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Forum: Pentax K-5 & K-5 II 10-16-2010, 01:12 PM  
K20D to K-5 or “I am in love all over again”
Posted By jrforman
Replies: 44
Views: 10,735
K-5


K20D


Same settings, same lens, same iso, etc.

The K20D had trouble with reds in my experience - K-5 more realistic colors IMHO.
Forum: Pentax K-5 & K-5 II 10-17-2010, 01:25 PM  
K-5 vs K-7 noise comparison
Posted By MAC
Replies: 53
Views: 42,814
I just did a quick n' dirty comparison.

With the camera in manual at ISO 100, 5 sec., f8 with all camera settings absolutely identical the k-7 image was noticeably darker, as already observed with most of the shots in this thread. The histograms back up what we're observing. I adjusted the k-7 ISO up 1/3 stop at a time until they appeared to match, and at ISO 160 the histograms are nearly identical.

I'm afraid I've run out of time to do any further testing right now.
Hopefully one of the other K-5 owners here can help answer this.
Forum: Pentax News and Rumors 10-04-2010, 07:19 AM  
Pentax K-5 Officially Announced
Posted By youky63
Replies: 533
Views: 181,842
Here are the official prices in Japan for the different kits (10% can be removed of all prices by using the Shop Points Card). Prices are given for Japan only and cannot be extrapolated to any other country.

K5:

-K5 body only: 139.800 yens (= 1.679 USD = 1.225 euros)
????.com- ?????? K-5 [???]

-K5 + 18-55mm WR: 154.800 yens (= 1.859 USD = 1.357 euros)
????.com- ?????? K-5 [18-55WR??????]

-K5 + 18-135mm WR: 189.800 yens (= 2.280 USD = 1.664 euros)
????.com- ?????? K-5 [18-135??????]

K5 is expected to be released end of october.

Kr:

-Kr body only, any of the 120 colors: 74.800 yens (= 898 USD = 656 euros)
????.com- ?????? K-r [??? ????]

-Kr + 18-55mm (any body color): 79.800 yens (= 958 USD = 699 euros)
????.com- ?????? K-r [030 ?????? ????/???]

-Kr + 18-55mm + 55-300mm (any body color): 99.800 yens (= 1.199 USD = 875 euros)
????.com- ?????? K-r [055 ????????? ????/???]

Kr and the different kits will be available between October 7 and October 10.


DA18-135mm WR:

Available middle of November for 59.800 yens (= 718 USD = 524 euros)
????.com- ?????? DA18-135/3.5-5.6ED AL[IF]DC WR


DA35mm f/2.4:

Available middle of November in any color (Japan only) for 24.800 yens (= 298 USD = 217 euros)
????.com-pentax 35mm-????


Just for information, the K7 (body only) is actually sold at 88.800 yens (= 1.067 USD = 778 euros)
????.com- ?????? K-7 [???]

As you can see, prices in Japan are going to be the most expensive in the world. Thanks to the economical situation leading to weak dollars and euros.

Then a few more informations. Last weekend was held a hands on preview in Akihabara (Tokyo). People were basically able to see what was already held in Photokina.
A few others exhibitions will be held during the next weeks. The next one will be in my city (Osaka) on October 16th from 12:00 to 17:00 in the 3rd floor of Umeda Sky Building. I will try to go there. During the following day/weeks they will move to Nagoya, Sapporo and Fukuoka. Informations here.
Forum: Pentax News and Rumors 09-29-2010, 04:06 AM  
Pentax K-5 Hands-on preview
Posted By falconeye
Replies: 87
Views: 28,773
janneman,
you're right and I hope I wrote nothing else in the article.

The problem was that with e.g., a DA*16-50, the focus on both K-5 and K-7 was almost instant in the office-alike Pentax business area lighting (if the lens was only defocussed a bit). It was then impossible to say which one beeped or triggered faster.

Visually, I got the impression that the K-5 started to focus faster and also locked faster. Maybe, the difference I saw was significant actually. But we talk about ms differences jugded with the naked eye here. So, maybe I saw nothing.

So, a real benchmark where focus times can be measured with ms accuracy must be made. And another one in low light. And accuracy should be measured too as it is often ignored by magazine reports. AF.C is another topic. As is single image AF.S or AF.C accuracy for a moving subject...

For me, the real difference is the AF sensor measurement integration time. It is unknown (except I saw a few bits about it in the pre-production camera EXIF fields). If this time is small, focus on fast moving subjects is possible (even if it then moves out of focus -- at least with trigger priority and maybe prediction, the result with not too thin DoF should still be usable). If this time is large, focus can't be measured because it acts as if the subject would be blurred or noisy. Like AF becomes impossible freehand at too long focal lengths or in very low light. The AF then stalls and the camera won't trigger anymore.

So, with fixed subject contrast and illumination, there should be a limit for maximum subject speed (magnification change speed actually) at which AF stops to work. If this can be measured (together with the latency between AF measurement and photo taken), we may have a good characterization of an AF system. Much more meaningful than all the common trigger latency tests (200ms vs. 300ms etc.).
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