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Effective megapixel size of a Kodachrome 25ASA slide is calculated to be, depending on your method of calculation, to be between 80,000MP and 25,000MP, with a few nay-sayers saying that your old Kodachrome transparency is only around the equivalent of 8400MP...which my eyes say is hogwash.Bob Gilmore
Fuji Velvia 50 is rated to resolve 160 lines per millimeter. This is the finest level of detail it can resolve, at which point its MTF just about hits zero.Each line will require one light and one dark pixel, or two pixels. Thus it will take about 320 pixels per millimeter to represent what's on Velvia 50.320 pixels x 320 pixels is 0.1MP per square millimeter.35mm film is 24 x 36mm, or 864 square millimeters.To scan most of the detail on a 35mm photo, you'll need about 864 x 0.1, or 87 Megapixels.
The Railwire is not your personal army.
Quote from: nkalanaga David: "sorry about the poor phone pics" Are you old enough to remember the quality of the pictures in most model magazines into the 1970s? Even the cheapest phones do a better job than most modelers of the past could dream of. Yours look fine to me, in focus, colors are good, what more can one ask for?Welllll....since you asked (1) More depth of focus, (2) less contrast so the dark areas reveal their details (3) more natural white balance (4) finer resolution...In the 70's, my camera body of choice was the Nikon F2AS, two of which I picked up from a fellow sailor who needed money and had bought a full Nikon 7 lens, two-body outfit while in Hong Kong . . .<snippage of a lengthy description o Robert's wonderful photographic skills and equipment>Sooo...when I was taking photos of my model ships and military figures in the 70's, the technical quality was much better than mere cell phone photos taken today...by ANY cell phone.However, Dave doesn't need to apologize for his cell phone photos, since they serve their purpose of showing us his excellent model work!Just sayin'!! Bob Gilmore
David: "sorry about the poor phone pics" Are you old enough to remember the quality of the pictures in most model magazines into the 1970s? Even the cheapest phones do a better job than most modelers of the past could dream of. Yours look fine to me, in focus, colors are good, what more can one ask for?
ooooh more on the logging layout
The Ntrak Roadshow hosted the M3T this weekend at the Doubleheaders Layout Tour, in the Kitchener-Cambridge-Waterloo-Guelph area.
time. This is looking great. I love little PRR steam. But, I'm not in love the with the air tanks under the cab. They don't quite look fat enough like the prototypes.
Jim, looks great. Were you able to wire an LED in the headlight through the headlight and bracket passages?
Interesting. Maybe everyone else know the background to all this, but I do not and would like to know more if you do not mind. What is Copenhagen Fields and how come you got involved etc?
Dang, wish I had known about this I was actually in the area.
I would be interested to see where your figure of 25,000 to 80,000 came from. Not sure I agree with that extraordinary claim and I have Grumpy's extensive research on slide film and duplication to back me up http://blog.grumpysworld.com/ (search his archives for slide digitization, or duplication or film quality for some interesting reading)It seems like grain becomes a huge issue with any 35mm slide film before you get anywhere near those resolution figures. In fact this source claims you're smallest number is out by a couple orders of magnitudehttp://www.kenrockwell.com/tech/film-resolution.htmBest reference I can find is that Kodachrome 25 is around the the same 87mp resolution at 150 lines per mm But in reality Grain becomes a huge issue with any 35mm transparancy before you even get close to the 87mp figure and any modern 24+ mp camera can far surpass 35mm film in Image quality. Now large format cameras are a different animal together and capable of much higher resolution then 35mm film. would be interested to see the resolution of an old glass plate negative calculated
Welllll....since you asked (1) More depth of focus, (2) less contrast so the dark areas reveal their details (3) more natural white balance (4) finer resolution...In the 70's, my camera body of choice was the Nikon F2AS, two of which I picked up from a fellow sailor who needed money and had bought a full Nikon 7 lens, two-body outfit while in Hong Kong . . .<snippage of a lengthy description o Robert's wonderful photographic skills and equipment>Sooo...when I was taking photos of my model ships and military figures in the 70's, the technical quality was much better than mere cell phone photos taken today...by ANY cell phone.However, Dave doesn't need to apologize for his cell phone photos, since they serve their purpose of showing us his excellent model work!Just sayin'!! Bob GilmoreNot every model railroader back in those days had access to decent photo equipment, and most were not professional photographers (like you). To me Nick's "what more would you need" statement simply stated that today's smart phone shots produce images of more than sufficient quality to be used in online forums to show someones modeling project.Think about it: a smart phone camera with its small sensor and small focal length lens has a greater DoF than many simple film cameras of the years past. Plus they have enough light sensitivity that no tripod is needed for those quick in-progress shots of the modeling project. Even your closing statement (after a lenghty paragraph about great vintage photo equipment) seems to affirm that this is the case.I'm also questioning the equivalent megapixel ratings of the color films (positive or negative). They seem to be a bit overoptimistic.
The layout has been built by members of the Model Railway Club, London starting in 1983. It is a model of the lines out of Kings Cross station. The station itself is just off scene to the left. It is built to 2mm Finescale standards in 1:152. Most of the locomotives are scratch built, with the coaches and wagons being built from kits. I moved to London in 2011 to study and promptly joined the MRC. Over time I got to know the members of the layout group and started helping out. I moved back to the USA 18 months ago but stayed in touch. This weekend was the club's show and CF was going to be there, so I took a trip over to help out.Here are a few pictures I took while setting up. The whole thing is a giant 3D jigsaw puzzle. It usually takes 5 to 8 people 5 hours to get it up.Sections in a storage box:Installing the sky:In-process building:Tah-Dah!There's a bit more on the club's website: http://themodelrailwayclub.org/layouts/copenhagen-fields
Feel free to get in contact next time you are up this way, there are shows quite regularly around here.
The layout has been built by members of the Model Railway Club, London starting in 1983. It is a model of the lines out of Kings Cross station. The station itself is just off scene to the left. It is built to 2mm Finescale standards in 1:152. Most of the locomotives are scratch built, with the coaches and wagons being built from kits. I moved to London in 2011 to study and promptly joined the MRC. Over time I got to know the members of the layout group and started helping out. I moved back to the USA 18 months ago but stayed in touch. This weekend was the club's show and CF was going to be there, so I took a trip over to help out.Here are a few pictures I took while setting up. The whole thing is a giant 3D jigsaw puzzle. It usually takes 5 to 8 people 5 hours to get it up.