whumber

whumber

Lives in United States Rutland, VT, United States
Works as a Aerospace Engineer
Has a website at www.whumber.com
Joined on Dec 22, 2012

Comments

Total: 580, showing: 1 – 20
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In reply to:

wcan: The fact that the overheating seems to be card related gives hope that there may be a solution...even if it is more advanced cards that don't overheat when being run at high throughput. Does the "no card solution" also apply to 8K recording in addition to 4K?

I'd like to see a someone do a test with a separate custom card testing rig which can write to the memory cards at the same speed as R5 video and see if the cards start to overheat. DPreview can you do something like that?

@MikeRan Yes, that is exactly what testers are reporting; the cards are getting hot even without any actual write activity. It could be a bug in the Canon firmware, a bug in the CFExpress controller firmware, or even worse just something inherent to the nature of the CFExpress controller being used. It's why people are seeing an extra 3+ hours of recording just by taking the card out of the slot even when it wouldn't be used at all.

Link | Posted on Aug 9, 2020 at 01:25 UTC
In reply to:

wcan: The fact that the overheating seems to be card related gives hope that there may be a solution...even if it is more advanced cards that don't overheat when being run at high throughput. Does the "no card solution" also apply to 8K recording in addition to 4K?

I'd like to see a someone do a test with a separate custom card testing rig which can write to the memory cards at the same speed as R5 video and see if the cards start to overheat. DPreview can you do something like that?

@mikegt The CFExpress cards are heating up significantly even when not being written to, this is true in camera as well as in external readers. The truth is that unless you know the TDP of the sensor, processor, and cfexpress controller and cards, you have no clue about what is the main source of heat. Even then, the CFExpress cards may be generating less heat than the Sensor/CPU combo but if they have a lower temperature limit then they will be the limiting factor.

Link | Posted on Aug 8, 2020 at 23:27 UTC
In reply to:

wcan: The fact that the overheating seems to be card related gives hope that there may be a solution...even if it is more advanced cards that don't overheat when being run at high throughput. Does the "no card solution" also apply to 8K recording in addition to 4K?

I'd like to see a someone do a test with a separate custom card testing rig which can write to the memory cards at the same speed as R5 video and see if the cards start to overheat. DPreview can you do something like that?

@mikegt You should actually read what he posted. We've already seen demonstrations of the R5 doing 4 hours of continuous 4kHQ recording with an external recorder when the CFExpress cards are removed from the camera. If you do the same thing but leave a CFExpress card in the camera, even though it's not being recorded to, the camera displays an overheat warning within around 45 minutes.

Link | Posted on Aug 8, 2020 at 18:45 UTC
In reply to:

deepDEEPpurple: Forget video testing. We know it overheats on 8k/4k120/4k60/4k24. Those that need a dependable body won't use this for video.

What's worrying is the massive IQ issues in stills due to high temps inside of the body.

Canon says so on its own manual page 284 (emphasis mine)
https://gdlp01.c-wss.com/gds/5/0300039495/01/eosr5-ug-en.pdf

When you shoot at high ISO, noise (such as DOTS of light and BANDING) may become noticeable.

Shooting in high internal temps may cause NOISE and IRREGULAR colors in the image.

Frequent shooting over extended period may cause high internal temps and AFFECT IQ. When you are not shooting, ALWAYS turn off the camera.

If you shoot a long exposure while the camera’s temp is high, IQ may DECLINE. STOP shooting and wait a few MINUTES before shooting again.

White icon indicates that the IQ of photos will DECLINE. STOP shooting for a while and allow the camera to cool down.

Can you check these IQ issues? What about the banding reports and high temps/slow FPS?

@deepDEEPpurple The impact of temperature on image quality is pretty much exclusively limited to long, exposures. Sensor temperature has no meaningful impact on shot noise or electronic read noise outside of dark current noise. Dark current noise accumulates at a rate proportional to the sensor temperature and thus things like astrophotography could be impacted. Normal video and stills operations are not affected.

