Alley in Pisa, Italy

by Lars Kotthoff

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5,567 reputation
616
bio website pfarrell.com
location outside Washington DC
age 63
visits member for 2 years, 5 months
seen Jun 30 at 2:57

Programming since punched cards


Sep
8
comment How do I convert lens focal length (mm) to x-times optical zoom?
May I ask why you want to know this? Its not a very meaningful metric.
Sep
8
comment Taking sports and action shots with regular lenses
a 50mm may be fine if all the action is right in front of you. For years I shot sports when all I owed was a 50mm, but I had to get really close. Something 200 or 300 is more realistic if you want to catch action in the mid-field or if you want to stay out of the danger. Remember, image stabilization doesn't help when the subject is moving, such as a player flying across the field. Many sports photographers trade IS for more open aperture.
Sep
7
comment Using an umbrella type softbox and light quality
Then the ribs are even less visible. And the flash inside does not leave a shaddow because the light bounces off the silver lining. The light will hit close enough to the center to resolve your worries.
Sep
6
comment Does the Nokia Lumia 920 truly present any significant advancements in cameras?
Is a cell phone camera. It may be a really great cell phone camera, but don't sell your D3 or 5D mark 3.
Sep
5
comment How to protect surface of lens or filter from condensation of moisture
@russel, its really simple. The lens and the air in it are warm and have water vapor in them. Take the lens out, say Canada or Alaska in the winter, and the lens cools down rapidly, which condenses the water vapor as it reaches the dewpoint. At first, it only condenses on the inner surfaces of the lens body. As the lens continues cooling, even the glass cools and that condenses even more water, fogging the lens.
Sep
3
comment What are factors to look at when going from a entry level DSLR to a higher level?
I used my Canon 50D for 18+ months and was not happy with it. Fixed it by first reading Strobist.com and learning how to use cheap strobes, and second, buying a EFS 17-55 F2.8. The lens was expensive, the flashes were dirt cheap. Now I'm a happy guy.
Sep
3
comment Lomography Diana for a novice photographer
+1, a 90's vintage Canon or Nikon SLR with a nice 50mm lens is a great learning tool for film and can take wonderful pictures. You can get a Nikon F4, which is a great camera for well under $500
Aug
30
comment Any good yet reasonably priced tripods
That looks awfully light for that 300mm lens, let alone your next one. Its got an old-style tilt-pan head, most folks these days prefer a ball head. When you read the reviews on B+H, even folks who like it say they legs are flimsy. I went with this one, about $160. bhphotovideo.com/bnh/controller/… but its mostly a personal choice.
Aug
29
comment Why are 50mm Lenses Cheaper?
Huh? Its all economics. The lenses you list are more modern, more specialized. Yes, things that are less expensive tend to be more popular, that is what economists call the law of supply and demand.
Aug
29
comment Why do camera manufacturers use different lens mounts?
Actually not a great analogy, lots of Ford and BMW cars use the same transmissions. Most old photographers (shooting a long time, not old in age) have more money in lenses than in bodies. The lock-in is important, and probably of equal importance to the brand.
Aug
29
comment Why do camera manufacturers use different lens mounts?
@t3, sorry, but while the Nikon F mount is the same, many pre-AI lenses will not even mount on modern consumer and enthusiast DSLR bodies. I have about ten of these lenses. If you are talking about lenses under about 20 years old, sure, the Nikon mount is consistent.
Aug
26
comment Is it important that the Canon 1DX isn't specified to autofocus with lenses slower than f/5.6?
This is an awfully subjective question. What is worth it to me is likely to be not worth it to someone else. Plus, we are talking about a $6000 camera body. That puts the whole discussion on another plane.
Aug
26
comment Why do people recommend 50mm or other prime lenses as starting lenses for learning photography?
Yes, most folks starting out have crop sensor cameras and so the normal lens is not a 50mm. Sadly, the manufacturers don't seem to think that folks with crop sensor cameras are interested in inexpensive normal lenses. Canon has no about 30mm F-faster than 2.0 lens at anything like the $110 that their 50mm F1.8 is.
Aug
24
comment How much do lens lineups vary across DSLR platforms?
I have a Nikon F and a lot of lenses for it. While the Nikon F mount is the same since the beginning (I think late 50s or early 60s) the fact are that most of my old non-AI lenses will not mount on most modern Nikon bodies. My lenses have the "prong" that was used to couple the lens to the meter on Nikon bodies of the 60s into the mid-70s. The prong will not clear the pentaprism of many modern Nikon bodies. I keep seeing folks say that Nikons use all old F-mount lenses. Its just not true. Lenses made in the past 30 years work. Not all.
Aug
19
comment What would be a good indoor setup to find a lens's sharpest aperture?
To be clear, its actually "faster" shutter speed. 1/135 means 1/200 is good, 1/500 is better. Sometimes, you gotta use a strobe to get the light you need.
Aug
19
comment Does specialty film scanner software provide any real benefits over bundled applications?
@imre, are you sure? Yes, they use infrared light. But they should be able to adjust the focus plain and be selective as to what is at the film position and what is above it.
Aug
19
comment Does specialty film scanner software provide any real benefits over bundled applications?
I have bought both VueScan and SilverFastAll. The bundled Nikon software for my slide scanner has not been upgraded in at least 5 years. I had to buy the 3rd party software to have it work at all using either Windows 7 or OS-X Lion. I love VueScan and the support is great.
Aug
15
comment What variable maximizes color in astrophotography?
Yeah, and they filter frequencies of the incoming signal, some of which are not in the visible spectrum. They essentially use layers for each set of filtered image. Very cool stuff, way over my head.
Aug
14
comment Why not separate a tilt shift lens into two separate lenses?
@stan, the good news is that with a view camera, you can adjust the bellows and correct any flange to sensor distance changes. Which means that in addition to being not cheap, they are complex.
Aug
14
comment How can I take natural looking photos of my kids, etc. with a compact camera indoors?
the white index card off a white ceiling is your easiest and cheapest solution. You may have to adjust the exposure compensation.