Originally posted by BigMackCam Are you using the same metering mode on both cameras? Lenses with the same field of view (so that the areas being metered for are consistent)? Standing in the same place and pointing at exactly the same point in the scene?
Nop, I can try that tho. All I could do was take the same lenses and pop them on different bodies and pan around the room to see, settling on a dark spot with the K-1 for example (with the same lens and same mode) wouldn't result in red blinking text. I could try to get the same FoV with the HD DA20-40, set to 20mm on the KP and 30mm on the K-1, that should give them similar FoV, all my other lenses are primes so can't really replicate what you need perfectly.
Point is, I usually use my K-1 in Av mode and LV a lot, I don't think I have ever seen it's text start to blink red, and in this darkened room scenario it wouldn't trigger it to doing so either (however it would trigger it for the KP).
Av mode isn't really ever supposed to blink red, it's supposed to work within it's boundaries and stay white, it would go in the red with still a lot of 'play'. For example last night I noted it go red at 1/8th of a second, not that low...
Originally posted by stevebrot The blinky indicates that the light to the meter is either out of linear range or that the metered EV is outside the available settings for auto-exposure. As noted above, live view is different than the optical viewfinder meter and apparently the image sensor used as meter has a more limited linear range.
No bug...no broken...simply how it works.
Steve
P.S. The lower sensitivity limit in live view on my K-3 is EV100 1.
Have you any source to back this up? Not that I'm doubting you, but the K-1 has never ever went red blinky text. Same room dynamics and it wouldn't change from white text info, it simply worked within my ISO Parameters, when it hit 3200 ISO it stayed there and then when I made it worse it just dropped the shutter speed more and more but still never blinked red.
KP on the other hand would go red fairly easily, 1/8th of a second and that was it's threshold and would start blinking. If I raised ISO to 6400, then 1/15th was the trigger etc, so it definitely feels like a certain level of dim light would trigger red blinky text.
We have three cameras here to 'test' with. A K3 user reports the same findings as my KP (earlier model than K-1), and me with a K-1 which is not exhibiting this behaviour at all and a KP which is a later model doing the same as the K3. So it feels sensor related (crop vs ff).
I always took red blinkies to meaning 'bad exposure' and you have to fix it via turning knobs etc, however in this case twiddling any know will NEVER fix the red blinky, it's almost like its blinking red for a different reason (like you suggest, metering out of range, untrustworthy recommended settings, user beware etc). Just wondered if there was an official passage in print from Pentax to back this up?
Originally posted by reh321 Two comments to start with
1. you need to read the text - not just notice the
color - it might contain valuable information.
2. you are being very very conservative with your KP; I limit my K-30 to ISO 800, but after some testing when I first got it, I usually limit my KP to 12800. Iso 25600! - PentaxForums.com
Now for your questions ..... I lowered my ISO limit to 3200 and tried your experiment using my 18-135 {I don't have 20-40}. When I set my KP to Av mode, it keeps ISO at 100 and continually lowers shutter speed; when using LV and shutter speed gets down to 8" the three exposure parameters start flashing red, their way of warning you that you are way past reasonable hand-held values. When I set me KP to TAv mode, it raises ISO until it reaches the limit and then starts flashing that ISO value in red ..... it acts like Av mode when you get to even more ridiculous light levels. Not sure what you mean by point 1)
My ISO limit is just an example, I vary it from job to job. Typically I am happier to handle a shutter speed drop and keep ISO under control than have unnecessarily high shutter speeds and additional grain/noise above what I needed.
If you have your KP set to ISO 100 you're not in Auto ISO but fixed for this test? I think you'll find its blinking red not because it got to 8 secs, but because it also is struggling with the meter system. Try raising your ISO to 6400, you'll get the red blinking again this time with higher shutter speeds.
I'll repeat my point before,
when I pan slowly from having 'healthy' white exposure parameters (good lighting) and gently enter worse dim lighting, as soon as it turns red and starts blinking there is no adjustment that can be made to fix it and bring it back to being healthy white. No lowering of shutter speed, no widening of aperture, no bump in ISO. The only thing that will make the red blinky text go back to being white and healthy again is to pan away from that dim lit area back towards some brighter.
The K-1 however under the same scenario never goes red blinky ever.
I further tested this in Manual Mode, and typically when red blinking exposure parameters starts happening it means it wants you to change some parameters to get better exposure (the red blinking is either very badly exposed either above or below). Using the Green button (set to Tv Shift so that it adjusts shutter speed immediately to bring about proper exposure) does work, however once again the exposure parameters stay red and blinking despite being given a new safe shutter speed.
Like Steve & photoptimist says, I think this is to do with LV metering and it suggesting to the user that it's heading outside it's comfort zones so is perhaps less accurate and 'guessing' etc.