Quote:
Originally Posted by Xrundel
Take it easy - you did just fine.
Periscopes was not useless at night, trust me on that. Ghunter Prien would not be able to sneak in Scapa Flow at night without using one.
I've look throgh Russiam periscope of old (1956 project) Russian diesel sub with periscopes of same (stolen/copied after German's of course) optical train. They not so dark that you can not see anything at night.
I prefer instead of googling things speak up my own life experience.
When certain amount light enters hole 50mm diameter and ends up in hole 5mm diameter (size of your pupil) it got INTENSIFIED. It's a flow of photons - think about it as an air flow. even if 50% of the total amount photons entered got reflected back or dispersed due optical imperfections - still you receive more light looking through scope than just looking using naked eye.
That's just the laws of physics and light is nothing more than another short-wave radiation.
You did good job with your mod. Just my personal experiense and education made me make some suggestions about that maybe it is better under-do some thing than over-do. It just a suggestion, not personal insult. So please take it easy.
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I am taking it easy. I'm not calling you names and demanding an apology. I'd just appreciate something substantial, something factual.
We know pretty much everything needed to apply the proper formulae, make some calculations for the proper brightness of the final image. So if you know how to make the scopes more realistic, I'd gladly hear it.
Quote:
Originally Posted by Xrundel
" As much light as possible" with given objective lens/primary mirror aperture
Majority of amateur refractors (lens design, not mirror) are in range of 60-80mm aperture. I had one with 175mm - just the objective assembly cost $10,000 US. Most people just can't afford it for hobby.
Think about that sentence of yours - just does not make much sense, Germans are the best in the world when it comes to engineering and they are very detail-oriented people. Putting anti-reflection coating on optics when no one in the world even consider that says everything to me. I don't know why I even need to explain myself in such a detail.
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Think I got it close enough for someone who has no education in or experience with optics. You're avoiding the point I was trying to make: you can't compare a telescope to a WWII submarine periscope.
You keep claiming the Germans were the best in the world, but that really doesn't mean much. Even if their scopes had 0,001% better light transmission, it would make them the best. The report Steve linked to states German scopes were comparable in performance to US ones at the time, so the difference wasn't big enough to be remarkable.
Besides, I modeled them using what knowledge I could gather on
German scopes. Didn't just yank some random values from somewhere.
I would kill for a picture taken with a modern camera through one of those scopes.
btw thanks Steve. That's the report I couldn't find previously.
