Artak Hambarian

Lives in Armenia Yerevan, Armenia
Works as a Professor
Joined on Jan 3, 2009
About me:

Architecture, Energy, Environment, Beauty

Comments

Total: 177, showing: 1 – 20
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Nikon:
- make a little bit thick cell phone with optical zoom lens, so that I do not need to carry both cell phone and p330;
- in all dslrs and mirrorless put full cell phone connectivity with at least two sim cards and normal wifi;
- make a decent stereo camera with a decent viewer - although small, but will kill the stumbling fake VR businesses. You will be at least in a small market, but again a king, like in pro dslr.

Link | Posted on Feb 28, 2017 at 21:36 UTC as 61st comment

This is really pity. I have been waiting for the release date to purchase the DL 24-85 to keep it all the time with me.

Link | Posted on Feb 15, 2017 at 13:17 UTC as 25th comment | 3 replies
On photo White Pocket Frozen Pond in the Rock Pools challenge (5 comments in total)

Impressive! Is there HDR implemented?

Link | Posted on Jan 21, 2017 at 20:55 UTC as 2nd comment
On article TwoEyes VR stereoscopic camera simulates human vision (52 comments in total)
In reply to:

Ace of Sevens: How is this going to work? It would give you a stereoscopic view when facing the same direction as the cameras, but I don't see how it gives you the right data to construct a stereoscopic view any other direction.

Thank you! The Facebook one conceptually seems more correct, price aside certainly. I personally would be totally happy with straightforward, high quality binocular camera and a matching viewer... Neither 360 ability nor the related VR are of first importance for me - maybe later?

Link | Posted on Jan 20, 2017 at 20:51 UTC
On article TwoEyes VR stereoscopic camera simulates human vision (52 comments in total)
In reply to:

Menneisyys: 360-degree 3D video with two cameras, even when they're spaced quite far from each other?

This won't produce very good 3D video. You'll only have true 3D vision right in front of you (and on the back). On the sides, you'll have much less or even none. In this regards, other solutions using much more cameras (e.g., the Vuze camera) are really superior.

Menneisyys, I agree and very clearly understand your point. My point is that I personally would be interested in front sterescopic camera, even without VR, i.e. head turning feature, rather than in "monoscopic" VR. I have the Fuji 3d camera, but can only view stereoscopic images on its raster screen, or a 3d hd tv via polarized glasses, and yes, also via the headsets, where one inserts a smartphone. Neither are good and the camera is not good either...

Link | Posted on Jan 20, 2017 at 20:33 UTC
On article TwoEyes VR stereoscopic camera simulates human vision (52 comments in total)
In reply to:

Ace of Sevens: How is this going to work? It would give you a stereoscopic view when facing the same direction as the cameras, but I don't see how it gives you the right data to construct a stereoscopic view any other direction.

Menneisyys, which camera over $ 1000 do you mean? I did not know that there were any real stereo VR cameras...

Link | Posted on Jan 20, 2017 at 20:20 UTC
On article TwoEyes VR stereoscopic camera simulates human vision (52 comments in total)
In reply to:

Menneisyys: 360-degree 3D video with two cameras, even when they're spaced quite far from each other?

This won't produce very good 3D video. You'll only have true 3D vision right in front of you (and on the back). On the sides, you'll have much less or even none. In this regards, other solutions using much more cameras (e.g., the Vuze camera) are really superior.

... right in front of you, but very 3D natural. I personally am not excited by non binocular, i.e. "monocular" VR. Just the ability to turn your head and see what is there is not enough IMHO.

Link | Posted on Jan 20, 2017 at 19:11 UTC
On article TwoEyes VR stereoscopic camera simulates human vision (52 comments in total)

Finally! Something that is very unticipated. Looking forward for further development. Even more interesting would be a 4k stereoscopic viewer, later followed by 8k viewer.

Link | Posted on Jan 20, 2017 at 19:06 UTC as 10th comment | 1 reply
On article Fotodiox LED100WB-56 quick review (56 comments in total)
In reply to:

Julia Borg: CRI does not characterize LEDs well enough. have you tried measuring SPD?

Yes, OK, you are right. My point is that all three are attempts to express metamerism in one number, neither complete or perfect. And you are right that SPD characterises best, but there is no easy way to come to a conclusion by looking at SPD, except its "resemblance" to BBR SPD. Besides, this resemblance is also somehow taken into account in those complex indexes, but they remain not perfect - at least there is a lot of argument in this regard.

Link | Posted on Jan 16, 2017 at 21:15 UTC
On article Fotodiox LED100WB-56 quick review (56 comments in total)
In reply to:

Julia Borg: CRI does not characterize LEDs well enough. have you tried measuring SPD?

SPD = spectral power distribution of the light source, which is not just one number, but is a curve, and is more complex to interpret. What happens with low CRI illumination is the so called "metameric failure" = color distortion, reason of which is the distorted and spiky SPD, compared to a black body radiator such as sun or tungsten filament which are smoother and familiar to human eyes.

Link | Posted on Jan 15, 2017 at 20:31 UTC
On article Happy Holidays from DPReview (150 comments in total)

Instead of deleting I would add mine:
Merry Christmas/Happy Holidays/Season's Greetings/Happy Hanukkah/Merry Festivus/Shnorhavor Nor Tari!

