Exceptionally good professional service, and I highly recommend him. I recently sent a Nikon F Photomic FTn prism metering head to Robert Decker for cleaning, reconditioning and calibration. With proper battery voltage (1.35V + 1.35V = 2.7V), the meter needle was moving sluggishly, not moving full-scale, and was producing a consistent 3-stop error. Also, there was a hitch in the prong-slider as it passed through its mid-point (~f/5.6, where the slider resides with the prong retracted, and when using the "stop-down" method of exposure for special components etc). Robert cleaned, repaired all, and returned the unit to me expeditiously. It works as good as new in all regards, and for the very reasonable price originally quoted. read more