Cheng Bao

Cheng Bao

Lives in United States United States
Joined on Oct 3, 2003

Comments

Total: 180, showing: 1 – 20
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Do you have shadow lifting test?
Since 750D/760D uses apparently differently packaged sensors, which hints it comes from a brand new fab lines. So, maybe DR is improved to modern standard

Direct link | Posted on May 20, 2015 at 17:08 UTC as 54th comment | 2 replies

what's the phenomena of these:
http://www.dpreview.com/galleries/reviewsamples/photos/3207741/dan_acr_iso200_f4?inalbum=fujifilm-xf-16mm-f-1-4-r-wr-samples-gallery
http://www.dpreview.com/galleries/reviewsamples/photos/3207208/dan_acr_iso200_f5-6?inalbum=fujifilm-xf-16mm-f-1-4-r-wr-samples-gallery
http://www.dpreview.com/galleries/reviewsamples/photos/3207742/dan_acr_iso200_f9?inalbum=fujifilm-xf-16mm-f-1-4-r-wr-samples-gallery

where orange lines against blue sky, I can see orange colored "halo" around lines.
Astigmatism?

Direct link | Posted on May 19, 2015 at 21:58 UTC as 10th comment | 6 replies
In reply to:

Jozef M: On the Canon website I find ISO values like 100, 200, 400, 800 .... no in between values in FW and in the samples gallery I see ISO 160 and 320 and 640 and so on, have Canon changed the firmware of those Rebels???

and actually, unlike other brands or canon's own 1D series camera, canon cameras don't provide hardware gains for intermediate ISO rating like ISO 160, 4000. Canon use software push up to get those intermediate ISO value from closest lower full stop ISO value, ie. from ISO100 to digitally pushed up to ISO 160, ISO 3200 to 4000. So, there is no real advantage to use those non-full-stop ISO value. I think that's why canon don't provide them on manual control

Direct link | Posted on May 19, 2015 at 15:53 UTC
In reply to:

vscd: I don't know. Does anyone else doubt in the 7mm focal length (14mm equiv)? If I compare it with my Samyang 14mm @fullframe I could swear the FOV is a lot wider. Hmm.

From spec, view angle
olympus 7-14@7mm, 114°
samyang 14mm, 115.7°
so, samyang is indeed a little wider.

Direct link | Posted on May 12, 2015 at 20:04 UTC
On Canon issues product advisory for Rebel T6i/T6s article (139 comments in total)
In reply to:

bigdaddave: But will Canon repair 'grey' market cameras free???

Canon USA recently publish a press release, that states they won't honor any warranty to grey market products. However, they may or may not honor warranty to grey market products on this specified issue.

Direct link | Posted on May 8, 2015 at 16:00 UTC
On Canon EOS 5DS R added to studio test scene comparison article (518 comments in total)
In reply to:

armandino: Wow Phase One is wild.
Working on both the 5Dr file and D810 at 100 iso the Canon shows to me a clear advantage on resolution/moire, not quite the same DR. Sort of expected. Said that ,+2 stop and +100% shadows is all I would really need and the 5D does no bad at all. Both are mazing tools and would be pleased with any. I think I rather have the extra resolution and less moire over the added DR for my work. But that is personal choice.

You can't judge moire, because different pixel count means different frequency threshold on moire.
i.e. http://www.dpreview.com/reviews/image-comparison/fullscreen?attr18=daylight&attr13_0=canon_eos5dsr&attr13_1=nikon_d810&attr13_2=pentax_645z&attr13_3=phaseone_iq180&attr15_0=raw&attr15_1=raw&attr15_2=raw&attr15_3=raw&attr16_0=100&attr16_1=100&attr16_2=100&attr16_3=35&normalization=full&widget=1&x=-0.656343738928473&y=0.12565162640823965

5DR shows much more moire on this area

Direct link | Posted on May 6, 2015 at 16:00 UTC
In reply to:

SmilerGrogan: If Sony make the bulk of sensors, why does DP Review bother testing so many different cameras.

When the same Sony sensor is used in Camera A, B, and C, wouldn't it be more efficient to just test Camera A and extrapolate to the others?

Plus that would free up staff time to review the more interesting and off-beat cameras out there (branch out into medium format cameras or finally review the many Pentaxes that are gathering dust in the equipment closet).

First, seems you trust 3rd party retailer's website more than olypmus' official website.

Second, do you realize that 16.1MP and 16.3MP both are qualified to be called 16MP? That's you why you see 16MP on retailers website.

Direct link | Posted on May 5, 2015 at 20:10 UTC
In reply to:

SmilerGrogan: If Sony make the bulk of sensors, why does DP Review bother testing so many different cameras.

When the same Sony sensor is used in Camera A, B, and C, wouldn't it be more efficient to just test Camera A and extrapolate to the others?

Plus that would free up staff time to review the more interesting and off-beat cameras out there (branch out into medium format cameras or finally review the many Pentaxes that are gathering dust in the equipment closet).

@HowaboutRAW
So basically you are saying, "I got no proof, and I will ignore any proof even what states on olympus official websites if it contradicts to my belief". Good luck with that.
also, if you look closely to specs on olympus official websites, there are only two resolutions on 16MP m4/3 body, 16.3 for e-m1 and 16.1 for everything else.

