random78

Joined on Jun 3, 2010

Comments

Total: 266, showing: 1 – 20
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In reply to:

Bas Bridges: GoPro's death struggle...

@Mariano Pacifico: GoPro is not a victim of cell phone cams. Unlike DSLRs, the action camera market has been growing rapidly in recent years and is expected to grow further in coming years. However GoPro is struggling because of its inability to maintain any differentiation over a number of competing products that are in the market. GoPro was a great idea when it launched but its also an idea that is relatively easy to copy by others and GoPro has failed to evolve the product in a way where it could maintain an edge over competitors.

Link | Posted on Apr 19, 2018 at 15:49 UTC
In reply to:

Rensol: 0.2 sec?
Really?
Nikon 1 j1 had slow motion (high frame recording). 1j4, 5 have about 1000 frames per sec for couple seconds and you can pick up new kit for $300 on ebay!

Nikon 1 J5 offered the 1200 FPS at a very low resolution i.e. 400x144. The S9 is full HD, which is about 40 times higher resolution.

Also in J5, the slo mo mode just picks up a tiny crop from the frame and not the entire view - not a useful mode in practice

Link | Posted on Apr 5, 2018 at 22:21 UTC
In reply to:

JanMatthys: Why write a lengthy article when that awsome 4x chart explains it all?

@ DualSystemGuy: Exmor R is not stacked, it is just back-side illuminated. The Exmor RS is the later version which is stacked. However RS stacks only the sensor and the read circuitry -- which is what the diagram in the article shows as "before". So the new thing as indicated in the diagram is that the DRAM is also now stacked which will reduce the time to transfer data to the memory and hence deliver even faster readout time.

Sony also released such a 3-layer stacked sensor last year in their ZX phones as indicated in the article. So it is not quite the first time this technology has been demonstrated in a smartphone but it is nevertheless very recent and cutting edge. I believe apart from the Samsung S9 phones only the Sony Xperia XZ phones have such a sensor at this point.

Link | Posted on Apr 5, 2018 at 19:58 UTC
On article Sigma interview: 'This is just the beginning' (339 comments in total)
In reply to:

Jonathan Brady: I imagine if you asked the 3 interviewees from the other article to say 1 nice thing about each of their competitors, they'd freeze in place, begin to convulse, and then their heads would explode.
This guy? He PROACTIVELY does that!

@AbrasiveReducer: Sure, but still praising the 35mm 1.4 II from canon when their own 35mm 1.4 is directly competing against that lens is quite surprising and frank. The 35mm 1.4 is one of the most popular and highly rated Sigma lenses in recent past. Similarly praising the 28-75mm f2.8 from Tamron is quite surprising -- Tamron is also a third-party vendor like Sigma and not an OEM.

Mentioning Sony 12-24mm and 16-35mm f2.8 would be less surprising since Sigma doesn't have direct competitors to those lenses right now.

Link | Posted on Mar 19, 2018 at 19:18 UTC
In reply to:

sts2: As uMad said the lack of an FP shutter means you can only use the electronic shutter with these lenses. Which isn't very spectacular on the X1D, and forget about using flash as well (which is actually one of the main appeals of the X1D because of its leaf shutter).
So nothing to get too excited over. You're better off with native lenses by a long shot.

Or use Fuji GFX 50s which does have FP shutter and people are already using FF lenses on it.

Link | Posted on Mar 8, 2018 at 22:34 UTC
In reply to:

tko: " then automatically pivot forward or backwards for the best quality of light"

Make. Absolutely. No. Sense.

What are they saying? That there is an optimum angle like 33.5 degrees for bounce? Is so, and I don't believe there is, any one who plays pool can estimate this much faster than the camera can calculate it. Sounds like a marketing feature for beginners. I love it when machines are much slower than the people using them.

You missed the part of the article where it says that it first uses a straight-on flash to measure the distance to the object and then uses that to figure out the angle. So its not some fixed optimal angle that is built-in. Of course I have no idea how effective this whole approach is and whether it is only useful for beginners or also for people already experienced with bound flash.

