Pentax Wide Angle Adapter
Related Faq
Q
Does it track body based on different setting points or based on the wide camera detection?
A
Our Solar Outdoor Camera is based on wide-angle camera detection  
Q
What is the vieweing angle of the camera?
A
Hi, thanks for your inquiry. It comes with 180° wide viewing angle. 
Q
What lens hood will work for this filter?
A
I have the 77mm version of this and I am NOT able to use a lens hood on my Canon 17-40mm wide angle once the filter is on. I haven't tried putting on the hood first and then trying to screw on the filter yet. That's not to say that all lens hoods won't work but for me it does not under the scenario described above. 
Q
X cross happened on variable ND filters
A
"X" cross on images is a common issue with wide angle lenses and variable ND filters. Physics limit the capabilities of variable ND filters on wide angle lenses.
When you enter the edge of the max range,the "X" issue may appear on your image. Because you are using it beyond its capability according to the laws of optical physics,which will inevitably cause this phenomenon.
 
Q
Does this fit a Tamron 77 wide angle lense?
A
you said (Tamron 77 wide angle lense?) the lens info can't be right! do you have the full name of the lens. 
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