[rollei_list] Re: Bellows on 2.8D?...an answer from Mr Prochnow
- From: Jerry Lehrer <jerryleh@xxxxxxxxxxx>
- To: rollei_list@xxxxxxxxxxxxx
- Date: Sun, 21 Aug 2005 15:16:59 -0700
Jens,
It's time for you to STFU! The so-called bellows only is on certain
2.8 Rolleiflexes like the D, E, E2.
Jerry
J Patric Dahlén wrote:
> It's not a membrane or a diaphragm. It's just a 3 x 102 mm strip of velvet
> felt, just like the light trap in sheet film holders. It's glued in a slot
> sround the lens hole in the camera body. If it looks like it moves, it's
> just the fibers bowing when the lens tube moves.
>
> The ring Prochnow talks about, that "looks different according each
> calculation" could be the lens tube. The velvet felt is just a light trap,
> and can't do anything to improve the results other than avoiding light
> leaks.
>
> I got a new lens tube in one of my Rolleis I sent for repair. Don't know why
> it was replaced (the old one looked good in my eyes), but the repairman
> didn't charge me anything extra for that.
>
> /Patric
>
> >From: Carlos Manuel Freaza <cmfreaza@xxxxxxxxxxxx>
>
> >Yes Richard, I have seen again the Rolleicord IV and
> >really it has a membrane or diaphragm that appears
> >when you put the focus mechanism at the minimum
> >focusing distance, it has a reddish color and it's
> >very different regarding the system for the 2.8C,
> >while the 2.8C is similar to your 2.8E, (it moves
> >following the lens movement as Todd explained), the
> >Rolleicord IV membrane or diaphragm(there are no
> >"bellows" here) is invisible till you advance the
> >lens to the minimum focusing distance (0.80m), that
> >was the reason I did not see it before. As Prochnow
> >wrote, the diaphragm, (or short "bellows" or membrane
> >or whatever) looks different according each
> >"calculation".
> >The Rollei TLR cameras anti-reflection system are very
> >effective according my experience; of course, as you
> >wrote, it is not perfect if you shoot into the sun,
> >but for this case it sometimes helps to obtain a bit
> >of flare control enough for some detail in the photo.
> >Perhaps that issue about the roller reflection seen in
> >some cameras has something to do with problems for
> >this "diaphragm".-
> >
> >All the best
> >Carlos
>
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