Link | Posted on Feb 26, 2018 at 17:05 UTC
In reply to:

Brev00: I think the emphasis on value in the brief DPReview post assumes performance from the lens equal to or greater than the Nikon. That remains to be seen. But, I think we are all interested in the eventual comparisons. I will wait for them before I conclude anything. I do like Sigma's ambitions.

@Brev00: I didn't mean to disagree with your point. You are right that until we see actual performance we cant make an objective determination.

Link | Posted on Feb 23, 2018 at 21:16 UTC
In reply to:

Lee Jay: I'm interested in how the color awareness will be created. Recording each individual photon is cool, recording when it arrives is cooler yet, but being able to record its precise wavelength would be astounding. How would that happen?

@Lee Jay: The point is zero read noise, which will be enabled by this approach regardless of whether there is a color filter array or not. We all would love to have a solution where the color filter array is not needed and no light is discarded. However that is a separate problem from the problem that this invention is trying to solve.

Link | Posted on Feb 23, 2018 at 21:11 UTC
In reply to:

Lee Jay: I'm interested in how the color awareness will be created. Recording each individual photon is cool, recording when it arrives is cooler yet, but being able to record its precise wavelength would be astounding. How would that happen?

The current color filter array will work fine with this approach - no issues there. The color filter array blocks photons of certain 'color' i.e. energies and lets only photons of a certain energy range go through. So each jolt will be detecting photons of a specific 'color' depending on the filter on its top.

Link | Posted on Feb 23, 2018 at 16:46 UTC
In reply to:

Brev00: I think the emphasis on value in the brief DPReview post assumes performance from the lens equal to or greater than the Nikon. That remains to be seen. But, I think we are all interested in the eventual comparisons. I will wait for them before I conclude anything. I do like Sigma's ambitions.

Lens performance has many different aspects and as often happens in such comparisons, first lens might be better in some aspects and second might be better in other aspects. So those who favor Nikon version will point to areas where Nikon version is better and will say that third-party lenses can come close but OEM lenses are stilll superior. Those who favor Sigma will point to areas where Sigma is equal or superior to Nikon and talk about how Sigma is delivering better-than-Nikon performance at much lower cost and how Nikon is ripping us off. And the two groups will still keep fighting no matter how many performance comparisons you do :)

Link | Posted on Feb 23, 2018 at 16:31 UTC
In reply to:

Mike CH: I certainly hope the new lenses produce less moire than in the product shots!

How could a lens produce moire? Moire is produced by the camera sensor, not lens.

Link | Posted on Feb 23, 2018 at 01:29 UTC
In reply to:

noisephotographer: All the time there are comments that Google phones can't compete with real cameras and that even 1" sensor cameras are much better. That's extremely misleading.
I wonder if these people ever tried a Google HDR+ phone camera. Most people take auto mode JPGs and don't shoot raw in manual mode and it's unreasonable to expect the opposite. When you compare auto mode wide angle jpgs, then most cameras (1", Aps-c, full frame) deliver MUCH worse results: Blown out highlights, much worse dynamic range, bad noise reduction, worse white balance, etc.. I wonder how many people want to live in the past. Large sensor + large aperture can be useless if image processing, white balance, color profile, lens quality and the auto mode algorithms are so much worse. A good example is this: https://www.dpreview.com/files/p/articles/9532444565/exposure1.png

I agree that poor exposure, white balance etc can easily offset the advantages of a big sensor. It is also true that high-end phone cameras generally tend to be very good at these aspects. However I disagree with your assertion that "When you compare auto mode wide angle jpgs, then most cameras (1", Aps-c, full frame) deliver MUCH worse results". My 1" camera, DSLR and mirrorless are all great at getting the right exposure in auto mode and features like HDR mode are also available in the mirrorless camera as well as the 1" camera. And the results are certainly better than my premium phone camera if I look closely. However saying that the phone results are very good now and I often don't carry even my 1" camera on most casual outings.

Link | Posted on Feb 12, 2018 at 19:21 UTC

I must say that the first picture in the article with the caption "The Pixel 2 offers excellent image quality ....." would be one of the worst examples to convince someone on image quality. It is a muddy, noisy shot. There are several other shots in the gallery which are much better -- not sure what dpreview guys were thinking when they decided to use this photo to showcase 'excellent image quality'.

