> -----Original Message-----
> From: [EMAIL PROTECTED]
> [mailto:[EMAIL PROTECTED]]On Behalf Of [EMAIL PROTECTED]
> Sent: Thursday, January 18, 2001 6:17 PM
> To: [EMAIL PROTECTED]
> Subject: Re: SMC Takumar 135mm
>
>
> In a message dated 1/18/2001 7:32:24 AM Eastern Standard Time,
> [EMAIL PROTECTED] writes:
>
> > On Peter Jonkman's page the following two 135 mm lenses are listed:
> > http://212.187.14.19/lenses2.htm
> > SMC Takumar 135mm 2,5-22 AUTO 5/4 18 1,5m 444 86 67 58
> > SMC Takumar 135mm 2,5-22 AUTO 6/6 18 1,5m 470 86 67 58
> > The only difference is lenses/elements (5/6 vs 6/6). When you
> see one, how
> > can you tell which is it?
>
> Wieland:
>
> For the 5-element "Model I" -
> The numbers on the DOF scale read as "22168 81622" (with all the numbers
> "squished together", except in the middle, and with no label for
> f/4). When
> set at infinity, the feet scale reads as "10050" ("squished
> together"), while
> the meters scale shows "30 15".
>
> For the 6-element "Model II" -
> The numbers on the DOF scale read "22 16 8 4 8 16 22" (with
> spaces between
> the numbers, and with a label for f/4). When set at infinity,
> the feet scale
> shows "100 40", while the meters scale shows "35 15".
>
> Fred
>
Seems like it's much easier to just say the later 6 element one has
F4 on the DOF scale and the earlier 5 element one doesnt. I cant confirm
above my memory but there is another way to tell too:
6 element is approx 85mm ( 3 3/8 inch ) from flange to front edge when
focussed at infinity
and the 5 element version is only approx. 80mm ( 3 1/8 inch ).
May be obvious but the 6 element version is bigger and better performance
than the 5 element version which BTW is no slouch at all. It's suprising
to me that pentax even bothered to update/upgrade what was already a
very good lens. Especially considering that they had to make it larger.
JCO
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