Dan Tong

Lives in United States Chicago, United States
Works as a Computer Consultant, Photographer
Joined on Jan 3, 2003
About me:

Olympus 2100UZ
Minolta Dimage 7i
Canon S400
Canon EOS 300D


Total: 229, showing: 81 – 100
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On article Travel tripods: Comparing 5 aluminum kits (112 comments in total)
In reply to:

Artak Hambarian: Very welcome review, since it tries to make a measurable comparison, finally. I have read also a German article on a similar comparison of Feisol, Manfrotto and Gitzo Tripods through a laser pointer mounted on the tripod. I would like to suggest to share more details, so that anyone could make a similar comparison:
1. Shape of the aluminum block and the way it and the ipad are mounted.
2. data on solenoid hammer - power rating, core weight, voltage, etc.
3. Where exactly the vibration is applied - mm-s from the ground.
4. Name the seismometer app used.
5. Try spikes, extend column, etc. A photograph of the setup is very very welcome.
In fact DPReview can end the "endless" and meaningless increase of the weight rating by manufacturers by setting standards for tests!

Your review is excellent, very detailed and very much appreciated. I only have one suggestion that would make it even better.

It would be EXTREMELY useful to have a single graph summarizing the vibration tests. It's very difficult to make the comparison otherwise (one would have to flip back and forth between each graph). For example you could normalize the some of the values (perhaps averaged over a standard time period) and then present it all in a bar graph with different colors for each brand of tripod. Because these measurements are very unfamiliar to just about everyone, the values do not have much meaning to most photographers, hence the need for RELATIVE comparisons.

Link | Posted on Jul 22, 2014 at 21:09 UTC
On article CreativeLive to host free one-day event with Art Wolfe (33 comments in total)
In reply to:

jaykumarr: I am not able to see this live video.. will it be of great quality when i try after payment?

Absolutely fantastic HD quality streaming and you can download it.
The content is superb and pedagogically far better than just about any video seminar I have watched.

Don't listen to the naysayers, who talk big and when you look at their images, you realize they have never learned much about anything except being negative.

Link | Posted on Jul 21, 2014 at 00:45 UTC
On article CreativeLive to host free one-day event with Art Wolfe (33 comments in total)

It's excellent and here's a photographer who isn't limited to landscapes only, but follows his inspiration to any place it takes him.

Because Art Wolfe always views photos from the point of view of the general purpose graphic artist, and far less about technical details I found these tutorials far more helpful than other's I have viewed.

I also thought that the critiques of student work was especially good, even if some have commented that it is somewhat repetitious. It is repetitious because students keep making the same goofy things (lack of dominant subject leadingto too many competing objects and areas, poor framing etc.)

I highly recommend this incredibly great video seminar! Absolutely worth $49 to purchase or $59 without the special discount. I purchased it.

Link | Posted on Jul 21, 2014 at 00:42 UTC as 3rd comment
On article A GoPro Hero's journey into a dishwasher (164 comments in total)


Wow, fantastic!
Great job, perfect exposure, framing, casting etc.

I never knew how these things worked.
Congratulations to you. Inquiring minds work in creative ways.

Hope this does not invalidate your GoPro warranty. Maybe they would like to license it from you and use it for promotional work.

Perhaps you could use a more catchy title like:

COMING CLEAN - The Inside Story

Thanks it's wonderful!


Link | Posted on Jun 5, 2014 at 19:51 UTC as 33rd comment

Great stuff and the video is very pretty too!

Link | Posted on May 24, 2014 at 19:25 UTC as 14th comment
On article Light Field Cameras - Focusing on the Future (142 comments in total)

Interesting as usual, especially the idea of light field microscopy to compute three dimensional volumes of tiny transparent things, as well as use in video in the future.

iBut beware of the always negative, thoughtless..let's be honest, the stupidly unimaginative, commentary -almost always from people who don't understand the idea of lightfield imaging in the first place.

It wasn't that long ago that a hot shot engineer on dpreview said that based on his calculations sensor based stabilization would never work with larger sensors (APS C or Full frame), or the shortsighted people who thought that adding video to a still camera was a total waste of time and nobody would be much interested in it.

Why is it that if people are not interested in something, or some feature of a new camera, then they think that no one else could possibly be interested?

Perhaps others can add some additional technology that was believed to be just another useless waste of time...

Link | Posted on May 16, 2014 at 05:44 UTC as 38th comment
On article Light Field Cameras - Focusing on the Future (142 comments in total)
In reply to:

Lan: The question is, is it an intestine to use? ;)

Yes, it definitely takes intestinal fortitude to use :)

Link | Posted on May 16, 2014 at 05:34 UTC
On article Is it true? New service detects processed photos (89 comments in total)
In reply to:

disraeli demon: The problem with this is the inability to distinguish between the sort of processing that has no effect on authenticity (white balance, colour profile, levels/curves) and significant modifications such as compositing.

For the verification to really be of use, you'd ideally need checkboxes that let you declare what changes you've made before evaluation (colour/contrast as above, conversion to black & white, JPEG conversion from RAW), and have the site confirm that nothing ELSE was done.

Yours is the most concise and rational comment on this topic other than BobOrama's excellent comment on why authentication is important in some cases.

Link | Posted on May 9, 2014 at 22:21 UTC

BlackMagic is certainly innovative. They're potentially doing what RED has done.

A modular camera which allows replacing/upgrading the sensor, and the lens mount. This is really good and only RED has done it before at prices lower than the then available competition.

Of course, this BlackMagic video camera is far cheaper than any of RED's offerings.

Having a 10" display is Wonderful. Now you can really see what you're looking at. Totally different than a 3" or 3.5" monitor.

