No, to your first question, but it might have had an effect on rangefinder cameras, 6cmx9cm, 4x5, 5x7, 8x10 field and view cameras, twin lens reflex cameras from Rollei and Mamiya and the Russian imports, Koni Omega Rapid and other press- and event- friendly cameras, and others.

Real cameras will continue to evolve, and just like the early digitals bear little resemblance to what is out there in form, function and image quality, we won't recognize a digital image capture device 10 yrs from now if it were handed to use today, along with the computing device that you'll need to work on the images.

I'm not sure all of the Nikon speakers here are fluent in Nikon. DX and FX I understand, but Ex? Common but not format designations are AI, SA, ED, AL, IF, SDM, VR. Or we have a joker or Canon discrimination.

To answer your question as most said, DX is for Cropped Factor, FX is for Full Factor. DX & FX lenses may be used on DX cameras; only FX on FX. Yes, many older Nikon film lenses may be used with Nikon DSLRs, but check for specifics and restriction.

For comparison the similar current "terms" for Pentax are DA and FA, and D FA to complicate things a bit. Only the lens are so marked though. The old K, M, A, F designation were for Pentax film lenses.

Once came by the tail end of a photo shoot and noticed they had tied up a bed sheet from a couple trees. (I still don't know if that was for an outdoor backdrop, shading, or to reflect light a bit.) Anyway I guess all turned out well until they started to disassemble things. They couldn't untie the rope to the sheet/tree.

No one had anything to cut with so I handed them my Swiss Army Knife. One guy yelled out those things are not sharp at all and it wouldn't work on nylon rope. I just smiled and told them to try it. Like cutting warm butter, my knife went through the rope. The guy's jaw dropped!

That leads me to wonder:

1 How many carry a knife with them? (short of an airport, etc.)
2 How many keep it sharp?
3 For those who do, what do you sharpen with?

For me, 1 = Yes, 2 = Yes, 3 = A small ceramic "dog-bone". (I hold the knife still at angle and slide the dog bone across, most of the time sliding out to the tip of the blade.)

He sees men with dark skin. They must be Iranians. He shoots them.

I can understand that people want to kill terrorists, but workers of Indian heritage employed by Garmin are not Iranian terrorists. The US Census estimates that there are about a million Iranians living in the USA. Many Sikhs have been killed because stupid people though they were Arabs. Do we have an open hunting season on Arabs? I know there is strong sentiment against "brainy" people who are "overly educated," but there's also a case to be made for somehow getting enough basic knowledge into the thick skulls of the millions of truly dangerous people around us - the stupid ones.

https://www.washingtonpost.com/news/post-nation/wp/2017/02/28/fbi-investigating-shooting-of-two-indian-men-in-kansas-as-a-hate-crime/?utm_term=.3b3f389444e3&wpisrc=nl_rainbow&wpmm=1

Both of my dslr's have four batteries each. I've had battery grips on them so two at a time is normal. All the batteries have been marked as to when I purchased them. Two factory batts came with the purchase of Pentax K20D camera with grip in March 2009, (8 years old). A non-factory batt on January 2010, (basically 7 years old) and another non-factory batt on March 2011, (6 years old). They all get regular use since I switch then around all the time.

Last year I noticed the non factory batts were getting a touch snug in the camera portion of my K20D but they came out fine so I let things go. This "snugness" slowly increased over six months and became, (for lack of a better word), "snugger".

Tonight I used them at a high school basketball game and found the camera battery was almost impossible to remove. I had to pry it out with a dentil pick since nothing else was small enough to reach in. Looking at both non-factory batts, I noticed a very small bulge. The two factory batts are 1 to 2 years older but do not show any signs of bulging... yet.

Looking at my other camera Pentax K5, all four of the batts, (purchased June 2013, almost four years old), are non-factory and are all just starting to feel snug in the camera body.

Recapping batt conditions:
LI50 = 8 YO = Both Pentax batts are good.
LI50 = 6 and 7 YO = Both non-factory batts do not fit well at all.

LI90 = 4 YO = All four non-factory batts are just starting to swell a bit.

Question:
Yes I know it's time to replace a bunch of batteries but I'd like to know what caused them to slightly swell up and why the non-factory only. (Are they that cheaply built?)