20

There's one most likely choice for the origin and application of this transparency, and a second somewhat less likely one. The likeliest (because of the tape on the edges) is that this was a transparency intended for use on an overhead projector (these were the commonest way to do presentations that involved writing or drawing, live for a large group), and ...


18

[SAFETY WARNING: You should never image the sun with anything approaching a telephoto lens when it is more than about 10° above the horizon without a solar filter that not only protects against visible light, but also against UV and infrared!! Failure to heed this warning could result in permanent damage to your lens, camera, or eyes!] You don't need an ND ...


4

Submissions for these types of contests, and even some news agencies, require photos to be submitted as straight-from-camera JPEG files, not as exports of RAW images. This is usually enough to satisfy the submission requirements. Most of the time, people trying to skirt such rules by faking EXIF data, tend to make a mistake somewhere, that is a tell-tale ...


4

Being slightly harsh, competition rules like that show that the organisers don't really understand how modern cameras work. A very high level and simplified view of how a camera makes a image (JPEG): Light hits the sensor. Every pixel on the sensor produces an electrical reading which corresponds to the amount of light hitting it. The camera converts those ...


4

Note that positive transparent images ("slides") were the standard for stock images in publishing, before the industry went digital. I recall a book (concerning how to sell photos for stock images) describing making a 4×5 transparent positive from an original negative as a high-quality way to give them what they wanted, since a slide made from a ...


3

Usually re-touching is an add-on. Say something like this: basic retouching, included in a standard shoot, includes face retouching and global corrections, such as skin-tone or overall smoothing (or whatever you are fine with including). Additional retouching is $100/hr, rounded up to nearest half hour. Ask for an estimate. The first question for yourself is ...


2

Photographers are very concerned with accurate capture, and the art of photography deals with inherent limitations in 1) the difference of light perception between eye vs. camera, and 2) the nature of light in subject vs digital screen vs print. Strictly speaking, Polaroid-like photography is probably the only way that you can do live calibration, comparing ...


2

A well defined disc is easier to achieve when the sun is behind clouds on the horizon. And of course clouds are what catches the color as the sun rises above or sinks over the edge of the earth. Ideally there’s just the right amount of clouds to give whatever effect you are seeking. A simple graduated ND filter can help balance the exposure of the sky and ...


1

There's a third choice that is even more likely than the two presented in another answer: It was originally created to be part of a press kit that, for whatever reason, never made it into one. During the Apollo program NASA distributed a large number of press kits following each Moon flight that contained copies and enlargements of images from the mission in ...


1

Your 590nm filter still eliminates a lot of visible light on the blue end from reaching the camera's sensor. When you try to create a custom WB, though, you're telling the camera you want to end up with a photo that has a fairly even distribution of the entire visible spectrum, a good portion of which the filter is severely attenuating. So even though you ...


1

I'm guessing that you've removed the infrared and UV (lowpass) filters from your camera? The purpose of those filters is to limit the light hitting the sensor to be predominantly in the human visibility spectrum. Without those filters, you have light wavelengths punching through the nominal Red/Green/Blue¹ filters on the sensor elements and activating them ...


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