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<blockquote data-quote="aroy" data-source="post: 357638" data-attributes="member: 16090">Is auto ISO also on. If so then the camera may not be changing the ISO as much as the aperture. When I keep ISO constant - auto off, then in shutter priority only the aperture changes. At the max aperture the view finder starts blinking denoting that the aperture should be even wider. If I recollect correctly, this problem has been discussed previously (do not remember where and when). The reason is usually third party lenses not communicating properly with the body.To check, why not. Set ISO to 400, auto ISO off. Set mode to &quot;S&quot;. Now track the objects in bright sunlight, and note the aperture reported.If the aperture is still very narrow, then it is a communication problem. Try again with &quot;A&quot;, and check the speeds reported.Lastly, if nothing works, use the Sunny 16 rule - ISO100, F/16, 1/100, which givesISO 100, F16, 1/100ISO 100, F4, 1/400ISO 400, F4, 1/1600So set the camera on ISO400, F4, 1/1000 and see if your exposure is correct, then adjust the speed/aperture accordingly. Remember even D50 has a DR of 10EV, so underexposure by 2 stops can be easily recovered in post.</blockquote>

[QUOTE="aroy, post: 357638, member: 16090"] Is auto ISO also on. If so then the camera may not be changing the ISO as much as the aperture. When I keep ISO constant - auto off, then in shutter priority only the aperture changes. At the max aperture the view finder starts blinking denoting that the aperture should be even wider. If I recollect correctly, this problem has been discussed previously (do not remember where and when). The reason is usually third party lenses not communicating properly with the body. To check, why not . Set ISO to 400, auto ISO off . Set mode to "S" . Now track the objects in bright sunlight, and note the aperture reported. If the aperture is still very narrow, then it is a communication problem. Try again with "A", and check the speeds reported. Lastly, if nothing works, use the Sunny 16 rule - ISO100, F/16, 1/100, which gives ISO 100, F16, 1/100 ISO 100, F4, 1/400 ISO 400, F4, 1/1600 So set the camera on ISO400, F4, 1/1000 and see if your exposure is correct, then adjust the speed/aperture accordingly. Remember even D50 has a DR of 10EV, so underexposure by 2 stops can be easily recovered in post. [/QUOTE]

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