Olympus-OM
[Top] [All Lists]

[OM] Re: A lens to supplement my 50mm/1.8 Zuiko

Subject: [OM] Re: A lens to supplement my 50mm/1.8 Zuiko
From: Moose <olymoose@xxxxxxxxx>
Date: Thu, 23 Mar 2006 21:01:32 -0800
Andrew McPhee wrote:
> At 01:40 AM 24/03/2006 +0000, you wrote:
>   
>> ...I've also been trying to figure out what the red/green lines on the barrel
>> of the Tokina actually mean - ISTR there being a post about this on list, but
>> the search engine turned up nothing. One straight green line, with a red line
>> starting from the same point
Shouldn't be exactly the same point, fairly close, but offset.
>> , but ending up about 1/2in away at the front of
>> the lens, with the 80 / 100 / 135 / 200 markings on the left)
>>     
Like this <http://moosemystic.net/Gallery/tech/CRW_2293.jpg>? I have 
another Tokina RMC 80-200 around somewhere, but Tokina's IR markings are 
consistent across the zooms I have.
> I don't have that lens, but my guess is the red line is for infra-red 
> focusing.  When using IR film frame the shot and focus as normal then 
> before taking the photo re-adjust the focus point from the green to the red 
> line.
>   
Exactly right!
> The reason for this IIRC is that IR waves are longer (or shorter?) than 
> light waves.
>   
Longer.

Moose

==============================================
List usage info:     http://www.zuikoholic.com
List nannies:        olympusadmin@xxxxxxxxxx
==============================================

<Prev in Thread] Current Thread [Next in Thread>
Sponsored by Tako
Impressum | Datenschutz