Sold under a variety of marques as well as GGS. GSS LCD optical viewfinder is designed for LCD screen viewing of digital camera. Especially suitable for DSLR high definition video photography, on-site shooting and viewing the photo, etc.
Two framing mode: 3.0X loupe magnification and 1:1 flip up standard views.
The loupe attachment frame doubles as a screen protector (though some online reviews recommend removing the glass), its attachment is a sticky surface so it is difficult to remove. Additional frames can be obtained, both original and clones, the latter for about $12, usually described as eg "LCD screen frame for GGS 3X LCD Viewfinder Loupe".
Description:
"The advantage of LCD screen buckling connection. Easy to install & remove. Also ensure the safety of LCD.
Support LCD: 3" with ratio 4:3. Compatible for LCD with ratio 3:2.
Completed sealing structure which block the surrounding light while magnification or standard framing. You can see the real color of the image..."
Specifications:
Lens: 3 pieces/group
Magnification: 3x
Diopter: +-3
Transmittance: >90%
Lens Aperture: Dia. 40mm
Support LCD: 3" with ratio 4:3.
Compatible for LCD with ratio 3:2.
Lots of U-tube reviews eg
mediahalo TV 
;)
;)
;)
;)
