Right Angle Finders

A right angle finder is an L-shaped optical accessory with a mirror/prism angled at 45 degrees. It attaches to the viewfinder eyepiece of your SLR camera allowing you to look downwards into the viewfinder rather than the usual direct view. Angle finders are ideal for macro photography and similar situations where the camera is low to the ground making it awkward to get a comfortable view looking through the viewfinder directly.

They are also ideal on a copy stand when the camera is at a high position and you would need to be a giant to look over the camera.

Some are lifesize view with full screen image showing camera exposure data others also have a magnifying lens to deliver a 2x or even 2.5x view, making it a useful focusing aid. The periscope often rotates so you can shoot in horizontal or vertical format. They usually also have an eyepiece adjustment, making them perfect for spectacle wearers too.

Below is a guide to right angle finders, past and present:

Seagull

This Chinese product is a solidly made with a 1x and 2.5x viewing magnification. It has 360deg rotation, click stoped at 45deg intervals and has an adjustable dioptre eyepiece. It is bundled with 5 mounting pieces enabling it to be attached to most cameras made by Canon, Nikon, Fuji, Sony, Konica Minolta, Olympus and Pentax.

Technical Spec
Lens Construction: 9 elements in 5 groups,
high quality glass roof prism.
Magnification:1X
Angle of rotation:360 degrees
Diopter adjustment:Built-in (+/- 4) for variations in eyesight
Eyepiece fittings: Canon EOS, Nikon, Minolta, Leica, Pentax & Olympus
Adapter:Plastic slot-in type
Dimensions:60 x 35 x 85mm
Weight: 82g

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Hoodman H-RAV Universal

This Chinese product (identical to the Seagull) is a solidly made with a 1x and 2.5x viewing magnification. It has 360deg rotation, click stoped at 45deg intervals and has an adjustable dioptre eyepiece. It is bundled with 5 mounting pieces enabling it to be attached to most cameras made by Canon, Nikon, Fuji, Sony, Konica Minolta and Pentax. These include the Nikon 22 rectangle (fits on Olympus E-300),Canon 22mm, Nikon round 22mm, Universal 19mm (Tried on KM Dynax7D and Sony Alpha 100), Canon 18mm

Hoodman Reviewed here

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Fotodiox Right Angle Viewfinder Pro-1

This independent brand has a built-in diopter for individual eyesight adjustment. It has a magnification ratio of 1x or 2x and comes with five adapters for Nikon, Canon, Konica Minolta, Olympus, Fujifilm, Leica, and Pentax, it is also compatible for Hasselblad and Mamiya medium-format cameras with optional adapter. Also included is a protective case and a blower brush.

Technical Spec
Optical construction: 9 elements in 5 groups and angle prism.
Magnification: 1x; 2x
Rotation: 360 degrees
Dioptric correction range: +/- 4 dpt
Dimensions: 60x35x85mm

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Vintage Right Angle Finders

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Specifications of camera eyecups

Canon 18 mm adapter

for: Canon EOS10D, EOS20D, EOSD30/D60, EOS300D, EOS350D, EOS400D, Digital Rebel, EOSXT, EOSXTi, EOS10, EOS66, EOS88/88QD, EOS100, EOS300/300V, EOS500/500N, EOS700/750, EOS850/888, EOS1000N/1000FN, EOS1/1N/1D/1V

Nikon 19mm round

for non high eye-point viewing eyepiece thread including: F, F2, F3, F3AF, FA, FE, FE2, FM, FM2, FM3A,
and Nikkormat series.

Canon 22 mm adapter

for: EOS350D, EOSD30, EOSD60, EOSEOS EOS10D, EOS20D, EOS50D. EOS 3, EOS5, EOS30, EOS33, EOS55, EOS50E

Nikon 22 mm adapter for: D100, D200, D80, D70, D70s D50 F80, FE10, FM10, F70D, F65, F60D, F55, F70, F50D, F301, F401, F501, F60, F601, EM, FG, FG20, N50, N55, N60, N65, N70, N75, N80, N2000, N2020, N4004, N4004s, N5005, N6000, N6006 and Pronea 6i

Nikon 22mm round

high eye-point viewing eyepiece thread including: D1, D1H, D1X, D2H, D2X, F3HP, F4, F5, F6, F100, N90, N90s, N8008 and N8008s.

Universal 19mm

Konica Minolta Dynax7D and Sony Alpha 100
Minolta: no adapter is needed (use adapter #5)
Pentax: K10D, *ist Digital, *ist DL2, *ist DS2,*ist DL, *ist DS, *ist, ZX, PZ, LX, M & Program Series no adapter is needed for SP, M, K, Z, P, (use adapter #5)
Fujifilm: S3 Pro, S2 Pro, S1 (use adapter #2)
Leica R9,R8,R7,R6,R5,R4,R3 (use adapter #1)
Olympus E300, E330, E500, E20, E10, E100 RS (use adapter #5)