The C615 HD Webcam from Logitech is an exceptional webcam for use with Windows and Mac computers. The webcam features an autofocus lens that is capable of capturing 1080p HD video at 30 fps and 8MP still images. The camera supports 720p HD video at 30 fps for web chats, and features built-in microphones with noise-reduction technology for capturing clear, clean audio.
This webcam supports one-click video upload to Facebook. It will also let you log in to your computer system via facial recognition. Logitech Video Effects allows you to add cool special effects to your chats. With this webcam, you will also get access to the Logitech Vid HD calling network. This webcam can be mounted on a tripod, can swivel 360°, and can also be folded up if you want to take it on the road.
Full HD 1080p Recording
You can record in breathtaking widescreen Full HD 1080p at 30 fps
Also supports 720p at 30 fps
Also supports 480p at 30 fps
Also supports 360p at 30 fpsHD 720p Video Calls
You'll get 720p video calling at 30 fps on most major instant messaging services and Logitech Vid HD
Note: For Mac computers, HD video calling is currently available on Logitech Vid HD and FaceTime HD. For HD video calling support with other video-calling applications, please check the web for availability and support informationOne-click Upload to Facebook
You can easily capture HD video (1080p) and upload it to Facebook, Twitter, or YouTube with just one clickPremium Autofocus
Your images stay razor sharp, even in close-ups (up to 10cm from the camera lens) with the built-in autofocusSmoother, Sharper, Richer, and Clearer
Logitech Fluid Crystal Technology. It's what makes a Logitech webcam better. It's smoother video, sharper pictures, richer colors and clearer sound in real-world conditionsLogitech More HD
Thanks to More HD this webcam doesn't compress video during a call, so your image stays HD-clear and your computer runs more efficiently- even if it's a little old. Windows onlyVersatile, Portable Design
The fold-and-go design and short USB cable make it easy to take your webcam with you, while a USB cable extender gives you plenty of slack when you need itSwiveling, Tripod-ready Design
You can attach a tripod for more placement options. Plus, the 360-degree swivel makes calling and recording easier at any angleMac and Windows Versatile
Windows? Mac? iChat? Skype? Google Voice and Chat? It doesn't matter. It works with what you have. Plus, if you want to edit your pics and photos, it's compatible with iPhoto and iMovie-even Photo Booth
Note: iMovie does not directly support external webcams. You can use the included Logitech Webcam Software to record and export video captured by a Logitech webcam into iMovie8MP Snapshots
You can take high-resolution snapshots at up to 8 megapixels (software enhanced)Face-Recognition Login
Log in to your computer and your favorite sites with the included face-recognition software. It'll save you time and impress your friends

Medium Format
Medium format refers to the size of your roll of film (or if you’re talking digital, it’s the size of the camera sensor). It really just means that you are shooting on a bigger piece of film than you do with a 35mm camera. The increased size of medium format film means a much larger negative. This will give you finer details and less grain.
Choosing your Right Medium Format Camera
Twin Lens Reflex (TLRS)
TLRs use two objective lens of the same focal length. The photographic objective lens is the one that is used to take the picture. The other lens, called the view lens, is connected to the viewfinder. Most TLRs are fixed focal length, and the more expensive models may incorporate a rudimentary room function. Most TLRs use a leaf shutter system, resulting in high speeds, quiet operation and low shutter vibration. There are also close-up, wide angle and telephoto adapters for TLRs.
Some popular TLRS cameras are: Yashica MAT-124G, Rolleiflex 2.8F, Minolta Autocord and Mamiya C330


Rangefinder
Rangefinder cameras are medium format cameras with a range finder. This negates the waistline, viewing that most TLRs carry. They are also much smaller than TLRs, and allow for easier point and shoot photographs. They tend to have limited focusing ranges, and do not have lenses larger than 180mm or 200mm. Rangefinders are quieter and easier to focus in dim light. They are mostly fixed lens models, but higher range models also provide for interchangeability.
Some popular rangefinder cameras are: Fujica G690, Mamiya 6/7, Bronica RF645, Norita 66 and Pentax 67
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