BlackMagic is paying attention to independent filmmakers working on a small budget, so pricing below $6k is very impressive, yet this is a tool for serious video production. I expect this camera to be very, very popular.

Congratulations Black Magic !

Link | Posted on Apr 8, 2014 at 22:59 UTC as 6th comment | 1 reply
In reply to:

brycesteiner: I don't get this:
"Introducing the world’s first digital film camera ..."

What does "digital film" mean? Oh sure, it's for the cinema, but there is no film anymore in the theatres. Right?

It would be cool to have a camera that could record to digital and film at same time!!!

Do you have any idea how much film stock costs?

Link | Posted on Apr 8, 2014 at 22:47 UTC

HDR is an attempt to properly expose various parts of a photographic shot. Of course our eyes do this without our awareness because sensitivity is controlled locally in the retina as well as the fact that the eye scans a scene and does not necessary stay locked in position, so that the eye can adjust to local variation in brightness.

We also need to keep in mind, that the eye's highest acuity region (the fovea) is always brought to bear on areas of interest in the visual field.

Surprisingly, the eye has a built-in constant, micro-tremor,, which when eliminated (stabilized images in laboratory experiments done with people) leads to the disappearance of the image altogether.

Hence Olympus's idea once again gets us a bit closer to the "perfection" of biological visual performance -extremely fast, focusing, rapid auto exposure.

Link | Posted on Mar 15, 2014 at 18:06 UTC as 28th comment | 5 replies
On article Engineering a Difference: Benjamin Von Wong Part 2 (39 comments in total)
In reply to:

Eric Calabros: Looks more CGI Art than Photography

Partly it is because you can see major Photoshop touch ups with increased local contrast stuff.

Link | Posted on Mar 15, 2014 at 17:49 UTC
On article Engineering a Difference: Benjamin Von Wong Part 2 (39 comments in total)
In reply to:

Lee Jay: To me, a carefully preplanned setup shot is just as bad as CGI. Neither one is real or spontaneous and they look equally fake.

Lee Jay,

"Just as bad as CGI" Why is CGI bad?
Nothing wrong with CGI, perhaps you have never done any CGI. It takes a lot more work and talent than a lot of "photographic art".

Also, your assumption that real or spontaneous is what makes great Art is also questionable. Many paintings are not "real" and most painting are not spontaneous".
Much art is preplanned. Great films are pre-planned.
I suggest you think a bit before you post such nonsense.

Link | Posted on Mar 15, 2014 at 17:47 UTC
On article Cinetics Axis360 review (69 comments in total)

A useful review, however, why the extreme wide angle with all of it's distortions in all of the videos?

I can understand the need in really small spaces but not outdoors etc.


Link | Posted on Feb 26, 2014 at 02:08 UTC as 25th comment | 3 replies

These are some of the best photos on Dpreview in my opinion. Everything about them is gorgeous -Technically as well as Artistically and therefore Emotionally. You can't ask for more.

Absolutely Beautiful. Elena Shumilova is a photographer's photographer.

Congratulations !

Link | Posted on Jan 27, 2014 at 22:00 UTC as 73rd comment

It's good to hear that at least one company is not content to sit back and only work with currently accepted sensor design. Constant re-thinking is the crucial factor behind all of the innovation that improves technology. Of course, some lead to dead ends, or are superior, but market forces sometimes, though not often, cause inferior technology to win out.

Keep in mind that the primate visual system uses receptor arrays, and that the receptive fields of ganglion cells (which constitute the output of the optic nerve) vary a lot in size, sensitivity, and distribution. The optic nerve provides the input for additional processing, to the rest of the "brain".

The visual system works a lot better than any current digital imaging system (signal to noise, rapid accurate focusing etc.), so obviously we have far to go, to even catch up.

Most of the negative comments about many innovations, generally appear to come from people who don't really understand much of what is being discussed.

Link | Posted on Jan 24, 2014 at 23:28 UTC as 20th comment | 8 replies
On article Backstory of Phantom Flex4K video shot at 1,000 FPS (91 comments in total)

Thanks for posting this. Amazing.

Link | Posted on Dec 15, 2013 at 22:08 UTC as 23rd comment

This reflects very poorly on an otherwise great, innovative company like Nikon.
I hope they rapidly correct this very stupid move.

Link | Posted on Dec 11, 2013 at 18:56 UTC as 25th comment
On article Adobe hack affects 38 million users, not 2.9 million (156 comments in total)
In reply to:

Marla: I just purchased (local store) a copy of PSElements. Am I correct in assuming uploading and using this on my pc will not be a problem if I do not register it. Correct?


You're right.

Link | Posted on Nov 1, 2013 at 21:48 UTC
On article Adobe hack affects 38 million users, not 2.9 million (156 comments in total)
In reply to:

drdancm: I'm currently still on hold with Experian who is the provider for the complementary 1 yr credit monitoring. This is the fourth time I am on the phone with them and they are still unable to get me to login under my newly created account, at protectmyid.com.

I have wasted at least 4 hrs on the computer and on the phone. It has been 3 days that I have been unable to get the account working. I spoke with 3 different very nice reps who have done all they know to fix the problem but I still get the same message that my login is unsuccessful and I need to either e-mail support or call them at the provided phone number.

Day 5 and Experian tech support left a message telling me to call them at a different phone number. I did, and it got me to the same non-tech support people who once again sent me a new temp password which failed the exact same way.
I heard on the news that Experian was screwing up with authenticating the Affordable Care web site stuff -as if that effort wasn't having enough competency problems.
However, Experian supervisor told me that my account is monitored, even though I cannot login, and that if any suspicious activity is detected they will send an e-mail. I asked her to look and she said there wasn't anything suspicious at this point.

Link | Posted on Nov 1, 2013 at 21:46 UTC
Total: 229, showing: 81 – 100
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