Richard Butler

Richard Butler

DPReview Administrator
Lives in United Kingdom Seattle, United Kingdom
Joined on Nov 7, 2007

Comments

Total: 5076, showing: 61 – 80
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On article What is equivalence and why should I care? (2463 comments in total)
In reply to:

NewShoota: Thanks for this,

So does this mean a f2.8 on a GH5 will be the equivalent of a f5.6 on a FF Canon or Nikon?

Regards,

NewShoota

(looking to buy 1st serious camera and was considering GH5 for Sports Pics & Video)

Even with more depth-of-field, there's still a plane of perfect focus and everything away from that is increasingly out-of-focus, so more depth-of-field will mean that missed focus is less likely to be calamitous - it's not much of a substitute for actually having focus in the correct point.

However, I'd agree with the previous poster in saying that you shouldn't solely use equivalence as a way of picking a camera. For sports (stills), you need a highly capable AF system, for video, you need a camera with a good video feature set and good video quality. I'm not sure I can think of a single camera that excels in both respects.

The GH5 is very good, though, especially on the video side of that equation.

Link | Posted on Jul 3, 2017 at 17:48 UTC

Sadly not Impossible Project?

Link | Posted on Jun 30, 2017 at 23:06 UTC as 89th comment
On article Sony a9 banding issue: fact or fiction? (733 comments in total)
In reply to:

FuhTeng: Fascinating, huh. So what about Lloyd and this fussing about banding in the skies?

No, it's not (the giveaway being that the banding discussed by Lloyd and us in our review doesn't repeat every 12 pixels, instead it repeats with the same pattern as the stripes of the PDAF pixel rows)

Link | Posted on Jun 30, 2017 at 22:52 UTC
On article Sony a9 banding issue: fact or fiction? (733 comments in total)
In reply to:

FuhTeng: Fascinating, huh. So what about Lloyd and this fussing about banding in the skies?

Separate issue (as [discussed in the review](https://www.dpreview.com/reviews/sony-a9-full-review/5#pdaf_banding)).

Link | Posted on Jun 30, 2017 at 19:41 UTC
On article Sony a9 banding issue: fact or fiction? (733 comments in total)
In reply to:

otto k: Dear Richard, it is now obvious that you are paid by Canon and Sony to be pro and against Sony and Canon, but you are really paid by Samsung and this is all a front for an unexpected twist. Trust me, it sounds better when Wahlberg science explains it.
Observant readers will ask Wait, what, and Nikon? - and to that I can only reply - Exactly!
I hope this clears things up.

If only I could work out who to give my address to, because these payments I keep reading about never seem to reach me. :(

Link | Posted on Jun 30, 2017 at 17:53 UTC
On article Sony a9 banding issue: fact or fiction? (733 comments in total)
In reply to:

weixing: So this is similar effect of a CRT monitor refresh. If so, this should appear only when you shoot horizontally since the LED board refresh horizontally, right? What about the vertical shot that had this issue?

Weixing - what LED panel are you shooting? You say 'the' LED panel, but presumably you don't mean the same one Jared shot.

I don't know whether the LED sign boards in Jared's video are progressively scanning or are globally refreshing (but constantly pulsing to give the impression of different colour intensities).

Link | Posted on Jun 30, 2017 at 17:17 UTC
On article Sony a9 banding issue: fact or fiction? (733 comments in total)
In reply to:

M Chambers: How much did Canon pay for this story?

Canon? Wait, what?

Elsewhere we're being told that it must be a Sony advertorial (that points out that the a9's technology makes the problem look worse).

I'd hate to think how complex that would make the end-of-month billing, if any of this paranoid nonsense were true.

Link | Posted on Jun 30, 2017 at 16:02 UTC
On article Sony a9 banding issue: fact or fiction? (733 comments in total)
In reply to:

Tom Holly: It's quite disappointing that people are saying mechanical shutters suffer these striping problems just the same.i expect solid argument in camera wars but I do not expect misinformation

Where's the evidence to back up the claim that mech cameras are no different? Where are the images from dslrs with 24 zebra stripes?