Link | Posted on Dec 25, 2016 at 21:25 UTC as 77th comment

However, although it is not suited for panoramas - the vertical and horizontal axes do not meet, but it avoids the uncontrolled freedom of the ballhead, and brings all motions into orthogonal coordination. Also, in contrast to other gimbals, it has smooth movements and easier locking levers. Be it suited for panorama work, I would go for it.

Link | Posted on Dec 14, 2016 at 22:11 UTC as 16th comment
On photo Citizen Eco-Drive in the Product Photography challenge (1 comment in total)

David, the second hand indicates 9 or 10 seconds and not 20 seconds of the exposure!

Link | Posted on Dec 12, 2016 at 05:59 UTC as 1st comment
On article Canon patent shows curved sensor design (106 comments in total)
In reply to:

AstroStan: This has prompted me to ponder the physics of vignette. It is possible to mathematically model the lens and imaging plane or semi-sphere then compare that to real-world results (e.g. "flat field" frame). There are 4 primary components of photon-flux per area attenuation:

1) aperture transmission. This varies geometrically with angle of incidence. e.g. circular at perpendicular and a decreasing area ellipse with increasing angle of incidence,

2) geometrical distortions of the lens. Pincushion or barrel, etc. distortions change the flux per area (measured at the plane or semi-sphere).

3) geometry of the focal plane / semi-sphere / bent-plane (etc.).

4) pixel angular attenuation due to cicuit structures and/or micro lenses.

Issues 1-3 are not a simple calculation but the basic geometry is not that difficult. Issue 4 cannot be predicted without insider knowledge. But it can be measured indirectly by solving 1-3 and comparing to flat-image.

I may give it a go. Anyone else?

Stan

OK I see, but spherical sensor automatically address number 4 too, with the same projection token. If I understand correctly, you mean that incidence under angle make problems with all the light reaching the p-n-junction plane or close to it.

Link | Posted on Dec 3, 2016 at 21:31 UTC
On article Canon patent shows curved sensor design (106 comments in total)
In reply to:

AstroStan: This has prompted me to ponder the physics of vignette. It is possible to mathematically model the lens and imaging plane or semi-sphere then compare that to real-world results (e.g. "flat field" frame). There are 4 primary components of photon-flux per area attenuation:

1) aperture transmission. This varies geometrically with angle of incidence. e.g. circular at perpendicular and a decreasing area ellipse with increasing angle of incidence,

2) geometrical distortions of the lens. Pincushion or barrel, etc. distortions change the flux per area (measured at the plane or semi-sphere).

3) geometry of the focal plane / semi-sphere / bent-plane (etc.).

4) pixel angular attenuation due to cicuit structures and/or micro lenses.

Issues 1-3 are not a simple calculation but the basic geometry is not that difficult. Issue 4 cannot be predicted without insider knowledge. But it can be measured indirectly by solving 1-3 and comparing to flat-image.

I may give it a go. Anyone else?

Stan

Number 4 is very similar to sun tracking solar panel vs. fixed. Geometry is very simple - the cosine of the projection.

Link | Posted on Dec 3, 2016 at 20:34 UTC
On article Canon patent shows curved sensor design (106 comments in total)

Let's look a bit, just a bit further future. No doubt spherical sensors should be the main technology. As well as the Foveon type sensors. I mean the combination of both. Just wait a few more years... Whatever is the fixed cost of the R&D, it will pay back via advantage obtained in the market.

Link | Posted on Dec 3, 2016 at 20:32 UTC as 14th comment
On article Slik Lite tripods feature built-in LED lights (46 comments in total)
In reply to:

entoman: Oh no, how did we ever manage before!

What's next on the list - an LCD panel indicating the current height of the tripod and the number of leg sections unfolded?

If you think, that is just a joke, entoman, just wait a few years...

Link | Posted on Dec 1, 2016 at 21:37 UTC
On article Slik Lite tripods feature built-in LED lights (46 comments in total)
In reply to:

Melchiorum: I have to charge/change batteries on my camera, my two flashes, my phone, my video light, my radio mic, my gimbal... Yeah, charging my freaking tripod too is just what I was missing!

You do not have to if you do not need to.

Link | Posted on Dec 1, 2016 at 21:33 UTC
On article Slik Lite tripods feature built-in LED lights (46 comments in total)

Clever.

Link | Posted on Dec 1, 2016 at 21:32 UTC as 18th comment
On article Manfrotto launches stylish Windsor Collection bags (60 comments in total)
In reply to:

Scottelly: It amazes me they say the backpack can handle a camera with a big lens and two extra lenses. I have three DSLR style cameras in my backpack, and each one has a lens on it (one lens is a 100-300mm and one is a big wide-angle lens). I also keep my tripod INSIDE my backpack, with the cameras and lenses. I have lots of other stuff in that backpack too. I carry my 13" MacBook Air with my power supply in the backpack too.

The funny thing is that my backpack is not a big one. It's not a small one either, but it doesn't even compare in size with the big backpack my photographer friend has.

Why can't this new backpack from Manfrotto carry more stuff?

Thank you Scottelly! I am looking for a backpack that can accommodate a tripod. Can I ask the models of your backpack and the tripod? I consider a flat tripod, and Fstop gear backpack that may allow carying it inside, next to ICU.

Link | Posted on Nov 21, 2016 at 22:12 UTC
Total: 177, showing: 1 – 20
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