Digital LCD Ultrasonic Tape Laser Meter Pointer + Distance Measurer Overview
Features:
The ultrasonic distance measurer +laser point is a perfect tool to quickly know the distance, area and volume of a room! It can measure distances in a straight-line from 1.5 Feet to 60 Feet. Your distance measurer transmits ultrasonic waves to a point you want to measure. Afterwards, it measures the time taken by the waves to reflect and then calculates and re-transcribes the distance.
Specification:
Unit of Measement Feet or Meters
Measure Distance From 1.5 Feet to 60 Feet or 0.45m to 18.288m Area, volume, addition, subtraction calculation.
Frequency: 40kHz (ultrasonic pickup)
Resolution 0.01M or 1/2 Inch
LCD with Backlight.
Caution:The laser emitted from the unit is visibale laser of 650mm wavelength.
Power supply: 1 x 9V Alkaline Battery (not included)
Dimensions: 155mm x 70mm x 30mm
Package includes
1x Ultrasonic Distance Measurer (battery Not included)
1x English Manual

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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