Because that's what the behaviour of flickering lights and progressive shutters would lead you to expect.

At exposures shorter than a camera's flash sync speed, the shutter won't ever be fully open: it'll be exposed by a gap/slit between the first and second curtain, which travels across the sensor.

If the brightness of the light is changing as that slit moves, the brightness of the image will vary across the image. That's not news to most photographers who shoot under artificial light.

As the article says, this will look worse on the a9 because there'll be more bands (because the shutter is moving half as fast as most mechanical shutters) and, because of the way the a9 reads its sensor, they'll be more abrupt, hard-edged bands, rather than smoother, progressively brighter and darker bands.

However, and understanding of [the causes of banding](https://www.dpreview.com/articles/5816661591/electronic-shutter-rolling-shutter-and-flash-what-you-need-to-know/2#Flicker), would lead you to expect some form of banding with a mechanical shutter.

Bear in mind this is not an LED light, it's a display panel. It's not designed to give even illumination, it's design to flicked ultra fast so that it can generate lots of colours despite only being able to represent red, green and blue in a binary manner.

Link | Posted on Jun 30, 2017 at 15:52 UTC
In reply to:

princewolf: Alternative title "Why don't you buy an M6 with EF-M 22mm already?" Are they overstocked by any chance? :)

That would seem like the obvious reaction to me criticising its lack of viewfinder, lack of USB charging, saying I prefer Fujifilm's JPEGs and writing an article about the changing focus of our reviews.

Link | Posted on Jun 30, 2017 at 07:10 UTC
On article Sony a9 banding issue: fact or fiction? (733 comments in total)
In reply to:

OlyPent: A lot of talk about LED lighting but I saw banding in shadows of shots taken when this camera first appeared here in sunlit situations. What frequency is the sun?

OlyPent that looks like the PDAF stripes. Does it come from an area of flare in an image (where the left or right-looking pixels will see the bright flare but the other half won't, so will look wrong)?

Link | Posted on Jun 30, 2017 at 06:01 UTC
In reply to:

moontide: Anyone know the make of the car shown in photo number 7? I just can't quite make out name on the bonnet badge.

It's a [Nissan Figaro](https://en.m.wikipedia.org/wiki/Nissan_Figaro). An early 90s, Japan-only model based on the Nissan Micra floorplan. A remarkable number of them have ended up in the UK. Right-hand drive and all that.

Link | Posted on Jun 30, 2017 at 05:45 UTC
On article Sony a9 banding issue: fact or fiction? (733 comments in total)
In reply to:

Stitzer23: Woa it's like a mystery solved. Thanks DPR. Now please explain crop circles.

EDIT: But wait, shouldn't the banding follow (or be distorted by) the contours of the surface?

No. It's not that the signs are scanning vertically, the entire panels are flickering. The vertical bands come from the lighting changing while the exposure is progressively being captured, not from bands being projected onto the figures.

Link | Posted on Jun 30, 2017 at 05:43 UTC
On article Sony a9 banding issue: fact or fiction? (733 comments in total)
In reply to:

olypan: Amazon are determined to stamp out any dissent regarding the A9 during the honeymoon period.

Often techie camera website writes about techie camera issue (explaining how a9's technology exacerbates the issue), yup, I can see why you need conspiracy theories to explain that one.

Link | Posted on Jun 30, 2017 at 05:30 UTC
On article Sony a9 banding issue: fact or fiction? (733 comments in total)
In reply to:

weixing: So this is similar effect of a CRT monitor refresh. If so, this should appear only when you shoot horizontally since the LED board refresh horizontally, right? What about the vertical shot that had this issue?

The LEDs are flickering (so anything lit by them is getting brighter and darker all the time), so it doesn't matter if your camera is rotated vertically or horizontal: the brightness fluctuates between the shutter starting its motion and getting to the bottom of the frame so there's banding.

