Eyepieces with optical glass and a eyecup which replaces Nikon DK-19:
JJC EN-5 Eyecup Assembly allows for more comfortable viewing through the camera's viewfinder, especially for eyeglass wearers. Less stray light enters the viewfinder and a less flared, clearer image with which to compose your shot is provided. The eyecup assembly is made of soft silicone. The ergonomic design will fit your eyes better. JJC EN-5 includes a eyepieces with optical glass and a eyecup which replaces Nikon DK-19. You can still use this eyecup even if you lose the original camera eyepiece. The EN-5 Eyecup Assembly installs easily.and is compatible with Nikon D5, D500, D810A, D810, Df, D4S, D800E, D4, D800, D2 Series, D3 Series, etc.
Product Highlights
Seals out stray light for improved viewfinder optics
Soft silicone material
Allows for eye comfort, especially for eyeglass users
Ergonomic design
Includes a eyepieces with optical glass and a eyecup
Compatible with Nikon D5, D500, D810A, D810, Df, D4S, D800E, D4, D800, D2 Series, D3 Series, etc.
Eyecup replaces Nikon DK-29, compatible with Nikon Z6, Z7:
The eyecup is designed to seal out stray light for improved viewfinder optics. Made of soft TPU rubber, it protects your eyes from scratches, especially for eyeglass users. The eyecup adopts an ergonomic oval shape to fit your eyes better. Besides, the eyecup is 360° rotatable, so you can adjust it for horizontal or vertical view.
Product Highlights:
Seals out stray light for improved viewfinder optics
Soft TPU rubber allows for eye comfort, especially for eyeglass users
Ergonomic oval shape is designed to fit your eyes better
Rotates 360º for horizontal or vertical view
Compatibility Replaces Nikon DK-29 Fits Nikon Z6, Z7

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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