To which Gregg wrote back:
I assumed he didn't have one and wanted to go with what was available. Get
the extension tube and it can be used on either end of the lens.
Frank responded:
> Gregg wrote:
>
> >It's bright and cheap, but be careful of the unprotected front of the
> >lens (back element) as you are moving forward and backward to focus.
> >
> >Gregg
>
> Or put an extension tube (e.g. 14mm) on the new front for protection
> of that back element.
> I prefer the cheaper manual one: this will also let me preset the
> aperture of the reversed lens if I wish to stop down for a bit depth
> of field.
>
> Frank van Lindert
> Utrecht NL
>
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