A very good product at a moderate price this variable adapter for filters eg for Canon G10-12. The article makes a good quality impression. The cultivation was smooth despite the lack of instructions. After first tests, however, a common terminals made during retraction and extension noticeable and you had to follow suit by hand pressing or. Hopefully this does not indicate a defect in the springs, which would be fatal. In the hope of improvement I forgive 4 stars, is subject to change in return / exchange. Addendum: The products had to be unfortunately complains because errors in spring mechanism. The seller responded promptly and efficiently and sent replacement. This is now free of errors. I now forgive 5 Stars. A special praise the seller.
