On Jul 19, 2011, at 5:14 PM, Miserere wrote: > On 18 July 2011 16:44, Larry Colen <[email protected]> wrote: >> >> >> The lighting was very uneven so rather than manual, I was shooting in TAv >> mode, in order to get the best ISO I could. The D7000 doesn't have TAv mode. >> >> >> >> -- >> Larry Colen [email protected] sent from i4est > > Nikons don't have a TAv *mode*, but they do have the capability (at > least the higher end models do) to replicate it. I believe that while > in M mode you can activate Auto ISO, which is pretty much TAv. But > Nikon go one step further and provide an unbroken usage (TAv in its > current implementation is broken) in that you can set a minimum > shutter speed, and when light levels fall such that you'd need shutter > speeds slower than this minimum, the camera keeps it at that speed an > instead achieves proper exposure by increasing ISO. This may be in Av > mode and separate from M mode + Auto ISO. Maybe someone with a high > end Nikon can properly explain this. > > As far as TAv goes, it's broken because if I set f/4 and 1/200s and > step out from inside a building to a sunny street, the ISO value will > start blinking *100* like mad telling me it can't cope. If I take a > photo it will be overexposed. This is broken. Has been since the K10D > was released in 2006. I've been complaining about it since 2007 (yes, > I even told Ned). > > The fix is extremely simple: Add an option in the Custom Menu where > you can choose Off, Aperture, or Shutter Priority for TAv. If you > choose Aperture Priority then the camera will increase its shutter > speed once it reaches ISO 100 so as not to overexpose. In Shutter > Priority it will close the aperture, and if it's Off, then it will > continue to act as it does now, because I'm sure somewhere there is > someone who wants to have overexposed photos when shooting TAv.
Actually the fix would be "extended auto" where for every auto exposure mode, when you reach the end of adjustability you get to choose which value the camera fixes next. In the same vein, I wish there was a TAv analog for the green button. I'd like to be able to set my aperture & shutter speed, use the green button to set the ISO, take a picture to chimp the histogram, and then choose which value I tweak to get the desired exposure. While I'm at it, I want an equivalent to setting the exposure with the green button that rather than using a few exposure points, takes a photo, reads every point and then does an expose to the right setting based on the raw values, or it may take two or three tries. Ideally, it would also give me the option for allowing certain areas to blow out (such as lights in the background), as well as suggesting the ideal bracketing for HDR exposure. This isn't something that a sports photographer would use, but it's the process I go through doing landscape or studio work all the time, and there's no reason it can't be automated, and do a better job than I can. > -- Larry Colen [email protected] sent from i4est -- PDML Pentax-Discuss Mail List [email protected] http://pdml.net/mailman/listinfo/pdml_pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions.
