I´ve been using different camera-system for many years. Mainly Pentax, Nikon and Olympus as well as Leica. First analog cameras like Nikon F2, Pentax Spotmatic, Nikon F3, Pentax LX as well as the Olympus OM range from 1 to 4 and Leica both rangefinder-cameras and SLR:s.
Moving to digital, I´m still with those brands, but now it means that I have three different sensor-sizes and that means that I now have the oportunity to match the size of my equipment to my needs for different jobs. As well as matching the depth of field with my creative ideas. The smaller micro 4/3 gives more depth of field if i compare to pictures taken with the same mganification, or framing. For example a 200 mm on micro 4/3 and a 400 mm on fullframe.
When I´m travelling I normaly use the Pentaxes because they´re a good compromise between size an capability. One of my favourite lenses is the DA 60-250 mm f/4,0. In most situation like travel-photography or motoring-photography I use this lens together with a Pentax DA 16-50 mm f/2,8 and Sigma 10-20 mm f/3,5. The great advantage is that i can carry this equipment in a small backpack and even as carry-on on a plane. If i compare it with my full frame Nikon equipment the 60-250 mm in many ways is a more useful lens with the same magnification in 250 mm on a Pentax K3 as Nikons 200-400 mm f/4,0 on a Nikon D5. The same constant f/4,0 through the entire zoom-range.
If I compare the sharpness of the two I would say they´re pretty much equal, but the Nikon-combo is faster focusing and better to follow moving objects. There´s also an advantage with the Nikon imagestabilising if you are taking pictures of cars moving, like the picture of the sivercoloroured Mercedes. It´s possible to stabilise the camera in only vertical way with the Nikon, so that you can use a longer shutterspeed to create the feeliing of a car that moves very fast. On the other hand the Pentax lens covers focallengths from 60-250 mm in APS-format, which means 90-375 in fullframe.
My favourite combo for car-photography in this way is Pentax K3 II with batterygrip and the 60-250. The Nikon D5 with 200-400 is a bit to big both to travel with and to use. I rather use the 80-200 mm F/2,8 with the Nikon.
There´s two major advantages with the K3. It´s very sturdy built and in my point of view all controls are att the right place. Plus for the different user-setting so that I very fast can change from taking pictures from aside the car when its moving fast, where I use low sensitivity and long shutterspeed, like 1/60, to higher sensitivity and shorter shutterspeed when the car moves towards me.
I found out how well the K3 is built when it fell from the roof of a car with the Sigma 10-20 mm. They where both working perfectly after that. The lensbayonet is all metall including the camerabody where it´s mounted. A similar situation with the Nikon D7100 kosted me about half the price of the camerabody since the bayonetmount was dragged from the camera with the screws that where mounted in plastic to the body. The Nikon D500 is more sturdy, like the K3 but heavier and bulkier. This is an important difference between Pentax K3-7 series and Nikon D7000 series.
