Yashica DSB lenses?

[gwhitegeog]

Some guidance please for a newcomer, would be appreciated.
I have just been buying a few lenses to go with my new RTSIII. Combination of C-Z and Yashica. I see that Yashica produced a DSB series (for example, 135mm f2.8 DSB). I read somewhere that these were not 'real' Yashica lenses and not made buy them.
Does anyone know the background to these and their typical quality?
Thanks Gary

 

[mkuhlma]

There is a webpage - sorry, in German - about these lenses.
Here are some details in English about the manufacturers and one of the wide angle lens's qualities.

I read that DSB was Yashica's low budget lens series. I also read that they are not multicoated but only single coated.
Last year I had had two 50 and 55mm Yashica DSB lenses (bought together with FX-3 bodies) but I sold them again because I did not like too much their mechanical characteristics. I prefer heavy Zeiss lenses or at least Yashica ML.

Michael

 

[gwhitegeog]

Thanks, Michael - that's a great help.