Schneider Symmar 180mm f/5.6 - 315mm f/12 which element?

[Gundus]

Hi,

Recently i bought a Schneider Symmar 180mm f/5.6 convertible to 315mm f/12 and i was asking if someone has the same lense so i could know which element (front or rear) do i have to unscrew to get the longer focal (315mm).It's all to tigh...

Do you know also if there is a preview lever in this lense? or the focus is done with the "T" mode?

And also what you guys think of this lense

Thanks in advance

[Chauncey Walden]

Remove the front. Isn't there a little tab you can pull out near the speed setting mark?

[Peter K]

Do you know also if there is a preview lever in this lense?

If the lens is mounted in a Compur MXCRI there is a lever at the right of the speed setting mark. You can press this lever if the shutter is cocked to open and pull to close it again.