What You'll Get
- One-Hour In-Studio or Garden Photo Session for Up to Five
Autofocus: Searching for the Sharpest Image
Manipulating all your camera’s controls while composing a shot can be overwhelming. Read on to learn how autofocus takes some of that hard work off your plate.
The human eye is among nature’s most complex objects, so it’s no surprise that a camera’s autofocus function should require a lot of little moving parts—and still not be able to focus as rapidly as an eye. The basic components of all autofocus systems are the same: based on information received from sensors, a tiny computer tells a miniature motor how far to move the lens in or out. Where autofocus systems diverge is the method they use to assess the visual field—active or passive.
With an active system, the camera emits a signal in order to detect the distance of the subject from the camera, not unlike a bat using sonar to find a delicious speck of stardust. This could, in fact, be a high-frequency sound wave, but most of the time it’s an infrared signal. The camera sends out pulses of infrared light, which bounce off the subject and are reflected back to the camera, which registers the time this reflected signal takes to travel and moves the lens accordingly. There are some limitations to this process, however. For instance, infrared light from an open flame or a prankster’s laser pointer can confuse a sensor; dark objects can absorb the light instead of bouncing it back, and the system is most effective with subjects within 20 feet of the camera.
Passive autofocus systems, on the other hand, make their decisions based on contrast rather than distance. Under the assumption that higher contrast means a sharper image, the lens will move back and forth until it finds the distance that creates the most contrast. In fact, if you’re not sure which kind of autofocus your camera has, this property suggests an easy test. Aim your camera at a blank wall, or a patch of blue sky free of sky written marriage proposals. Then push the shutter button halfway down. If the camera can’t focus, it’s a passive system: because there’s no contrast, the system’s little brain won’t know when to stop whirring.
The Fine Print
Promotional value expires 120 days after purchase. Amount paid never expires. Limit 1 per customer, up to 3 additional as gifts. Appointments required and subject to availability. Merchant cancellation/re-scheduling policy of 24 hours applies; voucher subject to forfeiture. Please call at least 2-3 weeks in advance to book appointment. Groups over 5 people will be charged an additional $8 per person for the session. All services must be redeemed during a single visit by the same customer; Merchant is solely responsible to purchasers for the care and quality of the advertised goods and services.
About Alex Ginsburg Photographics
What services does your business offer and what makes your business stand out from the competition?
We photograph families, children, high school seniors and groups. We do a lot of commercial photography as well, such as head-shots, products, architecture and company events. We also offer photo-restoration, where we can restore damaged or faded portraits and replace missing parts in an image.
We create images that are not only beautiful as fine art but reveal to the viewer a little bit of the subject's soul. Our clients walk away with having a great experience, usually one that they did not expect to have.
What was the inspiration to start or run this business?
I want to be able to create memories for families as their kids grow and capturing that moment in time when a family gets together. I love knowing that people will smile for many years to come as they remember their experience creating and enjoying that image.
What do you love most about your job?
I love working with many different personalities and also dealing with the many different challenges that arise each and every day. Those challenges keep me staying creative and learning new things and ideas.
What is the best reaction you've ever gotten from a customer?
The best reactions that I receive are the tears when a client looks at the images that we have created for them. Those HAPPY tears mean that my work has touched their heart, which is what every artist strives to achieve.