Originally posted by Jodokast96 Sure, a 1 stop over exposure is an issue, but don't tell me that it "constantly over exposes by 1.3 stops", because it is not true for everybody. You spread that around like it's the gospel, when the reality is, it's not. A K10/K20 + a TC does not automatically equal an issue. I can't use a split screen with my K10 and get correct flash exposure, and could measure it and make a chart showing the 4+ stop under exposure. But I don't tell everyone using a split screen it's a constant issue, because like myself with a TC, not everybody has that same experience. Instead of spreading it around and holding it up like the Holy Grail, I bring it to light to those that actually experience it as to what the cause may be.
The specific point, and the discussion I have made in the past is based upon the performance of the K10D/K20D with the stock screen.
The +1-1.3 stops is with an F2.8 lens.
If you ever bothered to look at the chart I have posted in the past, and look how one of these cameras meters with a lens at F2.8 where no aperture data is present, and then look at how it meters at F4 or F5.6 with no aperture data available, then you will see how the error evolves. The K10D/20D tend to under expose by about a stop on manual lenses at F2.8. The camera when used with an F2.8 auto aperture lens adjusts for this because it KNOWS the wide open aperture, but adding a 2x TC without changing the data leaves the camera still thinking it has an F2.8 lens but in reality it has F5.6 so there is an error introduced.
This is the way the camera with stock screen works.
ANT teleconverter that simply feeds the aperture values through without modification will do this.
If you use a TC that modifys the aperture reading no you won't get this, but the only TC I know of personally is the SMC-F 1.7x AF Converter. It corrects for aperture. Perhaps some of the tamron and kenko TCs for the PZ1 are the same, I don;t know, I don't have them..
As for gospel, perhaps it is not but it should be. Cameras are mass produced devices under high quality standards, I do not believe myself and the others have special modesl which behave differently. All the cameras meter the same.
As for spreading the word.
WHY NOT this is supposed to be a forum where we help others avoid issues, and some of that means posting what we have observed, so people can make decisions based upon the experience of others.
Would you prefer that I comment back, sure it works great, and then have people complain I didn't tell them about the exposure issue. That is not the purpose of the forum