Philips Bulb:
Philips Essential Halogen 20W
Halogen 12V Dichroic Reflector
20W
GU5.3
12V
36°
2000h
UV Block
Instant 100% light up, no warm-up time
Cool Beam
Osram:
Osram Decostar 51 S Star 20W
44860 WFL
12V
GU5.3
36°
20W
210lm
Deco
Cover
Halogen
Product Benefits :
Brilliant accent light
Dichroic reflector reduces the heat in the light beam by up to 66%
Approved for use in open luminaires
UV filter
Contains no mercury
Areas of application :
General lighting
Entrance lighting
Workplace lighting
Kitchen lighting
Mirror lighting
Object lighting
Product Features :
Average life : 2,000h
100% dimmable
Colour rendering index Ra : 100
Diameter : 51mm
Deco cover

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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