As many have said this adapter is beautifully engineered and has a solid no-nonsense feel and weight to it. It has its own plastic clip-lid box.This (together with a Nikon G adapter from the same company) was the second I ordered in two days as I found a M42 lens just after I had ordered the Nikon adapter.They are both superb and literally - if you look at the illustration on the box lid - do what the box says they do. In the case of the older screw in lens attachment takes seconds and the installation is firm and solid.A few words of caution however.Your camera and the lens it has available for it have been designed as a system. Everything is balanced in terms of size and weight - things you considered and appealed to you when you bought it.Adding a lens not designed for your camera will throw all out of balance - literally.In addition lens designed and made decades ago were the best they could be for the price at the time. Their performance was often stellar, sometimes rubbish and usually OK.In some ways these lens can be seen as motor cars from the 1960s.You may admire a classic sports car like an E-type Jaguar or similar. You may have had one at the time and remember how it performed or you may simply want to drive one.But the experience may not be as you remember or imagine. Your beautiful head turning sleek car is probably very uncomfortable by today’s standards. You may not be able to find some where to drive it to the maximum. It may become a ‘Sunny Sunday’ car, only coming out when the weather is perfect and sitting in the garage most of the time.Your old lens may be like that sports car.‘Good glass’ optimised for film cameras from years ago may be unforgiving on a digital sensor. Modern focusing aids like peak focusing may not always work. Your idea of getting a cool looking cheap super telephoto lens by using an adapter on a 2x crop sensor in practice may result in a ‘monster’ you can use only in certain specific, limited circumstances.And as stated at the top of this review your camera may feel heavy and unbalanced - something to consider, especially if you have small hands or arthritis.But if you have read this far and are prepared to accept that you may not get an award winning photo first time - or indeed ever - simply want to experiment and at the same time improve or recapture your photographic skills and not rely on your modern digital camera doing all the thinking, then your camera, this adapter and that lens in the garage or cupboard or drawer will get along fine.And best of all you will have fun and may even surprise yourself.