Link | Posted on Feb 12, 2018 at 18:52 UTC as 54th comment
In reply to:

Shlomo Goldwasser: Worried about track erosion caused by tripods. This is just crazy.

I love when park management has no clue what they are on about and introduce these rediculous ideas. I can only say that if they want to be strict about rules you should be strict in interpreting them. Just get a quadrupod and you can use it anywhere you like.

@falconeyes: I have no idea that at what size, the group size becomes a problem for them. Nevertheless a group hiking on the trail is very different from a group stopping to setup their tripods. When people are hiking in a group they are generally going in a line with at max 2 or 3 people together. Whereas when a group stops to take a pictures, they are all at the same spot trying to take the picture from the same vantage point and each needs space to setup their tripod without their view being blocked by anyone else. So it is a very different formation then a group hiking.

Link | Posted on Jan 31, 2018 at 20:11 UTC
In reply to:

Shlomo Goldwasser: Worried about track erosion caused by tripods. This is just crazy.

I love when park management has no clue what they are on about and introduce these rediculous ideas. I can only say that if they want to be strict about rules you should be strict in interpreting them. Just get a quadrupod and you can use it anywhere you like.

They are not worried about track erosion due to tripods. They are worried about a large groups of people (part of a workshop), stopping in the middle of a trail and setting up their tripod to take pictures. A trail is not wide enough to have a large group standing together and setting up their tripods. So the implication is that in such a scenario the participants in the group will setup their equipment off the trail, on the sides trampling the plants and causing other damage. The other issue is that it will block other people on the trail.

Both of these seem very valid concerns. It makes sense that this should not be allowed on the trail itself and only in areas where you have clearing off the trail for a group to stand and setup their equipment.

Link | Posted on Jan 31, 2018 at 19:16 UTC
In reply to:

WongFeiHong: So the guy who posted this shot is also part of destroying the iconic tree and telling others not to follow suit, is this new level of stupidity.

@Roland Karlsson: As Tronhar said, it depends on whether the guy on the tree and the photographer are connected. If they are connected, then the photographer is indeed responsible for the damage. However we cant tell from this picture if thats the case or not

Link | Posted on Jan 30, 2018 at 07:15 UTC
In reply to:

WongFeiHong: So the guy who posted this shot is also part of destroying the iconic tree and telling others not to follow suit, is this new level of stupidity.

@Ranger Danger: I understand remote shutters and self-timers. However given the setting it seems quite unlikely that it is the photographer himself who first setup the shot and then made his way across the lake to get to the tree and be in the frame. It is much more likely that the guy on the tree is someone else.

Link | Posted on Jan 30, 2018 at 07:07 UTC
In reply to:

WongFeiHong: So the guy who posted this shot is also part of destroying the iconic tree and telling others not to follow suit, is this new level of stupidity.

Clearly the guy on the tree can't be the guy taking the shot. So what makes you say that the guy taking the shot damaged the tree?

Link | Posted on Jan 29, 2018 at 22:51 UTC
In reply to:

desertsp: Not a lens engineer....but it seems like the optical quality of these would be WAY worse than a traditional multi-element glass lens.

Maybe the low mass and thickness, combined with rapid computational processing, opens up new possibilities though. I could imagine a solution where these tiny lenses are very rapidly shifted to project the image onto the sensor from slightly different angles, while the sensor captures dozens or hundreds of impressions in a fraction of a second, which are then merged into a high quality photo. Kind of like the sensor-shift technology for adding resolution, but shifting the lens instead.

And why can't you not use a multi-element structure consisting of multiple of these mata-lenses?

Link | Posted on Jan 5, 2018 at 03:07 UTC
In reply to:

Blaklynx01: "Sure, these flat lenses are 100,000x thinner than glass,..."

What does this mean? Glass can be varying thickness. 100,000x thinner than 1.0mm glass or 100,000x thinner than 20mm glass?

Anybody?

I would assumed they are comparing the thickness of glass needed to focus light to a certain distance vs the thickness of meta-lens needed to focus the light to the same distance.

Link | Posted on Jan 5, 2018 at 03:05 UTC
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