Link | Posted on Jun 30, 2017 at 05:04 UTC
On article Sony a9 banding issue: fact or fiction? (733 comments in total)
In reply to:

Dr Blackjack: It seems that in theory mechanical shutters (like the DSLR competition) are not immune to this problem either, so I would have loved to see how those cams perform in similar situations.

But does he have shots primarily lit by the sideline signs and did he know to specifically look for those images? Shoot the same scene in slightly brighter lighting and the contribution of the sideline signs will be less. Shoot longer exposures (there are some very high shutter speeds here), and the banding would be less intense.

And, as I say, the banding on an mechanical shutter would be half the frequency and appear less abrupt, since it'll be continuous waves, not hard-edged bands.

Until you know what the contributing factors are, it's hard to know where to look for similar effects.

Link | Posted on Jun 30, 2017 at 00:44 UTC
On article Sony a9 banding issue: fact or fiction? (733 comments in total)
In reply to:

Dr Blackjack: It seems that in theory mechanical shutters (like the DSLR competition) are not immune to this problem either, so I would have loved to see how those cams perform in similar situations.

Well, yes, but without access to the location where this happened, we can't go there and shoot another camera.

Link | Posted on Jun 30, 2017 at 00:14 UTC
On article Sony a9 banding issue: fact or fiction? (733 comments in total)
In reply to:

Dr Blackjack: It seems that in theory mechanical shutters (like the DSLR competition) are not immune to this problem either, so I would have loved to see how those cams perform in similar situations.

In principle this will be an issue with any rolling/progressive shutter.

Mechanical shutters operate at around twice the rate of the a9's electronic shutter so you'd get half as many bands, but you'd still get banding.

The other difference is that you'd get a smoother, progressively brighter and darker bands, rather than the hard-edged, 12-pixel-wide bands of the a9.

Link | Posted on Jun 30, 2017 at 00:10 UTC
In reply to:

Shlomo Goldwasser: Wifi? Easy workaround if you carry a 2euro card reader you can plug in your phone.

Usb charging? Try not to forget your charger next time, or alternatively plan your trip ahead and make sure you have the right socket adapter.

No viewfinder? Maximum brightness screen goes a long way, even on the sunniest of days.

My point is there are practical solutions to solving many of the problems you see, so I would not regard them as major concerns when promoting/reviewing a travel camera.

Size and usability on the other hand...

Much easier not to have to work 'round them, though.

Link | Posted on Jun 29, 2017 at 22:46 UTC
In reply to:

Timmbits: In my camera, I can choose between no electronic curtain,
electronic first curtain, or
electronic second curtain.

The argument can me made that when you press the shutter, you create a little movement anyways. therefore removing the advantage of an electronic first curtain to keep the camera stable.

Would this be the reason for having the electronic second curtain option? Or would it be something else? (for example, keeping the camera stable once the curtain is open, and closing behind and following as data is read out)

(in case it makes any difference, it's a Samsung NX20)

I can't find any reference to an electronic 2nd curtain shutter in the NX20 manual. I'm not sure I can work out how it would work.

Link | Posted on Jun 29, 2017 at 21:57 UTC
In reply to:

Matthew_R: What I'd love to see is a way for registered users to complete a profile about what we are looking for in a camera and to have the final "grade" that you give a camera based on that. For example, I'm a professional commercial photographer. I don't care about JPG and I don't really care about video. I don't even care so much if something is expensive if it's something that I actually need. Wouldn't it be great if when I logged in I could get a version of your in-depth reviews that puts less emphasis (in the conclusion) about those things? I know that it's a bunch of work, but the plus side is you'd get additional marketing information about each of your users.

Just a pie in the sky idea.

We're certainly aware of these criticisms. They're both things we're hoping to address with the scoring update (though we won't be able to stop people fixating on 1% here and there).

Link | Posted on Jun 29, 2017 at 17:19 UTC
Total: 5076, showing: 61 – 80
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