You are right, Dave.
Here are two more interesting facts about the quarry:
It is the same geologic layer as Niagara Falls. A few eons ago, something slammed into Michigan, uplifting that layer, now at the surface near Chicago and in upstate NY.
Half of the quarry is now sealed off, to be used as an overflow reservoir for the Deep Tunnel Project, which is designed to stop flooding in Chicago. Having reversed the flow of the Chicago River, the city does not drain into Lake Michigan--a heavy rain causes flooding.

Hello

I'm recently retired from the National Park Service and have rediscovered my old film SLR cameras. I kind of forgot how much I used to enjoy this. Oh sure, I've taken loads of family photos with my phone or little digital point and shoot, but had put away my SLR cameras years ago.
With plenty of time on my hands now maybe its time to get back to it.
Heck, I may even break down and pick up a decent DSLR if I can afford it. I'd welcome suggestions on a good fun DSLR (new or used) on a retirees income? The cost of film development will get to me sooner or later I guess.
Anyway, Here are a few of my favorite photos that I took some time ago at Theodore Roosevelt NP. Feel free to comment and I'd welcome critiques. They may even be scans from prints if I remember correctly.
My other hobby is wooden boat building and restoration .
Thanks

BillO

Yep, the high voltage transformer and associated chokes ARE heavy - the HV supply for the amps I mentioned weighs about 65 lbs. Completely agree about the performance of tubes vs transistors when overdriven - it’s for that reason you still find tube microphone preamps in many high-end recording studios, even today. Regarding the sampling rate, while 44 KHz is adequate to accurately reproduce the highest typical audio frequency we hear (per Nyquist), higher sampling rates mean the filter on the output of the D/A can have a more gentle slope, resulting in lower distortion. Again, I know this is WAY off-topic, but I couldn’t resist.

Cheers

Cool! To understand exactly how theses lenses work, the best source is at www.red.com
There is a great write up there about how this cinematographic optical method worked on film and how in translates into digital photography. As you will read, the lens does not work on its own and magically produce a panoramic image. In film cinematography it requires anamorphic projection equipment. In digital still photography the compression/decompression of the aspect ratio takes place in post processing.

My good friend Camille, sadly, passed away several years ago. He was a cinematographer who worked with The National Film Board of Canada and was a full time cameraman for the Canadian Broadcasting System. He was also an avid collector of old motion picture equipment and would buy obsolete or surplus equipment at bargain prices from the two aforementioned organizations. He hoarded so much heavy "junk" that his wife divorced him.

One day, I was at a photo flee market where I spotted a cute little anamorphic lens kit designed for a Super 8 movie cameras. Knowing that Camille had a vast collect of
Super-8 gear, I pick it up- though it would cheer him up. So... I went to visit Camille and presented him with the lens. He opened the little red case, smiled, thanked me profusely, and said in his inimitable Egyptian accent "This is nice LITTLE anamorphic lens- now I show you REAL anamorphic lens". He reached under his bed and dragged out this LENS, it was the size of a LARGE deluxe microwave oven and emblazoned on its giant lens shade, in raised chrome-plated letters was "PANAVISION 70"! I immediately realized why his wife packed him in- aside form the 6 5-K Fresnel spotlights in the living room! He told me that he was keeping the lens awaiting the Film Board's disposal of the camera.

So, for those interested, you can have your very own 82mm CPL filter-only$108.55 and for a mere $18,700 (U.S) more, you can have the Magic Anamorphic Lens Set to go with it. Check it out at B&H Photo! It's a bargain!