Link | Posted on Aug 8, 2020 at 18:43 UTC
In reply to:

bwana4swahili: Limited shooting time is one problem; however, a hot camera is also a noisy camera which would result in increasingly worse image/video quality as shooting continues... And it is damned hard to remove increasing noise throughout a video session!

Canon has a few things to resolve before the next release!

Shot noise and most electronic read noise is independent of temperature though. It's really only dark current noise that it affected by temperature and that's only relevant to long exposure stills.

Link | Posted on Aug 7, 2020 at 00:16 UTC
On article DPReview TV: Olympus 100-400mm F5.0-6.3 IS review (118 comments in total)
In reply to:

SB1956: This guy reminds me of the School Teacher who's end of term report condemns the pupil with feint praise.
No mention of the fact that the lens, unlike the Panasonic offering, accepts both the 1.4 and the 2.0 TC. Also, the weather sealing is supposed to be superior.
The comments about diffraction were not substantiated and in my experience with Olympus Pro Lenses will not be an issue at anything like f8-f9. Also, to finish, experienced Olympus telephoto shooters would have no real issue shooting this lens at relatively slow shutter speeds and the sensor is able to compete and produce good images at up to iso 3200. 1600 for those who are more critical.
Please, let's get real. Life is about compromises and not absolutes and for its target market, this lens's is well worth a look, particularly as mentioned if matched with the 12-100mm f4.

Are you suggesting that Olympus PRO lenses are less affected by diffraction than other brands?

Link | Posted on Aug 4, 2020 at 20:35 UTC
On article DPReview TV: Olympus 100-400mm F5.0-6.3 IS review (118 comments in total)
In reply to:

davob: I've read in another review (Mirrorless Comparisons) that the stabilization can be either IBIS or in-lens but not both. Has there been a definite claim by Olympus that this lens is part of the Sync system?

@Panther That's not correct, most of the other manufacturers have the lens correction for pitch and yaw while the IBIS corrects for X/Y-translation and roll. Here the IBIS is only correcting for roll. That said, we don't really know what they're doing as the marketing copy is almost certainly an overly gross explanation.

Link | Posted on Aug 4, 2020 at 15:27 UTC
On article DPReview TV: Olympus 100-400mm F5.0-6.3 IS review (118 comments in total)

The lenstip first impressions review of this lens is pretty brutal.

Link | Posted on Aug 4, 2020 at 14:01 UTC as 26th comment | 12 replies
In reply to:

bufo vulgaris: My god, what a clunker... Olympus did it again: They launched a lens that is bigger, slower, longer and heavier than the panasonic counterpart.

Let's look at the numbers if we comapre it with the pana-leica 100-400-4-6.3

Weight: Pana: 985g, Oly:1120g
Diameter: Pana: 83mm, Oly 86mm.
Length: Pana: 172mm, Oly 206mm.
Speed is basically the same but let us point out that the pana begins at f4

What were they thinking?

Seems like a mixed bag. On one hand seems like it's sharp at 400mm, weather sealed, maintains focal length at MFD, integrated arca swiss plate in the tripod foot, and construction quality is good. On the other hand reports seem to indicate that stabilization performance is quite poor, autofocus is very slow and has some hunting issues, bokeh with any kind of specular highlights is quite ugly, and flaring performance is awful.Seems like it's a bit overpriced for what they're offering. Also, looks like it's made in Japan so it's definitely a Sigma lens.

Link | Posted on Aug 4, 2020 at 12:57 UTC
On article DPReview TV: Canon EOS R5 review (933 comments in total)
In reply to:

PNad: The fast sensor readout for the electronic shutter is the real hero here, it should have been a big highlight by Canon.

Being able to shoot 20fps and have 45mp to crop? Seriously, this thing is now the ultimate sports camera.

