Gao Gao

Gao Gao

Lives in Singapore Singapore
Works as a student
Joined on Feb 22, 2003

Comments

Total: 36, showing: 21 – 36
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On Sony DSC-RX100 preview (544 comments in total)
In reply to:

semorg: 20MP? I'll pass!

If sony built this for the enthusiast market, then they missed the mark. Put the same sensor on a 10-12mp camera with much better iso performance, and I'll be talking with my wallet

Note that this is a BSI sensor, where pixel pitch has a much smaller impact on the overall image quality. From the samples we see, it's about 1 stop noisier than the best APSc sensors. Consider the size of sensor and lens aperture, it actually performs quite a bit above the equivalence line.

Direct link | Posted on Jun 6, 2012 at 06:37 UTC
On Just Posted: Sony DSC-RX100 preview with sample images news story (645 comments in total)

Wait... why did I get E-M5 with 12-50 again?

Direct link | Posted on Jun 6, 2012 at 06:29 UTC as 141st comment
On Just Posted: Olympus M.Zuiko Digital ED 75mm F1.8 Preview news story (185 comments in total)
In reply to:

waxwaine: If I remember the idea of m43 was "Go compact", and this is not a very good example. No point on this compared to any APS-C camera.

Not bad. At least a bit smaller and lighter than the EF 135/2.8

Direct link | Posted on May 25, 2012 at 07:29 UTC
On Olympus M.Zuiko Digital ED 75mm F1.8 Preview preview (212 comments in total)
In reply to:

Mssimo: My 2 cents

75mm F1.8 has the same DOF no matter what format camera its mounted on.

DOF of this lens is perfect for portraits.

No need to stop it down.

Lots of special glass reduces the need for post corrections.

You get what you pay for and this lens is worth every penny and it will not drop in price for a long time.

DoF is based on the entire image - two pictures need to have the same perspective and field of view to be comparable.

Direct link | Posted on May 25, 2012 at 07:21 UTC
On Olympus M.Zuiko Digital ED 75mm F1.8 Preview preview (212 comments in total)
In reply to:

love_them_all: 150/3.5 eq isn't exactly attractive. Lenses just sound more exotic in the smaller sensors. 75/1.8 sounds so much more interesting. :) Although given a real 135/3.5 on the ff or this lens, I may get this lens because of the faster shutter speed. Noise and everything else put aside.

Sorry for being unclear - the 2 stops refer to matching the DoF under even brighter conditions, instead of the parameters I was using. 5D2 does have ISO 100 for that. I recall reading it somewhere in the forums that E-M5 requires 1/200 to be clear of any shutter shadows.

Still - I am seriously considering getting the E-M5 for the size, weight and AF speed.

Direct link | Posted on May 25, 2012 at 07:17 UTC
On Olympus M.Zuiko Digital ED 75mm F1.8 Preview preview (212 comments in total)
In reply to:

love_them_all: 150/3.5 eq isn't exactly attractive. Lenses just sound more exotic in the smaller sensors. 75/1.8 sounds so much more interesting. :) Although given a real 135/3.5 on the ff or this lens, I may get this lens because of the faster shutter speed. Noise and everything else put aside.

Faster shutter speed isn't always favorable though. Say, for example, strobist work often requires working under the x-sync speed. I shot an outdoor portrait session using 70-200/2.8 @ ISO 200, F/2.8, 1/160s on my 5D2 a couple of weeks ago. Although this 75/1.8 should give similar DoF, the shutter speed will exceed sync speed by two stops. Having to work with ND filters can be troublesome.

Direct link | Posted on May 25, 2012 at 04:46 UTC
In reply to:

Peiasdf: Very very bad per pixel sharpness. I still think Foveon or other 3D sensor idea is the future of small sensor photography.

Foveon needs some serious improvement in SNR, though.

Direct link | Posted on Feb 28, 2012 at 01:43 UTC
On IMG_0299 photo in dpreview review samples's photo gallery (3 comments in total)

Looks like the dynamic range hasn't really improved. Noise reduction is more heavy-handed but shadow quality is still behind those using Sony sensors.

Direct link | Posted on Jan 17, 2012 at 02:37 UTC as 3rd comment
On CES 2012: Lytro Photowalk article (140 comments in total)

So the standard mode is hyperfocal as expected and advanced mode is the sloppy auto-focus mode.

Direct link | Posted on Jan 14, 2012 at 03:21 UTC as 51st comment
On Preview:canong1x (1044 comments in total)
In reply to:

ogl: http://www.dpreview.com/reviews/sonydscr1/
R-1 had 24-120/2.8-4.8 with sensor size 21.5 x 14.4 mm
G1X has 28-112/2.8-5.8 with sensor size 18.7 x 14 mm

G1X is rather compact camera...but lens is not fast and not wide.

And it doesn't have a leaf shutter!

Posted on Jan 9, 2012 at 16:00 UTC
On Mirrorless Roundup 2011 article (429 comments in total)
In reply to:

jorepuusa: Lots of cameras, lots of comments about those cameras.
But the main thing is missing. The visual quality of pictures taken by dpreview staffers is bad! Pictures are sadly amateurish, composition is nonexistence and there is no story in the pics.
World leading site should have pleasing pictures of people holding cameras but it does not.
But neither do other sites. It is a saddening truth that sites writing about cameras use pictures that are of very low visual standard.
Now what does this mean?
It means that people who write these laughable comments about how wrong tests or roundups are, do not understand about pictures at all cause never are the pictures estimated in these sites. So the only thing that matters are the knobs and pixels and those have nothing to do with pictures.
Photography is really dying. This article and its comments are one proof about it.

This site is focused on helping photographers to find the suitable tool, not to teach or inspire photographic work. Pictures without much substance in photographic sense is actually preferred, since interesting photo content will bias the opinion on equipment.

Direct link | Posted on Dec 20, 2011 at 08:24 UTC
On Nikon releases four '1 Nikkor lenses' for Nikon 1 system news story (94 comments in total)

I wonder how much a 13mm F/0.75 will cost.

Direct link | Posted on Sep 21, 2011 at 06:03 UTC as 30th comment

Prices aren't cheap... Are they going to announce some sub-F/1 primes?

Direct link | Posted on Sep 21, 2011 at 05:58 UTC as 47th comment
On Preview:olympusep3 (155 comments in total)
In reply to:

Tim in upstate NY: Somebody tell me why the 45/1.8 is almost as small as the 12/2? The 45/1.8 has a much longer focal length and is faster but not significantly larger - I don't get it.

On SLR: 24/1.4 is larger than 50/1.4

Posted on Jun 30, 2011 at 09:50 UTC
In reply to:

Alex Panoiu: From page 60 of the thesis (http://www.lytro.com/renng-thesis.pdf) I understand that if each microlens covers m x m pixels and the image was taken at f/N then the image can be refocused anywhere in the depth of field of f/(N x m). For example, the image taken at f/4 and each microlens covers 8x8 pixels then the image can be refocused anywhere in the depth of field of f/32. This also means that spatial resolution is reduced by a factor of 256, say from 256 megapixels to 1 megapixel.

The tradeoff is that for each factor of 2 of loss in spatial resolution the "potential" depth of field increase corresponds with one step of aperture.

256? or 64?

Direct link | Posted on Jun 23, 2011 at 05:36 UTC
On Circle in the Creative photo editing challenge (5 comments in total)

are these dead hamsters?

Direct link | Posted on Jan 19, 2010 at 09:23 UTC as 2nd comment
Total: 36, showing: 21 – 36
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