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I hate it when products are marketed as "built with aerospace grade aluminum". What does that even mean? It's predictably heat treatable to remove fatigue? It's been x-ay to confirm the material is forged correctly? It's just standard aluminum for crying out loud.

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I’m not justifying the use in this article, but it does mean something. In particular “aerospace” aluminum is a particular range of alloys around 92% pure AL content. It’s use in aerospace applications is based on its thermal stability, strength, lightness and resistance to wear and cracking.

To be honest, I’m not sure that what makes a good regenerative cooler for an upper stage rocket engine makes the best lens case, but it sounds cool right? shrug

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