Right angle viewfinders?

[Kostas Papakotas <clenchedteethphotography@xxxxxxxx>]

Anyone has experience with devices like this?

 

http://www.bhphotovideo.com/c/product/41121-REG/Pentax_30148_Right_Angle_Finder_A.html

http://www.bhphotovideo.com/c/product/440311-REG/Zigview_SCV100B_Zigview_B_Digital_Angle_Finder.html

http://www.bhphotovideo.com/c/product/438058-REG/Dot_Line_DL_0099_Angle_Viewfinder_Magnifier.html

http://www.bhphotovideo.com/c/product/430420-REG/Hoodman_HRAV_H_RAV_Professional_Right_Angle.html

and this

http://www.dealextreme.com/details.dx/sku.2329

 

I do wish ti try it out since it will help with concert shots but I do not to get a useless thing.

 

thanks beforehand, Kostas

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kostas papakotas / clenched teeth photography 
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