Excellent condition K&F CONCEPT M42-FX mount adapter with case @4239 Excellent condition. *Regarding precision instruments and lens optics* * I do not have specialized knowledge, so please purchase after confirming the images. * I carefully check the optics and cameras, but I cannot confirm everything perfectly, so please make your judgment based on the images. * I do not use strong light to check the optics. I describe what can be confirmed with normal light and visual inspection. * I do not perform test shots with the lens using an actual camera body. * Please understand that I do not check for obvious overexposure. * Maintenance and cleaning are performed, but I do not guarantee perfection. *This is based on the subjective opinion of our maintenance staff, so please use it as a reference. There are individual differences regarding the condition of scratches and dirt, so we cannot accept returns based on the condition. Please consider the product images. We will consider a discount for multiple purchases, so please feel free to comment.