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Olympus 28/2.8 & Pentax-M 50/1.4 - Atlas V Launch
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PostPosted: Wed Jan 21, 2015 10:29 pm    Post subject: Olympus 28/2.8 & Pentax-M 50/1.4 - Atlas V Launch Reply with quote

SMC Pentax-M 50/1.4



Olympus 28/2.8



A while back somebody requested more gear carnage... SRB byproducts (including hydrogen chloride) have probably finished this 28.





PostPosted: Sat Jan 24, 2015 4:43 am    Post subject: Reply with quote

I'm not sure the lens killing is worth it. Sad


PostPosted: Sat Jan 24, 2015 12:29 pm    Post subject: Reply with quote

Great images and thanks for sharing,was the Olympus damaged during the taking of these shots? Sorry if I miss the obvious but what is the meaing of the SRB byproduct?


PostPosted: Sat Jan 24, 2015 4:59 pm    Post subject: Reply with quote

This rocket had five solid rocket boosters (SRBs) on it. Their exhaust is quite a bit nastier than a liquid rocket, which produces water vapor or CO2. One of the chemicals in SRB exhaust is hydrogen chloride, which mixes with water from the launch pad's sound suppression system to produce hydrochloric acid.

The lens was essentially hit with highly concentrated acid rain as the exhaust plume settled. Hundreds of small pits have been left in the coating of the lens.


PostPosted: Sun Jan 25, 2015 2:20 am    Post subject: Reply with quote

Shocked Thanks for the explanation,I guess there is no way to protect the lens, and a sacrifice has to be made.It did its job admirably and you got the shot. Smile


PostPosted: Sun Jan 25, 2015 6:12 am    Post subject: Reply with quote

Luckily I don't kill lenses very often. This one won't be used for any launches from here on out, but at larger apertures in typical lighting the lens performs fine. At smaller apertures with incident lighting, the lens looks like a kaleidoscope.

This particular 28 has never really gotten my attention as anything special, but then it had to go and make that nice flare. I'm considering replacing it.