Every lens I’ve had that had a filter tray or internal filter mount like this has required a matched thickness filter in the tray to achieve their best performance. Even my Sigma 600mm reflex does.
G > On Jun 28, 2021, at 3:19 PM, Mark C <[email protected]> wrote: > > On 6/28/2021 1:49 AM, David Mann wrote: >>> On Jun 28, 2021, at 5:22 PM, jtainter <[email protected]> wrote: >>> >>> Bill wrote: >>> >>> "Does anyone know if the above mentioned lens needs a filter in the filter >>> drawer to achieve it's maximum magic? >>> "Thanks" >>> >>> Bill, the F* and FA* 600 F4 lenses do require a filter as part of the >>> optical system. I would therefore suspect that the A* 600 does also. >> I just had a look at the optical diagrams on the K-Mount Page. The F / FA >> optical diagram shows the filter as part of the optics but the A* 600/5.6 >> doesn't. I certainly wouldn't take that as gospel as I don't know where >> those diagrams come from. I'd tend to assume that any lens with a filter >> drawer would need the filter. Clear as mud :D >> >> Cheers, >> Dave >> -- > > Interesting note about the optical diagram. I've had the question about > filters on the A* 400 f2.8 and its optical diagram does show a filter in > place. never thought to check that. I always used a UV filter with that lens > but wondered if it was really needed. > > Mark > -- %(real_name)s Pentax-Discuss Mail List To unsubscribe send an email to [email protected] to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions.