@Pascal Do you have a link to the R5 readout speed being 6x faster than the A7RIV? That would be a really incredible result if it's correct as that would make it faster (1/90s) than every ILC camera other than the A9/A9ii.

Link | Posted on Aug 1, 2020 at 14:23 UTC
On article DPReview TV: Canon EOS R5 review (933 comments in total)
In reply to:

PNad: The fast sensor readout for the electronic shutter is the real hero here, it should have been a big highlight by Canon.

Being able to shoot 20fps and have 45mp to crop? Seriously, this thing is now the ultimate sports camera.

@sillen Do you actually know what the readout speed is or are you just assuming?

Link | Posted on Aug 1, 2020 at 14:21 UTC
On article DPReview TV: Canon EOS R5 review (933 comments in total)
In reply to:

deepDEEPpurple: EVF blackout won't help with fast action seems sensor readout is too slow to be completely bend free. Tony Northrup said the lag is bad.

Plus DR is still below the level of the A7R3/Z7 from fear years ago.

And focus point acquisition is still below the A7M3 which means that the box shows correctly but the shot comes out blurry. Untrustworthy.

Canon even warns of image quality degradation in case of long shoots : https://twitter.com/bojan_haron/status/1289515232381956097/photo/1

Too many ifs and buts to memorise the ideal conditions but one thing is for sure heat is killing this camera from the inside out.

@Kevin Overall they're actually decent reviewers but they do occasional screw the pooch. The biggest problem I see with the Northrups is that when they get an outlier result they seem to assume that they are correct and everyone else is wrong. Remember their video claiming the 70-200ii + 2X was sharper at 400mm than the 100-400ii? Or the D810 vs 5D3 video where they claimed the 5D3 only had a (IIRC) 40% hit rate on a subject walking slowly toward the camera? There's a bit of hubris there where they seem unable to accept that they are vulnerable to making mistakes when they put together reviews. They seem to have gotten a bit better about it in the past few years but it's definitely still there.

Link | Posted on Aug 1, 2020 at 14:20 UTC
In reply to:

Willow w: My local camera store got more than they expected. I was able to pick one up yesterday first thing that wasn't reserved for pre-orders.

I was very happy to see the sensor readout speed is fast enough for hummingbird wings and even ceiling fans set on high. :) More than fast enough for everything I do with sports and action, and 45MP too!

Oh and check Bill Claff's measurements, highest PDR for FF. (though seriously all the top cameras are the same in real life shooting).

@RubberDials Do you realize that in the two video links you've provided the R5 is actually shooting a burst with mechanical shutter while the A7Siii is simply focusing without actually taking any shots? They're not really comparable. You're coming off as kind of desperate to discredit the Canon.

Link | Posted on Aug 1, 2020 at 12:52 UTC
In reply to:

ContarexMan: The Canon EOS R5 is coming. Competition for MARKET SHARE is HEATING UP: Headline News:

Yes, Sony A7S III overheats – sometimes even FASTER than Canon EOS R5

Despite claims from Sony, early tests reveal that the Sony A7S III's 4K can overheat even WORSE than the Canon EOS R5.

Check out the story by James Artaius at:

https://www.digitalcameraworld.com/news/yes-sony-a7s-iii-overheats-sometimes-even-faster-than-canon-eos-r5

@JakeJY He did the test with and without the High Temp limit and got very similar results. He even redid the entire test in a 2nd video based on suggestions from comments and got the same results again. It seems to be either related to the specific camera he has or maybe has something to do with the environmental conditions he's shooting in.

