Thank you very much for viewing. The Nikon AF-S TELECONVERTER TC-20E III is an aspherical teleconverter with a 2x magnification. - Model: AF-S TELECONVERTER TC-20E III - Magnification: 2x - Characteristics: Aspherical (Important) There is no dust or mold inside the lens. Operation has also been verified and there are no problems. The feature is that it's a very convenient focal length-increasing item to have, as it covers the areas where the focal length of the lenses you currently own is insufficient. It can only be used with Nikon lenses and is not compatible with third-party lenses, so please be aware of this. Also, the f-number decreases by two stops. The reason for selling is the decrease in usage frequency due to the change from Nikon lenses to SIGMA lenses. After purchasing it on Amazon for 31,000 yen, I used it a few times and then switched to SIGMA lenses. The photos at the end are examples taken using the teleconverter. Since this is a used item, returns are not accepted. We are of course open to price reductions and immediate purchase. Please consider it.