olgierdc

I see double, thicker lines in the letters (stickers). E.g. ZM 21 3.4 Best or SEM 3.4 Worst.

In my opinion, three photos are blurry. I looked at the DNG images. You wrote that the photos were taken on a tripod, but the yellow cards with inscriptions have blurred inscriptions. Maybe the shutter or the tripod with the shutter is causing the vibration. Place a glass of water on the camera and see if the water vibrates during the trigger. If you have a flash, try a shorter time. ISO 200 or 400 will be sufficient.

https://www.aaronlinsdau.com/dslr-flash-voltage-safety/ SB800 has low voltage hot shoe, so I think it will work (3,6V). I used Leica SF-24D with c.a. 20V hot shoe with Leica M10. It will work only in manual mode.

The value of the measured voltage is partly due to the duration of the flash and the duration of the electrical pulse. When measuring the peak voltage with a Fluke 87 multimeter, the voltage pulse time must be greater than 1/4000s because the multimeter needs 250us to measure. The lamp itself has a flash time between 1/250s and 1/30000s. Longer flashes are obtained by using more flash power. So if anyone measures the voltage with a flash shorter than the time in which the voltage measurement is made, they will receive undervalued values. Therefore, I obtained voltages of several volts when measuring with low power or in the non-peak voltage measurement mode. For such measurements, it is best to use a fast oscilloscope with memory. I would consider the 20V voltage results as reference for this Flash. I am using flash SF24D with M10 and M10-R without problems.

I have two Flash SF 24D. I measured the voltage on both, which the meter usually shows 4.6V. However, if I measure the peak voltage, it is up to 20V (usually between 15-20V). Used multimeter - Fluke 87V.

Simply, Sony is another kind of animal, very strange one

Try with another alternative charger. It worked for me with M9.

You're right, but there's always a compromise. However, it is worth to consider all options.

I would consider buying a Leica M262. You will pay half of the price of M10 and you will have money to buy lenses. The difference between M262 and M10 is not significant. As you want enter to landscape, you need a wide angle lens. 21/3.4 is perfect. Unless you are only interested in a new camera.

... if the digital signals were perfectly rectangular and if the time and flash luminosity were also perfectly rectangular, there would be no problem. Synchronization could also be ideal. But, different manufacturers set different synchronization points during the flash, which has the phase of raising and falling. In addition, there are delays in radio equipment and additional delays in digital signals. At the end, the camera manufacturer has its own specific shutter, which by its nature is a mechanical device. Temperature, type of material, dirt, oil may have and have affect to release of the shutter. You must be lucky enough to make it work. But I must admit that MY Leica M9 works better in this field.

Wire trigger works at 1/180, wireless depend of the radio you are using. Pocket Wizard is slow, Elinchrom is faster.

After 5 years, the battery capacity has dropped to 75% (about 15k photos). Knowing that the minimum battery level for operation of the camera is 10%, the actual capacity is no more than 65% of the declared capacity. I have the impression that at lower temperatures the battery performance is even lower.

In my opinion, automatic white balance is the worst solution. Each subsequent photo can have different colors and it looks usually bad. Sometimes I happened to take pictures in AWB mode, and then I sat for hours at LR and tried to set the correct color, especially as the picture had no white or gray element. For example, make a golden grain field in AWB mode. Usually, the Kelvins temperature setting is not too precise, because in addition to the blue-yellow range, sometimes the magenta-green tint should be set (especially in artificial light), which Leica cameras do not have. The best solution is to use the White Balance card. Another option is to set Daylight for outdoor photos. It is not perfect but we have at least pictures that are homogeneous in color. Of course, many times later I adjust the colors in LR, but at least I have a good starting point and the way of further work is consistent. At the end I would like to point out that the Daylight setting gives different colors compared to the same Kelvins color setting, the difference lies in magenta-green tint.

On the silver one can see less dirt.

You can use Yongnuo YN560 III flash with transmitter RF-600TX for a very low price. The set works, of course, only in manual flash mode.