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Ken Rockwell is wrong....
In reply to Muizen -Belgium,
3 months ago
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Muizen -Belgium wrote:
One of the reviewers of the RX1 makes the following observation:
Shot in Professional ("P" mode) and Auto ISO, as I and my pro friends always shoot and as I think is the RX1's default, the RX1 does everything it can to shoot everything in most light at 1/80 and f/4.
The RX1 varies its Auto ISO to retain 1/80 at f/4, and if you shoot in A or S modes, also keeps varying the ISO to try to retain the other variable at f/4 or at 1/80.
In other words, instead of using the f/2 ability of this lens, the RX1 will ramp the ISO as far up as it can (like to ISO 25,600 depending on how you set the Auto ISO limit) to keep shooting at f/4 before it starts opening the lens more.
If you try to get smart and shoot in A mode and set f/2, Auto ISO again does everything it can to keep you at 1/80, and not let it go to slower speeds until you've hit the upper preset Auto ISO limit.
There is no way to vary these settings. Auto ISO always uses 1/80 as its minimum shutter speed, so it can't be set to a higher 1/125 as I prefer for family shots, and can't be set down to 1/15 or 1/8 as I'd prefer for other shots. Auto ISO queerly uses f/4 as its maximum aperture before it starts ramping-up ISO.
Is this really a problem and is there a way around this?
--
Harry
At least he's over-simplifying things. The pattern he's talking about only happens in low light, of course. In reasonable light, it will keep the ISO between 100 and 125, the aperture seems to max at f8, and the shutter speed goes from 1/80 to faster. In dim light, you get the pattern Rockwell mentions (f4 1/80) and the ISO rises. However, when you hit ISO6400 the aperture goes to F3.5 --> F2 as the light fades... the ISO tries to stay at 6400max. Rockwell says that the ISO will go up rather than the aperture opening "depending on how you set the Auto ISO limit" ... the problem is, as far as I can see, there's no way to set the auto ISO limits on this camera. If Rockwell actually used an RX1, he was smoking something funny at the time.
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