Verito question

[dsphotog]

OK, I learned (from you guys) that the verito is convertible....
Any ideas about an aperture scale, when using just the rear element??
David Silva

[Pat Hilander]

I think it just doubles-wide open would be f8.

[Mark Sawyer]

Pat's pretty close; it almost doubles. The 18" converts to a 30", the 14.5 to a 24", the 11.5" to a 20", and the 8.75" to a 14". I think they all work out to about f/6.7, so just subtract about a stop and a half from the existing scale.

[Pfeiffer Duckett]

Not to hijack the thread, but when using the extention cell converting the 18" to the 22.5" is there any change in speed?

[Paul Fitzgerald]

Pfeiffer,

the apparent diameter would not change but the focal length does so it would drop to f/5. (18"/4.5 = f/4 22.5"/4.5 = f/5)