Macro Reverse Ring Lens Adapter (Canon EF Mount) Overview
Using this reverse adapter ring, you can turn your medium-telephoto lens into a macro lens. It allows you to reverse mount the lens and attach it to the camera body, allowing you to achieve macro photography with a regular lens. It is commonly used on SLR digital cameras to reverse the lens mount for macro photography.
A reverse adapter ring is a method of attaching the front end of the lens (the filter end) to the camera body via a bayonet-screw reverse adapter ring for macro photography. The principle is that the back focal length of lenses under 85mm is generally shorter than the front focal length. Reversing the adapter shortens the effective focal length, thus achieving a close-up effect. For example, a standard 50mm lens can achieve a 1:1 image-to-object ratio when reversed.
Material: Metal
Color: Black
Functions: Fully manual focus, full manual aperture
Aperture conversion: One side mount, one side screw-on
Super macro effect: You can reverse the lens and attach it to the camera body, achieving macro photography with a regular lens.
Advantages:
1. Further increases the distance between the lens and the focal plane;
2. Excellent results when shooting 3D objects;
3. Simple and inexpensive.
Note: In addition to this aperture, you can use adapters to convert to other apertures as needed.
Also, you can use this aperture with any lens mount.
Another advantage of reverse mounting: as long as the reverse mount ring and the camera body have the same mount, the camera body and lens can have different mounts. For example, a cheap Russian ultra-wide-angle lens can be reverse mounted on any camera body, achieving a huge magnification. However, a reverse mount lens will still be a reverse mount lens!

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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