recent article, suggesting that the optimum exposure for the black cat is the one on the right is just a load of bull. You might get away with it when the majority of the tones are black, but that doesn't mean it is sound technique.

I took a couple of comparison shots to try and show what I mean, and have incorporated blue as it helps with the difference.

The first picture (ending 5) is exposed using settings determined by an incident light meter. The matrix metering of the camera was wanting to overexpose by two thirds of a stop more.

The second picture (ending in 6) is over exposed from the 'correct' exposure by two full stops. This was then reduced by two stops before converting the raw to 16 bit TIFF. Even with the pictures reduced for web display you can ( hopefully, I haven;t seen them yet of course) see the difference in the blue.

In the second two images, both at 50%, I have applied the appropriate curves and saturation, and then balanced the lesser exposed one in levels to equal them up. The loss of saturation in the blue bucket is clear, and I cannot get it back to being identical.

The final two images are at 100% of the black buckets and there is no difference in 'IQ' or noise. Overall the correctly exposed image is the better one.

Lenses / Re: Canon 6d vs 24-70mm mark ii
« on: October 30, 2014, 02:18:52 PM »
A lens is always above a body... Go for the 24-70, great lens! :)

Not at all sure that that is always the correct way to look at it, especially when there are leaps forward in technology.

I would go for a 6D and get your 24-70 f2.8 tuned up by a Canon 'L' lens specialist service centre.

EOS Bodies / Re: Canon 7D Mark II Owners first thoughts
« on: October 30, 2014, 10:01:43 AM »
I'm fascinated by your frame numbers; you haven't got to 9967 already have you ?

EOS Bodies / Re: Modular DSLR Coming from Canon? [CR2]
« on: October 29, 2014, 02:10:23 PM »
Wouldn't surprise me if the modular bit is the interchangeable viewfinder / prism, one the usual optical pentaprism for use in 'still' photography, and another an EVF primarily intended for video use.

Technical Support / Re: failing shutter on 60D
« on: October 29, 2014, 05:51:00 AM »

Glad it is sorted, but there goes your excuse to upgrade!

I disagree. If ever Don needed a really thorough weather sealed camera, here is the proof. Or rather a fur sealed camera.

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