From: todd belcher <todd_belcher@xxxxxxxxx>
Reply-To: rollei_list@xxxxxxxxxxxxx
To: rollei_list@xxxxxxxxxxxxx
Subject: [rollei_list] Re: beautiful packaging
Date: Sat, 24 Feb 2007 13:18:09 -0800
It is a coating problem. Many of the Planars on the Rollei TLRs of this
period have lost or are losing their front coating - not all, or lots, but
many. The darkish areas on that lens are where the coating remains, the
brighter areas have no coating. You can imagine if you removed all the
coating it might be difficult to guess the coating, was in fact, gone and
in many cases, when the coating is partially gone, a 'cheap fix' for an
unscrupulous reseller is to completely remove the coating.
The lens can be recoated, but it will, to a discerning eye, look incorrect
because this era 2.8 Planar has a yellowish front element coating and most
modern recoating will have a purple cast. Later 2.8 Planars do have a
red/purple cast to them though.
Losing the coating on the lens will not have a terrible detrimental effect
on images and you'd be very hard pressed to tell any difference between an
image taken with this lens and a perfect lens. There are 10 coated
surfaces in the 2.8 Planar - losing the coating on one surface is 10% and
that 10% does not mean images made are 10% 'worse'. It means the maximum
possible detrimental effect is 10% of whatever percent the coating imparts
to the image. So if coating imparts 10% to an image then that one coating
imparts 1%. And it would be tough to discern a 1% difference in images.
todd
On 24-Feb-07, at 10:07 AM, Jeff Kelley wrote:
Eric, with that much of the coating gone why does it not have a
detrimental effect? Can a lens in this condition be recoated
successfully?
Jeff
I don't think so, I think it's a coating condition. I've seen it on
many if not most Planars of the era. In my experience it has no effect
on performance...
Todd Belcher or Harry Fleenor might just in here...
Eric Goldstein
--
On 2/24/07, Jeff Kelley <thocker@xxxxxxxxxxx> wrote:
The 6th photo, showing a closeup of the taking lens sure looks on my
monitor
like the lens has a serious separation or fungus problem. I could be
reflections but I don't think so....
Here's a direct link to the photo:
http://worldsbestusedequipment.de/ebay/P2160125.JPG
- Jeff -
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