Extend Threads Of Lens Filter
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Related Faq
Q
For the 52mm version, what size are the outside (female) threads?
A
the outside (female) threads is 58mm. 
Q
how far does the horizontal arm extend for overhead/birdseye view?
A
If I measured correctly it could extend about 12 inches. If you have a heavyweight camera or it has a bigger lens you may have to shorter the arm to balance the weight. 
Q
Does it have threads on both sides to add another filter?
A
Yes, it has threads on both sides but they do not have the same diameter. For example, if the filter is 77mm, the outer part is 82mm. 
Q
Male or Female threads?
A
Female threads 
Q
Does the filter have a thread on the front to allow another filter to be mounted to it?
A
Front threads are available, allowing another filter to be attached to it, as long as it has the same aperture 
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