Re: [OM] Why you should never point your 250/2.0 into the sun

[Piers Hemy]

But if you insist on pointing optical equipment at the sun, I can recommend
the products of Thousand Oaks Optical

http://preview.tinyurl.com/2y7cj

Their solar filter sheet material was perfect for the Tamron mirror lens
which I used on a 3Ti during the total solar eclipse in 2006. With plenty
left over for a DV camera and solar spectacles!

Piers

-----Original Message-----
From: Chuck Norcutt [mailto:chucknorcutt@xxxxxxxxxxxxxxxx] 
Sent: 24 December 2009 02:29
To: Olympus Camera Discussion
Subject: Re: [OM] Why you should never point your 250/2.0 into the sun

Based on reports I have heard regarding telescopes pointed into the sun I
suspect that that an SLR (assuming focus at infinity) would first see the
focusing screen melted followed by cracking and/or separation of the
eyepiece behind the pentaprism.  Telescopes eyepieces with elements tightly
constrained within metal cells may explode with some vigor due to thermal
expansion.

Chuck Norcutt


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