I use one on a Pentax 24-70mm filter size 82mm. Just make sure you buy the right size for your lens. I have the nd1000, and I am very happy with result. They also sell adaptor step down for your other lens. 

There are 2 reasons why an order might not appear in your Order List.

1. The payment system encountered an error when you placed the order(failed order);
2. You placed your order as guest (without logging in to a Kentfaith account first).

If you encounter any of the above situations, don’t worry. First, make sure that you have completed your payment by checking your PayPal account for the payment information. Then CONTACT US by providing the transaction ID, invoice ID or your PayPal email address and our customer service center will resolve the issue.

 

Yes. I have the same lens and adaptor on my Sony a7ll and it works beautifully. The m42 is also known as the 'universal' mount as other 3rd party camera and lenses also used it. I own 6 other K&F e-mount adaptors to different lens makers (ltm, MD, CF/CD, Nikon) and they all are well built with a nice snug fit. Highly recommended. 

K&F have a list of which adapter will work for each lens to camera combination they support 

I actually have not received this adapter yet. It's shipping from China. Don't think that was disclosed in the ad. However, I do not believe this is for the Pentax Q body rather for digital and film cameras that take the Pentax K mount in its many variations. So I'm expecting to be able to mount my Leica M mount lenses on my digital and film Pentax K mount cameras, no autofocus or relay of exposure information, only to be used with manual focus and exposure.