I've heard the guide line that to hand hold a camera, you need to have the shutter at a minimum of 1 / Focal Length, and obviously if the composition allows for a faster shutter speed, the better.
Today I was reading a product review article in the January 2012 issue of Rangefinder for the Phase One IQ180 Digital Back by Stan Sholik where Stan writes:
Stan continues:The first thing I learned was that hand holding it ( the IQ180 Digital Back ) on a Phase One camera, even with a 55mm lens ( equivalent to a ~35mm Wide Angle on an 35mm Full Frame ) and a high shutter speed, defeats the purpose of all that resolution.
HuhThe system requires a solid tripod or studio stand to deliver the sharpness of which it is capable.
First off, I wondered how much resolution was he talking about ? Granted, the Phase One IQ180 is classed as Medium Format with a 53.7 x 40.4 mm CCD with a 5.2 um photosite pitch. Well, this is not quite a medium format frame size which are typically 60 x 60 mm, 60 x 45 mm, but frame size and photosite counts don't measure resolution. As I started with and still shoot film, I always fall back to the measure of Line Pair / mm, which amounts to the number of alternating light and dark line pairs that can be resolved per millimeter. With digital technology, the limiting factor for the minimum line is the photosite pitch. Anything less will result in aliasing artifacts from sub-photosite sampling or blending a dark and bright line pair into a mid tone grey.
For the Phase One IQ180, you need 10.4 um to resolve a minimum Line Pair, or calculating 1 / 0.0104 mm for 96.15 LP / mm.
Now I'm even more confused
OK, the Phase One IQ180 at 96.15 LP / mm beats my Sigma SD14 with only 64.10 LP / mm, but you can still buy Pharmacy/Chemist cheap crappy film with a resolution of 100 LP / mm ! If you really look around, you can find professional films that boast 160 LP / mm.
My first question that I'm seeking help with, Why would a professional photographer like Stan Sholik make a claim that a high shutter speed and wide angle lens can not be hand held for a resolution of only 96.15 LP / mm ?
Now, for my photography, Focus and resolution are paramount. This is why I still shoot film. When I calculate lens Hyperfocal distances, I use a circle of confusion matching the photosite pitch or film line width derived from the LP / mm. If a tripod is mandatory for only 96.15 LP / mm, What weight rating and stability is necessary for higher, film, resolutions ?
As it is I have a low cost Velbon DF-50 rated to 5.44 kg and my peak loading only amounts to 1.6 kg, not even reaching 30% of the tripod's weight limit, but based on the above information Do I need a heavier tripod or has Stan Sholik gotten a bit off track ?