“how is the iso upgraded to 128.000on on a t61 canon dslr camera for the canon dslr t6i camera how is the upgrade to 128,000 iso”
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I'm assuming you meant 12,800 iso because the t6i/s can handle up to 25,600 iso with custom config options in the menu. At max iso, results vary on just how low the lighting is that you are trying to compensate for. My raw shots contained less noise than I would have expected 7 shooting situations out of 10 (jpg not so much), IF multi-shot noise reduction is possible. Its not nearly as clear as say, the 5D Mark III which can achieve a significantly higher iso, but thats a $3,500 body and detail loss and coloring is still not beautiful after 1600 iso. Canon suprisingly made this range of iso an affordable option, and of course such a high iso is never an ideal for any photographer because of how much detail you lose and how terrible the sharpness compensation can make the subjects look, but having the option and knowing I can achieve passable images with it when I need it does help me in those situations where I want to shoot fast and cannot compensate the darkness with an external flash. One time I was not super impressed with a 12,800 iso was when I was shooting in an oddly colored gym enviroment with dim yellow lighting for a sporting event. handheld and bipod, shooting at that iso I'd say maybe 10 or 15 out of the 300 shots I took were passible with some post touchup, while the rest were either too soft or had too much color noise. So its great to have the option, and its a great feature for a less than $1000 camera, but results do vary significantly based on the subject and the situation. But you can compensate for the noise with the MSNR (multi-shot noise reduction) option which takes 4 shots and merges them to achieve a less noisey result, however this is not suitable for althletics or handheld situations obviously and you will still lose quite a bit of detail. Overall, I'm very happy to have such versatility in my shooting enviroments and it helps me avoid having to use a tripod for moving subjects in some semi-low light enviroments, but to truly utilize such high iso's with decent results, higher end cameras with more sensitive chips would achieve a little closer to a professional low light shot (nice sharp lenses help too!). Unless you've shot with a $2000+ camera in the same conditions, you won't consider the results below what you should expect, unless your attempting the impossible. So I'm satisfied with the abilities the t6i has at higher iso, but will go out of my way to avoid using them if possible.
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