I'm offering a trade. My lens philosophy is to buy it now for the best, let everyone else haggle for the rest. I have a Hugo Meyer & co - Goerlitz. Doppel - Plasmat 1:5.5 F=48cm D.R.P. Dr Rudolph. Convertible to 1:11 F=83cm. I've had it for a long time. I just don't want to rip my V-8. Too heavy at 480 not enough camera for the 830. I used it once for night time exposures. 480 FL, 35 min WFO. My red dots don't have any complaints about it living in the bag beside them.