day, June 28, 2004 10:50 PM
Subject: Re: Lens manufacturing
> You are right. Today this must be completely automated with only
> inspection/rejection of elements for all but the very finest or very
largest
> (and most expensive) lenses. FYI, the need for accuracy increases with
lens
> dia
they are very expensive lenses.
Herb
- Original Message -
From: "Jens Bladt" <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Sent: Tuesday, June 29, 2004 3:27 AM
Subject: RE: Lens manufacturing
> Not according to fotoMagazin/Olympus. They hand polish the lenses
amera system. I believe
Olympus mad a clever choise in this respect.
Jens Bladt
mailto:[EMAIL PROTECTED]
http://hjem.get2net.dk/bladt
-Oprindelig meddelelse-
Fra: Herb Chong [mailto:[EMAIL PROTECTED]
Sendt: 29. juni 2004 01:34
Til: [EMAIL PROTECTED]
Emne: Re: Lens manufacturing
if they have
if they have to do any hand work on the elements for even 1% of them, the
price of the lens would skyrocket.
Herb
- Original Message -
From: "Bob Blakely" <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Sent: Monday, June 28, 2004 4:28 PM
Subject: Re: Lens manufactu
28. juni 2004 22:29
Til: [EMAIL PROTECTED]
Emne: Re: Lens manufacturing
I have made lenses before - for a homemade telescope. I did it years ago for
the "experience." I used "crown" glass and "flint" glass bought from a
scientific supply company. The glass came as fla
I have made lenses before - for a homemade telescope. I did it years ago for
the "experience." I used "crown" glass and "flint" glass bought from a
scientific supply company. The glass came as flat, round disk pairs, one
became the "tool" and the other the lens. I worked them against each other
usi
28-200mm is Tamron one, I thought ...
-Message d'origine-
De : Mark Roberts [mailto:[EMAIL PROTECTED]
Envoyé : lundi 28 juin 2004 12:40
À : [EMAIL PROTECTED]
Objet : Re: Lens manufacturing
"Jens Bladt" <[EMAIL PROTECTED]> wrote:
>Do Pentax make ALL their ow
Does the glass production (raw, unpolished lenses) take
place in Pentax own factories or do all camera manufacturers buy their raw
lenses from a few big factories.
Most do. Minolta has (or had) its own factory though and, in the
60s, 70s and 80s at least, mentionned this in their booklets, adding
The word from Pentax sources is that the only "current" lens not actually made
by Pentax is the 100/3.5 Macro (Cosina). Supposedly they had too many problems
with the Tamron made lenses.
--
Fred wrote:
Do Pentax make ALL their own lenses
All except the 100mm f/3.5 macro.
How about the current
on 28.06.04 13:57, Fred at [EMAIL PROTECTED] wrote:
>> All except the 100mm f/3.5 macro.
>
> How about the current FA 28-200/3.8-5.6 AL [IF] - might it be a
> Tamron, perhaps?
Yes it is, and older 28-105/4-5.6 (IF) comes from Tamron too.
--
Best Regards
Sylwek
>>Do Pentax make ALL their own lenses
> All except the 100mm f/3.5 macro.
How about the current FA 28-200/3.8-5.6 AL [IF] - might it be a
Tamron, perhaps?
Fred
"Jens Bladt" <[EMAIL PROTECTED]> wrote:
>Do Pentax make ALL their own lenses
All except the 100mm f/3.5 macro.
--
Mark Roberts
Photography and writing
www.robertstech.com
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