[ATM] Theories on what causes TDE

[hermit at outofoptions.org (Ken Lowther)]

How much correction does a 4.25" F7 need?  It can't be too far from spherical. 
Mabye less strokes and more "turning and walking" to get it even?

Ken

Quoting lance clarke <alaskawolfjoe@hotmail.com>:

> I'm currently trying to figure a 4.25" F7 and having a harder time than the
> 8" F5.5 I did last year.
> It just doesn't seem to respond to the same strokes as an 8".
> Anybody else find smaller to be harder?
>
> I want to try a gregorian some time, but if I have this much trouble doing a
> 4", I would think the gregorian secondary would be murder!
>
> >There comes a point at which the entire mirror fits into the palm of the
> >hand and that is a tendency to do.  I prefer to do it with finger tips in
> >the leading and trailing positions, as many fingers as necessary to fill
> >the
> >backside and over the edge a little to control the mirror.
> >About a year back, I did a 4.2" F4 mirror and that was fun!
> >Bob May
>
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Hermit, holed up in Youngstown, Ohio