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Photo Forum / Digital Photography / DSLR Cameras / February 2007D70 ISO Auto
I have being photographing birds & thought I'd try setting the D70 to ISO Auto. The nominal setting was ISO 400 & on Shutter Priority, but the ISO didn't seem to alter & it was a very overcast day. Will ISO Auto only work in certain settings. Bruce >I have being photographing birds & thought I'd try setting the D70 to ISO >Auto. The nominal setting was ISO 400 & on Shutter Priority, but the ISO >didn't seem to alter & it was a very overcast day. Will ISO Auto only work >in certain settings. > > Bruce You don't say much about what the camera meter was saying. If there is enough light, or should I say enough aperture to get a photo where the ISO is set, it won't budge. If the camera says that your photos are underexposing, and the ISO is not changing then you may have a problem. >>I have being photographing birds & thought I'd try setting the D70 to ISO >>Auto. The nominal setting was ISO 400 & on Shutter Priority, but the ISO [quoted text clipped - 9 lines] >I had it on shutter Priority 1/250 & the lens zoom was at 210mm showing >f5.6 which is the max aperture. Bruce >>I had it on shutter Priority 1/250 & the lens zoom was at 210mm showing >>f5.6 which is the max aperture. You can ajust the minimum ISO and the minimum speed, under that the ISO will increase automaticaly. Read the manual in p.142-143. It is clearly described how the auto ISO works.  SignatureDimitris M >I have being photographing birds & thought I'd try setting the D70 to ISO >Auto. The nominal setting was ISO 400 & on Shutter Priority, but the ISO >didn't seem to alter & it was a very overcast day. Will ISO Auto only work >in certain settings. What was the resulting aperture setting? My guess is unless it was wide open iso is not going to be adjusted. SignatureEd Ruf (Usenet2@EdwardGRuf.com) http://edwardgruf.com/Digital_Photography/General/index.html >I have being photographing birds & thought I'd try setting the D70 to ISO >Auto. The nominal setting was ISO 400 & on Shutter Priority, but the ISO >didn't seem to alter & it was a very overcast day. Will ISO Auto only work >in certain settings. How are you determining the iso isn't alter. Be aware that IIRC when using auto iso the resulting iso value is NOT stored in the exif info. SignatureEd Ruf (Usenet2@EdwardGRuf.com) http://edwardgruf.com/Digital_Photography/General/index.html I have to wonder why it isn't stored, seems rather silly. SignatureJoan http://www.flickr.com/photos/joan-in-manly "Ed Ruf (REPLY to E-MAIL IN SIG!)" <egruf_usenet2@cox.net> wrote in message news:83bur2p6r66vvnksddnjso7tq97bi6mtrs@4ax.com... : : How are you determining the iso isn't alter. Be aware that IIRC when using : auto iso the resulting iso value is NOT stored in the exif info. >I have to wonder why it isn't stored, seems rather silly. The ISO value actually selected by the Auto ISO feature is stored in the MakerNote section of the EXIF data under the field name of "ISO Speed Used". At least that's the field name Opanda IEXIF gives it. IrfanView calls it "ISO Setting". This can be verified by seeing ISO values in this field of the EXIF data that are not manually selectable with the camera control, such as 220 or 430, and they will always be equal to or greater than the baseline ISO value set manually with the camera control.. The baseline ISO setting on the camera is also stored in the MakerNote section under the field name "ISO Speed Requested" (Opanda) or "ISO 2" (IrfanView). Unfortunately, many applications cannot access the MakerNote section of the EXIF data, and in my case, the MakerNote section seems to be stripped away from the EXIF data after editing the original jpegs in PhotoShop Elements. So, the auto ISO value used at the time of exposure is indeed originally stored in the EXIF data by the camera, but you may or may not be able to view it depending on various circumstances. Thanks for the explanation. I don't use ISO Auto, but I do shoot RAW, so it would always be available if I did. SignatureJoan http://www.flickr.com/photos/joan-in-manly : The ISO value actually selected by the Auto ISO feature is stored in the : MakerNote section of the EXIF data under the field name of "ISO Speed Used". [quoted text clipped - 12 lines] : stored in the EXIF data by the camera, but you may or may not be able to : view it depending on various circumstances. >>I have to wonder why it isn't stored, seems rather silly. > [quoted text clipped - 14 lines] >stored in the EXIF data by the camera, but you may or may not be able to >view it depending on various circumstances. I'll have to look again, but back when I initially got my D70 years ago, I remember trying autoiso and found Capture could not tell you what the iso used was. In fact I want to say capture would not even properly fill in the field for fixed iso when saving to jpeg, IIRC. SignatureEd Ruf (Usenet2@EdwardGRuf.com) http://edwardgruf.com/Digital_Photography/General/index.html According to RG <rg@nospam.com>: > >I have to wonder why it isn't stored, seems rather silly. > [quoted text clipped - 14 lines] > stored in the EXIF data by the camera, but you may or may not be able to > view it depending on various circumstances. But -- if you step through the information displayed in the *camera*, you will find the ISO used information -- in the first screen of EXIF data. Enjoy, DoN. SignatureEmail: <dnichols@d-and-d.com> | Voice (all times): (703) 938-4564 (too) near Washington D.C. | http://www.d-and-d.com/dnichols/DoN.html --- Black Holes are where God is dividing by zero --- According to Ed Ruf (REPLY to E-MAIL IN SIG!) <egruf_usenet2@cox.net>: > >I have being photographing birds & thought I'd try setting the D70 to ISO > >Auto. The nominal setting was ISO 400 & on Shutter Priority, but the ISO [quoted text clipped - 3 lines] > How are you determining the iso isn't alter. Be aware that IIRC when using > auto iso the resulting iso value is NOT stored in the exif info. Yes it is -- on the D70 at least. I keep mine set to 200 ISO floor and auto ISO for most purposes, and here is one of the recent shots' exif data (with a lot trimmed out): ====================================================================== ExifTool Version Number : 5.05 File Name : dsc_0137.jpg File Size : 3270KB File Type : JPEG Make : NIKON CORPORATION Camera Model Name : NIKON D70 Orientation : Horizontal (normal) Software : Ver.2.00 Date/Time Of Last Modification : 2007:01:31 17:34:28 Shutter Speed : 1/40 Aperture : 3.5 Exposure Program : Program AE [ ... ] ISO Setting : 200 [ ... ] Focal Length : 35.0mm File System Version : 2.10 ISO Speed : 1600 Quality : Fine [ ... ] ====================================================================== Enjoy, DoN. SignatureEmail: <dnichols@d-and-d.com> | Voice (all times): (703) 938-4564 (too) near Washington D.C. | http://www.d-and-d.com/dnichols/DoN.html --- Black Holes are where God is dividing by zero --- |
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