Moonlight

by Jakub

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3

This is possible using Sony SLT technology. It would be possible with cameras that use the imaging-sensor to do autofocus, using on-chip Phase-Detect sensors. The reason this is not possible on most cameras is that during exposure the Phase-Detect sensor is out of the optical path. On a DSLR, the mirror goes up to expose the sensor and has to be down to let ...


3

The light path for the autofocus in an SLR (image) sends it through a semi-transparent window in the middle of the mirror (in effect a beam splitter). Light, bouncing off of or being transmitted the mirror will become partially linearly polarized itself (much like the light off of a leaf or water). If the light incoming is linearly polarized, some of that ...


1

It depends on what you mean by more accurate. The same algorithms are used in either AI Servo or One Shot to get an initial focus on what is in the viewfinder at the selected areas of AF sensitivity. What happens after that may affect how well your subject is in focus in either mode. With One Shot the camera stops all AF focus activity once focus lock is ...


1

No, the half press of the remote is the same as a half press of the shutter button. I suppose this makes sense for a landscape shooter who doesn't want to mess up his focus when using the cable release, but can be annoying for other uses. Would be nice if the cable release buttons could be reassigned like the others in the menu, but I think internally they ...


1

The two lenses you are using are notoriously slow focusers. Good event photographers know they need the high quality fast lenses, both in terms of aperture and AF performance which are interrelated, that can make their job not only easier, but possible at all. Gear doesn't matter - is only half the truth. The other half is - until it does. When the technical ...


1

One of the best methods I have found that has worked well for me, is Zone focusing. I always aim to use a Manual focus lens with Hyperfocal Markings on it(However, it doesn't have to have these markings and a 50mm f/1.8 will work just as well). These provide the distance of the DOF within a given Aperture size based on how far the focusing distance is and ...


1

The driven part of the AF coupling in the lens should be easy to turn for the entire travel. Most of the mechanical parts that make the AF happen are toward the front of the lens, so removing the lens mount and poking around isn't likely to net you anything. In your situation, I'd send it in if you can't get a refund. $200 for the lens plus $375 for Nikon ...


1

It seems like newer Tamrons have problems with the autofocus motor. My 70-200/f2.8 VC had the same symptoms and after a while it stopped focusing but was repaired through warranty. I hear similar stories about the new 24-70/f2.8 VC as well. First of all go back to your camera store and let them check it out and show you how it works. If there's a problem ...



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