K01 Auto Iso - Minimum Iso

TheVicar
Posted 15/12/2012 - 17:49 Link
Sorry if this has been asked before.
My K-01 has an auto ISO range currently set at 100-3200, and the wheel lets you adjust the max up or down (e.g. 1600 or 6400). How do I adjust the min? I want to take it up from 100 to 400.
On the K-30 with its two wheels, one does max and one does min.
Can the min be adjusted on the K-01

Thanks
Peter
ist*DL2, 18-55Mk1, DFA 100 f2.8 Macro, Samsung GX-10, 10-17,18-55,50-200, Sigma 10-20,100-300, 150-500 Tamron 18-200, Jessops 360AFDP
ME Super, MX, 2No. 50mm f1.7, MZ-10, 28-70 f4, 28mm f2.8, Samyang 500 & 800 f8 mirrors, Vivitar 2x TC, K-01, K-30
johnriley
Posted 15/12/2012 - 18:13 - Helpful Comment Link
You probably have to set the extended ISO range in the menus.
Best regards, John
TheVicar
Posted 15/12/2012 - 18:46 Link
Thanks for the suggestion John.
Tried this and it just extends the top range to ISO 25600
I have spotted that on the K-01 the auto ISO range shows a small min 100 and a larger max. On the K-30 they are equal size, with an arc underneath each indicating which thumbwheel to turn to change it.
I suspect the current firmware does not allow changing min auto ISO, which is a shame for a sensor with such fantastic high ISO performance.
I imagine it would be an easy thing to provide in a firmware update.
ist*DL2, 18-55Mk1, DFA 100 f2.8 Macro, Samsung GX-10, 10-17,18-55,50-200, Sigma 10-20,100-300, 150-500 Tamron 18-200, Jessops 360AFDP
ME Super, MX, 2No. 50mm f1.7, MZ-10, 28-70 f4, 28mm f2.8, Samyang 500 & 800 f8 mirrors, Vivitar 2x TC, K-01, K-30
McGregNi
Posted 15/12/2012 - 18:51 Link
I think we're talking about the 'auto-iso' range range - that is , the lower and upper limits the camera can automatically set when shooting in Green mode.

Indeed, on my K7, this is accessed from the Control Panel (press Info button - the panel appears on the rear LCD). You scroll to the auto iso item, press Ok to select it, then rotate the front e-dial to set the lower limit and the rear dial for the upper limit.

Once you have defined these limits,then you choose the shooting algorithm bias to be used - slow, standard and fast. Honestly, this is not relevant unless you use green mode. I imagine most of us use P or Av mostly, but green mode can be useful for times when there's not time to think much, or you give your camera to to a beginner.
My Guides to the Pentax Digital Camera Flash Lighting System : Download here from the PentaxForums Homepage Article .... link
Pentax K7 with BG-4 Grip / Samyang 14mm f2.8 ED AS IF UMC / DA18-55mm f3.5-5.6 AL WR / SMC A28mm f2.8 / D FA 28-105mm / SMC F35-70 f3.5-4.5 / SMC A50mm f1.7 / Tamron AF70-300mm f4-5.6 Di LD macro / SMC M75-150mm f4.0 / Tamron Adaptall (CT-135) 135mm f2.8 / Asahi Takumar-A 2X tele-converter / Pentax AF-540FGZ (I & II) Flashes / Cactus RF60/X Flashes & V6/V6II Transceiver
johnriley
Posted 15/12/2012 - 18:59 Link
Also, turn off highlight and/or shadow correction as this too limits the ISO range.
Best regards, John
TheVicar
Posted 15/12/2012 - 19:06 Link
I take your point, and I think my Samsung GX-10 operated in a similar way to what you describe, but without the algorithm bias, which sounds a good idea.
However, the K-01 only has a rear wheel, and high ISO performance is so good, you would only really want to force ISO lower than 400 to get a wider aperture or slower speed. A bit like using a ND filter.
The K-01 also has to be held in front of you using the LCD screen as it has no viewfinder, making camera shake more of an issue, so higher min ISO will mean higher shutter speed for grabbed shots, and less chance of shake. Hence why I want to increase the min ISO
ist*DL2, 18-55Mk1, DFA 100 f2.8 Macro, Samsung GX-10, 10-17,18-55,50-200, Sigma 10-20,100-300, 150-500 Tamron 18-200, Jessops 360AFDP
ME Super, MX, 2No. 50mm f1.7, MZ-10, 28-70 f4, 28mm f2.8, Samyang 500 & 800 f8 mirrors, Vivitar 2x TC, K-01, K-30
McGregNi
Posted 15/12/2012 - 19:12 Link
On the K7 at least, this only concerns highlight correction, which when active will restrict the lowest iso to 200 - (guess it's to do with the total extent of visible dynamic range.) Shadow correction shouldn't matter. But, in any case, these auto iso limits only apply to green mode I think.

I know we have 'Program Line', which I think relates to the relationship between aperture and shutter speed - this can also be set in the control panel. Not sure if this will affect the iso set in P mode though?
My Guides to the Pentax Digital Camera Flash Lighting System : Download here from the PentaxForums Homepage Article .... link
Pentax K7 with BG-4 Grip / Samyang 14mm f2.8 ED AS IF UMC / DA18-55mm f3.5-5.6 AL WR / SMC A28mm f2.8 / D FA 28-105mm / SMC F35-70 f3.5-4.5 / SMC A50mm f1.7 / Tamron AF70-300mm f4-5.6 Di LD macro / SMC M75-150mm f4.0 / Tamron Adaptall (CT-135) 135mm f2.8 / Asahi Takumar-A 2X tele-converter / Pentax AF-540FGZ (I & II) Flashes / Cactus RF60/X Flashes & V6/V6II Transceiver
carmagw
Posted 15/12/2012 - 19:29 Link
This may or may not help....

An alternative would be to set the mode dial to manual and use auto ISO, this is then the equivalent of TAV mode and actully shows this as the mode on the back of the LCD screen (It is not an option on the mode dial on the K01). You select what shutter speed and F stop and the camera picks the appropriate ISO.

I use TAV a lot with the K5 and would have no hesitation in using it on my K01

Regards

George
Pheo
Posted 02/01/2013 - 13:21 Link
I have run into this problem also, and at the moment can find no way to force the iso up in TAV mode, other than the aforementioned manual effort. Seems a little odd that they couldn't allow you to use the EV button to change item,or pressing the ISO button again, or similar,.
bforbes
Posted 02/01/2013 - 13:56 Link
On the K5 I can go to ISO AUTO Setting in the menus. select the lower ISO then use the navigation buttons on the back to raise the lower setting.

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