AboutScott Valentine Expertise Most anything about digital post processing (Photoshop, etc), effects, and image restoration, some technical information about digital imaging systems, light and electron microscopy, optical physics and image analysis. I can help with shooting basics, lighting setups, and getting the most out of your digital camera. I am also an 'expert' here for Photoshop (Computers/Technology > Software > Graphics Software > Photoshop).
Experience I've been an image analyst and advanced amateur photographer for over 6 years. I run an Adobe user group, focusing on digital media, and have lectured on digital image capture systems. Currently, I am an administrator for a rather large instructional Photoshop forum
Organizations Adobe User Groups, National Association of Photoshop Professionals, Advanced Imaging Specialists
Education/Credentials Bachelor of Physics, University of California, San Diego
Awards and Honors Winner: Best in Show and several category first place awards - Imaging Professionals of the Southwest Print Competition (multiple years)
Expert: Scott Valentine Date: 7/11/2008 Subject: SLR Lense/Body
Question With a SLR Digital Camera when you just buy the body does it come with a default lens or do you have to purchase a lens seperatly before you can take any pictures? Also what is the purpose of upgrading and purchasing lenses?
Thank You
Answer Good question! Most consumer level dSLRs (digital Single Lens Reflex) will come in a kit with a lens, cleaning set, battery and charger, and may include a strap or other extras. It can actually be difficult to find entry-level models not in a kit. Semi-pro models can be found in kits and as bodies only, while pro models typically only have the body, battery and charger.
The reason for choosing an SLR camera is to have greater control over your photographs. This also typically means fewer built-in program settings. Elements you want to control directly include shutter speed, focal length, aperture and ISO (sensitivity of the image sensor to light). Different lenses have different characteristics, and are typically chosen for focal length and 'speed'.
The speed of a lens refers to its ability to gather light, and typically is related to the size of the aperture. A large aperture allows you to gather much more light, so you can use faster shutter speeds - this is a 'fast' lens. This becomes important when shooting in challenging situations like low light or at sports events (golf notwithstanding).
