58mm filter Does it fit on Nikon 50mm 1.8G lens?

If the lens filter thread size is 58mm, it will.

Does it reduce the sharpness when used on Gh4?

I did not find any reduction in image sharpness when used on Fuji xf18-55. Basically it is a polarizing filter with a regulatory ring. That's all.

Can it attahes a lens hood

The lens hood attaches to your lens itself without issues. Only thing is, you might have to put your finger inside the lens hood to make use of the cpl.

ASIN	B00004ZCFQ
Audio Recording	No
Best Sellers Rank	#3 in Camera Lens Polarizing Filters
Brand	Tiffen
Built-In Media	Camera lens filter
Coating Description	No Coating
Color	Circular Polarizer
Compatible Devices	Cameras with 67mm lens thread size
Customer Reviews	4.6 4.6 out of 5 stars (8,060)
Enclosure Material	Aluminum, Optical Glass
Global Trade Identification Number	00049383046717
Has Self-Timer	No
Item Dimensions L x W	4.1"L x 3.6"W
Item Weight	30 Grams
Manufacturer	Tiffen
Media Type	ProductImage, EnhancedContent
Model Name	67CP
Photo Filter Factor	1 x
Photo Filter Size	67 Millimeters
Screen Size	67 Millimeters
Special Effect	Polarizer
Thread Size	67 Millimeters
UPC	049383046717
Warranty Description	10 Year Manufacturer
Water Resistance Level	Water Resistant

Tiffen 67CP 67mm Circular Polarizer

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