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Before the recent rise of the digital SLR, medium format film cameras were often the tool of choice for night photography. For many night photographers this still holds true. Due to longer focal lengths, and film reciprocity, a standard full moon exposure for medium format film can often run in the 15-20 minute range at f/8. With clear skies, a 15-20 minute exposure produces a star trail length that hits a personal sweet spot for me. I will often push the Canon 5D into the 10-12 minute range to get longer star trails. With noise reduction this ties up the camera for 20-25 minutes per shot, giving you shorter star trails than film, and less productivity.

Итак, пост будет про основы основ фотографии. Это то, на чем базируется искусство фотографии. Это законы, лежащие в основе мастерства фотографа. И, наконец, это принципы, следуя которым, любой новичок может значительно улучшить свои навыки фотографирования.

Mark Galer has delivered an eSeminar for Adobe on commercial retouching. If you would like to download the slides to this eSeminar download them at the jump.

Photographer Jon MacKinnon, like me, he’s an aficionado for the DIY stuff.

He contact me a couple of weeks ago saying the he recently started a Discussion group at Flickr concerning my Lighting Mod posts (do you still remember them?) DIY: 580EX Color Gels Printing Diagram and DIY: Black Straws Snoot Grid (Part 1) and the discussions are all about diagrams for different flash models and you can even add your own model if it isn’t already there.

The hulking Mt. Prospect 90mm lens and the Rodenstock 68mm lens (both are f/1.0) are notably sharper and less “foggy”, despite all lenses being crisp and clear through the viewfinder. A focussing rail would make critical focussing much easier, but at f/1.0 (and f/0.75), there was never a problem with getting a high enough shutter speed to hand-hold the lenses (the 90mm lens is about 2 kilograms!).

All lenses have a limit to how close they can focus. A typical lens, for example, may not be able to focus on anything closer than 30cm. This is because as objects move closer to the lens, the focal point moves further back, eventually beyond the plane of the film or sensor. An obvious way around this problem is to move the lens further away from the camera. That’s what macro extension tubes do.