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12-12-2010, 11:22 AM   #1
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Can K-5 AF a black cat in a dark room?

Not a silly request, one of the reasons I may upgrade my K100D is to get more AF speed and low light AF abilities as the K100D & Sigma 17-70 can't AF on a black cat (no white patches allowed) in a fairly dark room even with my Sigma flash assist light working. With the K-5 AF assist light and much better AF it ought to be possible, but has anyone actually tried it?

By dark I mean you can just about see where you're walking but wouldn't think of reading a newspaper i.e. definitely flash territory.

12-12-2010, 11:30 AM   #2
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Yes, with the AF-assist light, the K-5 can focus on a black cat (or in my case a black dog) in complete darkness. Your success will, in part, depend on how close you are to the subject.
12-12-2010, 11:56 AM   #3
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don't know about a cat in a dark room

Never mind, I misread the example I gave.

NaCl( sometimes I don't pay attention as well as I should)H2O

Last edited by NaClH2O; 12-12-2010 at 12:12 PM. Reason: mis read :(
12-12-2010, 01:10 PM   #4
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I'll try it out tonight with Sammy!

12-12-2010, 05:26 PM   #5
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I can confirm that a K-r will focus on a black dog in dark room, it could possibly be a different story with a K-5 and a black cat, lol.
12-12-2010, 05:33 PM   #6
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The cat passed away before I could try it with the K5 but if the K7 could do it, the K5 certainly can.

12-12-2010, 06:16 PM   #7
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QuoteOriginally posted by dgaies Quote
Yes, with the AF-assist light, the K-5 can focus on a black cat (or in my case a black dog) in complete darkness. Your success will, in part, depend on how close you are to the subject.
One thing to think about is, the AF assist light doesn't work in AFC mode. It didn't on my K7 anyway.
12-12-2010, 08:00 PM   #8
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QuoteOriginally posted by HeavyD Quote
One thing to think about is, the AF assist light doesn't work in AFC mode. It didn't on my K7 anyway.
The AF-assist light doesn't function in AF-C mode on any of the Pentax bodies. I never used AF-C on the K-7 and other than trying it out when I first got the K-5, I haven't used it with the K-5 either. I'm more of an AF-S kind of guy

12-12-2010, 10:47 PM   #9
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In a 'dark room' is not the test, it is in a 'coal cellar'.

So you probably need to be in a very cold climate in an old house that actually has a coal cellar.
12-12-2010, 10:55 PM   #10
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My K10D isn't the worst in the world, but on the subject of cats it simply CANNOT focus on a grey cat in a dimly lit room at all. I either have to get a K5 or another cat.
12-12-2010, 11:03 PM   #11
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QuoteOriginally posted by HeavyD Quote
One thing to think about is, the AF assist light doesn't work in AFC mode. It didn't on my K7 anyway.
I don't think it works on any cameras. My D700 wont do it, the K-7 doesn't do it. My Dad's D90 wont either. My Canon's didn't either... but they use that ultra annoying built-in flash burst... so I guess that makes sense.

When you think about it though... it wouldn't make much sense to have an AF assist light with AF-C since... well it would just be on all the time to continually focus. You might as well just attach a tactical light to it
12-13-2010, 12:02 AM   #12
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It highly depends on the distance. I tried 10 meters (bush outside, dimly lit by a sodium (Na) streetlight) and the internal AF assist is not strong enough; needed to resort to the AF540 AF assist.
12-13-2010, 02:07 AM   #13
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The built in AF-light is very powerful, last night I tried to focus on the moon and the light went on and I got focus. That's how strong it is.
12-13-2010, 03:48 AM   #14
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QuoteOriginally posted by Gimbal Quote
The built in AF-light is very powerful, last night I tried to focus on the moon and the light went on and I got focus. That's how strong it is.
So that's why the moon was so green...
12-13-2010, 11:56 AM   #15
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Thanks everyone.
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