Direct link | Posted on May 5, 2015 at 17:11 UTC
In reply to:

SmilerGrogan: If Sony make the bulk of sensors, why does DP Review bother testing so many different cameras.

When the same Sony sensor is used in Camera A, B, and C, wouldn't it be more efficient to just test Camera A and extrapolate to the others?

Plus that would free up staff time to review the more interesting and off-beat cameras out there (branch out into medium format cameras or finally review the many Pentaxes that are gathering dust in the equipment closet).

Not E-m5 II? Do you have any proof?
All olympus 16MP m4/3s except E-M1, has identical sensor resolution and sizes, which is 16.10MP effective and 17.2MP total, while E-M1 has 16.3MP effetctive and 16.8MP total. It is safe to bet all of them except E-M1 has same sony sensors, unless you have solid proof said otherwise.

And olympus website shows all 8 of 16MP cameras are current in production.

Direct link | Posted on May 5, 2015 at 16:27 UTC
In reply to:

princecody: Who owns the other share of the market?

According to WSJ, omnivision and samsung got around 15% each company

Direct link | Posted on May 5, 2015 at 01:48 UTC
In reply to:

SmilerGrogan: If Sony make the bulk of sensors, why does DP Review bother testing so many different cameras.

When the same Sony sensor is used in Camera A, B, and C, wouldn't it be more efficient to just test Camera A and extrapolate to the others?

Plus that would free up staff time to review the more interesting and off-beat cameras out there (branch out into medium format cameras or finally review the many Pentaxes that are gathering dust in the equipment closet).

" Not too many Olympus m4/3s bodies use Sony sensors anymore."
All recent olympus m4/3s bodies, namely E-M5 II, E-PL7, E-M10, E-P5, E-PL6, E-M5 are using sony sensors, the only recent olympus m4/3 body not using sony sensor is E-M1.

Direct link | Posted on May 4, 2015 at 23:40 UTC

Hi, dpreview, care to include balis and loxia lines from Zeiss in your lenses database?

Direct link | Posted on Apr 23, 2015 at 16:49 UTC as 14th comment

dpr's lens database
http://www.dpreview.com/products/zeiss/lenses?subcategoryId=lenses&sort=Chronological&view=Grid

besides this Balis line, loxia line is not in dpr's database

Direct link | Posted on Apr 23, 2015 at 00:03 UTC as 34th comment
In reply to:

Combatmedic870: No pics of the cool a*s oled? Looks awesome!!! This is how digital lenses should be made from now on (except with aperture rings of coarse)!! Mix the oled tech with fuji lenses and they would be AWESOME!!!

It is lens who knows the current focus distance, not body.
Body only tell lens, focus is a little further, back off little, no you back off too much, go further then.

and body and lens need a protocol to tell the focus distance to body, and body need to display it or write it to exif.

Direct link | Posted on Apr 22, 2015 at 19:03 UTC

what's the min focus distance of 85/1.8?

Direct link | Posted on Apr 22, 2015 at 18:38 UTC as 65th comment | 2 replies
On Sony SLT-A77 II Review preview (499 comments in total)
In reply to:

Combatmedic870: Nice camera.

No word on the new FE Zeiss batis lenses just announced???? 25 and 85mm

They are beautiful!!!!

Hope you can get more details than B&H.
lens construction and MTF etc.
Zeiss only put a teaser page on their website.

Direct link | Posted on Apr 22, 2015 at 18:11 UTC
In reply to:

Vanitas Photo: While everybody is busy talking nonsense most didn't noticed that Sony has a medium format sensor listed

IMX161 50M Middle Format 5.3 3.3 sub LVDS 8ch RGB Middle Format Camera Exmor

Silly people...

Because people already know it exists.

Leaf, Hassel, Pentax have all directly or indirectly said their latest MF cmos cameras using a sony sensor, and it is safe to bet they are same model.

Direct link | Posted on Apr 20, 2015 at 17:07 UTC
In reply to:

GabrielZ: I think the new APS-C sensor is the one heading for the rumored Fujifilm X-Pro2! Here's hoping, looking forward to that camera a lot, as an X-E2 user myself.

all fujifilm aps-c body use a sony sensor. some of them just use a custom made color filter.

Direct link | Posted on Apr 19, 2015 at 16:28 UTC

I believe dpreview made a mistake when saying Stellar II was an RX100 III when reporting http://www.dpreview.com/articles/6269346635/hasselblad-introduces-stellar-ii-luxury-enthusiast-compact and then fix it.

Now the same mistake again?

Direct link | Posted on Apr 9, 2015 at 23:29 UTC as 81st comment
On Sony Alpha a7 II Review preview (806 comments in total)
In reply to:

creaDVty: In Part 5, you state "the a7 II attempts to acquire focus through the lens at or near whatever aperture you have set." You criticize this characteristic when apertures are narrower than f/8. I believe the reason for this characteristic is to be able to view the DOF in realtime. If you use Live View Display - settings effect OFF, the DOF will not be in realtime and it will focus at the widest aperture.

Looks like sony addressed this problem with latest firmware
http://www.sony.jp/ichigan/update/ILCE-7_7R_7S_7M2_6000_win.html
Some early adapters said low light AF speed is much better, esp. for large aperture lenses

Direct link | Posted on Apr 9, 2015 at 16:51 UTC
Total: 180, showing: 1 – 20
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