Link | Posted on Aug 1, 2020 at 12:46 UTC
On article Olympus OM-D E-M1 Mark III review (1553 comments in total)
In reply to:

Parrallactic: (at an F11 equiv. aperture, mind you) This is a flowed statement and hugely misleading, and has gone on way too long.
It’s statements like that that have put Olympus future in jeopardy, as the majority are so called self taught, and if what they are taught is flowed, then so will be their actions as a result.
Those of us, like the Engineers at Olympus which actually have a degree and understand the science know the difference:
Crop factor does NOT affect a lens’s focal length.
Crop factor does NOT affect a lens’s aperture
https://www.bhphotovideo.com/explora/photography/tips-and-solutions/understanding-crop-factor

They didn't say that it changes the len's aperture or focal length. Equivalent focal length and aperture are simply used to relate how the image formed by one format with a given lens with compare to the image formed by another format.

Link | Posted on Jul 31, 2020 at 13:24 UTC
On article Olympus OM-D E-M1 Mark III review (1553 comments in total)
In reply to:

AmateurMike: Hmm, one thing I've noticed: studio scene shots are now "exposure corrected", so if a camera manufacturer is cheating on ISO and is using a lower real ISO for the EXIF'ed ISO to get a lower noise level, then it would have been darker, but you can't tell anymore. I don't think this is a good move.

They've been that way for a long time now.

Link | Posted on Jul 29, 2020 at 15:44 UTC
On article Olympus OM-D E-M1 Mark III review (1553 comments in total)
In reply to:

pollup: Personally not a fan of Olympus, but at least, it's the only company with Panasonic (I think) that can do handheld Pixel Shift. That should be a standard feature in all cameras.

Pentax is the other company that does handheld pixel shift.

Link | Posted on Jul 27, 2020 at 20:57 UTC
On article Olympus OM-D E-M1 Mark III review (1553 comments in total)
In reply to:

Gary Martin: Just like the EM5III, DPReview has problems with subject tracking AF, whereas most review sites praise it, including users. What's the truth here?

Dpreview has it right, the general subject tracking on the Olympus bodies is trash. The new face tracking on the E-M1iii and the AI subject tracking on the E-M1X, however, are fantastic.

Link | Posted on Jul 27, 2020 at 17:36 UTC
In reply to:

DrCastle: Frackin hilarious how some people say R5 is better than a7r4 and a9 combined. a7r4 shoots 60MP WITHOUT Antialiasing filter(whereas R5 has AA filter which decreases sharpness). Also there is no objective support whatsoever that R5 has autofocus system that matches that of a9(and a9m2). In fact the sample gallery of R5 shows almost 30% of missed-focus shots in the quintessential setting of a bicycle approaching in zig zag. I’m sorry but R5 is clearly a compromise between sports and high-res, and not a very good one at that. Look at D850 or a7r4 and you will find both amazing resolution(without AA filter) AND very good autofocus.(3D tracking / real time tracking)

@Handsome90 There's a thread on FM about it here.

https://www.fredmiranda.com/forum/topic/1645952

I believe there are more threads about it. Supposedly Sony is in the process of creating a firmware fix for that particular combination. Hopefully they can resolve the issue as the A7RIV + 200-600 should be an incredible combo for wildlife.

Link | Posted on Jul 16, 2020 at 15:25 UTC
In reply to:

DrCastle: Frackin hilarious how some people say R5 is better than a7r4 and a9 combined. a7r4 shoots 60MP WITHOUT Antialiasing filter(whereas R5 has AA filter which decreases sharpness). Also there is no objective support whatsoever that R5 has autofocus system that matches that of a9(and a9m2). In fact the sample gallery of R5 shows almost 30% of missed-focus shots in the quintessential setting of a bicycle approaching in zig zag. I’m sorry but R5 is clearly a compromise between sports and high-res, and not a very good one at that. Look at D850 or a7r4 and you will find both amazing resolution(without AA filter) AND very good autofocus.(3D tracking / real time tracking)

Yeah, and it's not like the guys complaining about it over on FM are novice birders. Some of those guys are extremely good so if they're complaining it must be pretty bad.

Link | Posted on Jul 16, 2020 at 14:12 UTC
Total: 580, showing: 1 – 20
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