Mist

by Jakub

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9,135 reputation
1130
bio website embedinc.com/olin
location Littleton, Massachusetts
age 58
visits member for 3 years, 7 months
seen 17 hours ago

Electrical engineering consultant specializing in microcontrollers and the circuitry around them. Master of engineering in EE from Rensselaer Polytechnic Institute in 1980.

We are certified Microchip design partners, and have been in the top catagory consistantly since around 2000. Various free downloads related to developing PIC firmware and other things are available at http://www.embedinc.com/pic/dload.htm.


17h
comment What is this glowing light effect called and how do I achieve it?
Off topic, not about photography.
Jul
25
comment Does anyone know what this photo is from?
Do you have a higher res version? If so, you might be able to read some of the signs, like the bilboard near the middle that seems to be advertising some sort of drink. The writing and language should help narrow down the possibilities.
Jul
25
comment Why are lenses always round in shape?
@szul: No. You seem to be assuming that light coming into a point on the front of the lens maps directly to a point on the image plane. It doesn't work that way. Light for any point on the image plane is gathered by all the front surface of the lens. Take a look at some diagrams in a high school physics text.
Jul
25
comment Why are lenses always round in shape?
@Tom: Not really. All the light hitting the lens from a point in the scene that ends up in the image is used to make the image. The is true regardless of lens shape.
Jul
18
comment How can I clean the smell of cigarette smoke from my camera body?
It is still a very poor answer. This is not how things are done here. Is this a chemical? A brand name product? A kit? If commercial, are you associated with the makers or sellers? As a casual reader that doesn't actually have the problem presented here, this kind of answer is annoying and rude, -1. And, keep in mind that most readers are going to be of the casual type, so I expect the downvotes will continue.
Jul
18
comment Where can I buy photographic film in Prague, CZ?
You have just re-discovered one of the many advantages of digital versus film. Maybe it's time to move on.
Jul
13
comment Do web-based photofinder services for stolen cameras work?
None of this answers the question, which is how well these kinds of sites work. Anecdotes are not data. Examples of real data include what fraction of paying customers ever get their cameras back.
Jul
13
comment Astrophotography, what to shoot with barndoor tracker and 200mm f2.8 lens
Extension tubes are totally useless for astrophotography. Extension tubes move the lens further from the camera body, allowing it to focus more closely than it can otherwise. In short, extension tubes are for macro photograph, near things not distant things.
Jul
11
comment Right to use a photo taken at a Russian train station
In the US I think (not a lawyer) this would be OK since it is a public place where the people in the picture do not have the expectation of privacy. How this works in Russia, I have no idea.
Jul
11
revised Got my first vintage lens (Carl Zeiss Jena Pancolar 50mm f/1.8) - what's this lever for?
added 234 characters in body
Jul
11
answered Got my first vintage lens (Carl Zeiss Jena Pancolar 50mm f/1.8) - what's this lever for?
Jul
6
comment Laws regarding photos taken from airplane?
@Russell: I temporarily put it at embedinc.com/temp/b.jpg
Jul
6
comment Laws regarding photos taken from airplane?
Just for fun, I played around with your Australia picture. Using some possibly white areas on the buildings at bottom, I found that (1, .875, .450) made a sortof plausible white ballance value. The low blue value is consistant with the obvious yellow cast. The result looks a lot better to me, although I never saw the original to be able to judge. This process would be easier on the raw full-size image.
Jun
25
comment Where can I obtain direct positive paper?
Acutally the side effect is desirable in this case, since the original will be mirrored. The contact print will un-mirror it.
Jun
25
answered What lens designs are sharper than a pinhole lens but also allow for multi-month exposures?
Jun
22
answered Can I re-rinse developed negatives?
Jun
22
comment What are these streaks in negative scans I got back from a lab?
Look at the actual film. Are these artifacts on the negatives too, or just in the scans?
Jun
21
comment How do I practice with a ND filter?
@junk: Hmm, it does look backwards. I just checked the EXIF data on the original pictures though, and that's what they say. However, I replaced the 1/2 second one with a different 1/2 second one I took in the same sequence. Both say 1/2 second in the EXIF data, but this one seems more consistant with others in terms of motion blur relative to exposure length.
Jun
21
revised How do I practice with a ND filter?
edited body
Jun
21
answered How do I practice with a ND filter?