Redrock Micro SD 55mm 8x Achromatic Lens has been discontinued, here are some related products you might like:
The Redrock Achromat Lens is a high quality lens especially designed for macro (extreme close-up) images, including the Redrock M2 Adapter. This lens can be used standalone for remarkably clear images of very small or very close subjects.
This achromat is different than the 55mm Universal SD/HD achromat that Redrock offers with the microX Bundle for M2 cinema lens adapter. This achromat is designed for use without a flip accessory. This achromat is not designed for use with the M2 Encore