I have an older Siebert 21mm, 1.25 inch ep. I bought it about 3 yrs ago and have used it in my fast dob with good results. Its no Nagler or Panoptic but it beats all the generic plossls. F.O.V. is 70-80 degrees. There are some blems in the barrel finish but the optics are fine. $30.00 shipped.