I have posted this to warn others. It worries me when you are out shooting and a seemingly unsolvable event occurs - either you get a setting configuration you accidentally set or in my case a dust spot on the sensor.
Whilst on holiday with my D750 and 24-85mm lens combo, I got back to our hotel and saw a dust spot on 50 shots. When outside it is virtually impossible to spot this on the preview screen in daylight. After working out my own tests and an algorithm to confirm a sensor dust spot whilst eliminating the lens and mirror I then went to the D750 menu to raise the mirror and remove the dust from the sensor. As part of my 'algorithm' I need to understand from the preview image where to look on the sensor but I'm sure I'll work that out if the sensor image is inverted and what focus setting best shows up sensor surface dust. I can fix my shots in Photoshop. But from now on I will open the lens and shoot a test shot to check for dust or lens blemish before taking a bunch of shots.
Then I find the mirror up option is grayed out! Fortunately I was able to search the internet to discover this option is only available with a freshly charged battery as in very charged! My battery had done 50 shots and was showing 3 bars with plenty of capacity left. For holiday shots I normally fit a fully charged battery which will last a day. Be warned! If you are out without a spare fully charged battery you will not be able to raise the mirror to clean the sensor using the menu options!
I think I found an emergency work around if you are very careful: Put the D750 into Manual shooting mode and turn the shutter speed dial to find the 'bulb' setting. Press and hold the shutter release to lift the mirror and expose the sensor. But note you must not release the shutter button whilst attempting to clean any dust from the sensor! Once you have identified where a dust spec is likely to be, it should be a fairly quick procedure to remove it.
Therein is a question for the DSLR pros. If there is a dust particle, blowing it off with a brush would seem to move it away where it could come back, vacuum suction seems a good idea, but is there a cleaning tool or product that causes a dust particle to stick to it without leaving contamination behind on the sensor surface?
Thanks - Vox
Whilst on holiday with my D750 and 24-85mm lens combo, I got back to our hotel and saw a dust spot on 50 shots. When outside it is virtually impossible to spot this on the preview screen in daylight. After working out my own tests and an algorithm to confirm a sensor dust spot whilst eliminating the lens and mirror I then went to the D750 menu to raise the mirror and remove the dust from the sensor. As part of my 'algorithm' I need to understand from the preview image where to look on the sensor but I'm sure I'll work that out if the sensor image is inverted and what focus setting best shows up sensor surface dust. I can fix my shots in Photoshop. But from now on I will open the lens and shoot a test shot to check for dust or lens blemish before taking a bunch of shots.
Then I find the mirror up option is grayed out! Fortunately I was able to search the internet to discover this option is only available with a freshly charged battery as in very charged! My battery had done 50 shots and was showing 3 bars with plenty of capacity left. For holiday shots I normally fit a fully charged battery which will last a day. Be warned! If you are out without a spare fully charged battery you will not be able to raise the mirror to clean the sensor using the menu options!
I think I found an emergency work around if you are very careful: Put the D750 into Manual shooting mode and turn the shutter speed dial to find the 'bulb' setting. Press and hold the shutter release to lift the mirror and expose the sensor. But note you must not release the shutter button whilst attempting to clean any dust from the sensor! Once you have identified where a dust spec is likely to be, it should be a fairly quick procedure to remove it.
Therein is a question for the DSLR pros. If there is a dust particle, blowing it off with a brush would seem to move it away where it could come back, vacuum suction seems a good idea, but is there a cleaning tool or product that causes a dust particle to stick to it without leaving contamination behind on the sensor surface?
Thanks - Vox