TriX Loc: Raleigh, NC

In fairness (and expecting multiple flames from Olympus users,) does the OP really want to invest in a company like Olympus with such an uncertain future? Now that they have been bought by essentially a holding/divestment company, no one know if there will even be an Olympus camera division going forward or support for M43. Will there be R&D, manufacturing, warrant/support, spare parts, service? As good as their existing products are, there are excellent alternatives with solid financials.

https://www.digitalcameraworld.com/news/olympus-brand-name-will-continue-but-micro-four-thirds-future-not-confirmed

https://fstoppers.com/originals/demise-olympus-how-and-why-did-it-happen-and-what-does-future-hold-495764

Genessi Loc: SoCal

Sony RX10 IV

CO

I've seen it done that way. I will get longer piece of rope and try that sometime.

amfoto1 Loc: San Jose, Calif. USA

There are any number of smaller, lighter mirrorless cameras.

I'd be a bit worried about buying an Olympus right now. The company has been sold and the buyers won't be keeping the Olympus name, so Olympus will no longer exist in 2021. It remains to be seen if they will continue support for Oly cameras and lenses in the future. The company that bought Oly... JIP or something like "Japan Industrial Products"... also bought and maintained the VIAO line of laptop computers... But in some other cases they've bought companies, broken them up and sold off the pieces. However,
Panasonic sells M4/3 cameras and lenses that are interchangeable with Oly if you really want M4/3.

But, the highest resolution M4/3 camera is 20MP... some are only 16MP or even 10MP.

You might want to consider an APS-C camera. Some of them are nearly as light and small as M4/3, in spite of having slightly larger, higher resolution sensors.

For example...

Panasonic GX85 (M4/3, 16MP) with 12-32mm kit lens.... 16 oz.
Fujifilm T200 (APS-C, 24MP) with 15-45mm kit lens... 18 oz.
Nikon Z50 (APS-C, 21MP) with 16-50mm kit lens... 19 oz.
Sony a6400 (APS-C, 24MP) with 16-50mm kit lens... 19 oz.
Canon M50 (APS-C, 24MP) with 15-45mm kit lens... 19 oz.
Canon M6 Mk II (APS-C, 32.5MP) with 15-45mm kit lens... 19 oz.

All the above except the last have built-in electronic viewfinders. The Canon M6 II is often sold with an accessory electronic viewfinder that fits into the hot shoe (EVF-DC2). That adds a few oz. to the weight, I'm sure. I'm including it here because with over 32MP resolution, it's actually got 50% MORE pixels than your D750!

For comparison, I don't know what lens(es) you use with your D750, but with the usual kit 24-120mm it weighs about 40 oz. So any of the above cameras would shave off considerable weight.... Around half. And there's only 2 or 3 oz. difference between the APS-C cameras and the M4/3.

There are also some very compact lenses for mirrorless cameras, which would be great for street photography. With that in mind, I'm considering getting a Canon EF-M 22mm f/2 "pancake lens" to use with my Canon M5 (discontinued, but essentially the same 24MP APS-C as the M50 above). That's an extremely compact and unobtrusive lens. I don't know that anyone is offering anything quite as small and light, but there are some pretty compact lenses in all the systems.

The Nikon Z50 would probably be able to use any existing lenses you've got for use on your D750, via an adapter... although you may not save as much weight doing that. Nikon has been on some pretty unstable financial ground the last few years, but hopefully will get through this rough patch in time (all camera manufacturers have had soft sales the last couple years... it's just hit some worse than others).

Some of the cameras and/or lenses have image stabilization, which can be quite helpful when trying to steady a handheld shot. You might already have experience with Nikon VR, Tamron VC or Sigma OS stabilization on some lenses you're using with your D750. Some cameras have in-body image stabilization, done by shifting the sensor to compensate, instead of correcting it optically in the lens. Others have it in the lens, as is the case with all the Nikon DSLRs like yours. A few have both. (Don't confuse digital stabilization that some cameras have only in video mode. It doesn't help with still photos.)

mdoing

Olympus or Lumix M43 is the way to go for lightness, Fuji is a little heavier but that new X-S10 looks pretty sweet. I have Lumix G9 and GX-85, so light that sometimes I carry both so I don't need to change lenses. M43 lenses work on both Olympus and Lumix, I might get an Olympus body to play with also. Canon R5 looks awesome but I don't think I want to reverse back to the big stuff. M43 photo quality is excellent. FF is better in low light but so what? if you can't carry it. Keep on shooting!

ronpier Loc: Poland Ohio

When I want to go light I use my D3400 and any of my Nikkor AF S or AF P lenses. The camera weighs next to nothing and many of the lenses are very light also. My back is very happy with the combination and image results are excellent also.

Greenhi

I have an OM D 5 MK2 and love it. With a pancake lens I can actually put it in my pants pocket. When using my large Pro lens it is still much lighter than your old camera. I am 75 myself.

SuperflyTNT Loc: Manassas VA

7 pages in I’m sure you’ve gotten lots of advice but I’ll add mine anyway. I shoot a Nikon D500, a Nikon Z7, a Panasonic G9 and a Sony RX10MIV and there are things I love about them all. I absolutely love my Z7 and it’s surprisingly virtually no bigger than my M4/3 G9. Where the G9 really offers weight savings is in the lenses. For air travel it really cuts down my luggage space and weight and the image quality is very good. I can whole-heartedly recommend M4/3. That being said, I bought the G9 before Nikon came out with the Z50 or I might have gone that direction for the ability to use all my Nikon lenses on it.

BuckeyeBilly Loc: St. Petersburg, FL

See if any of these might work:
https://improvevideostudio.com/top-5-lightest-dslr-cameras-in-2020/

BebuLamar

Actually the best way to reduce weight is to go for smaller format rather than switching from DSLR to MILC. Although the MILC body is smaller and lighter than the DSLR but when you add the lens (especially long ones) then for the same size sensor the MILC isn't that much smaller or lighter.

alggomas Loc: Wales, United Kingdom.

As suggested would get image stabilization if you have to go SLR.
I'm getting older and my Canon kit is getting heavy.
I bought a fz200 and a fz1000. Both Panasonic and good quality without having to lumber yourself with heavy gear.
There are if course better bridge cameras but I'm happy with using mine.

Peteso Loc: Blacks Hills

The OLY MFT is excellent. Suggest you get a lens with in-lens image stabilization (ILIS), which makes a big difference when combined with IBIS.

photoman43

The earlier comment about the weight of the lens is very important. You may have to consider a new body with a fixed zoom lens that is light weight. I would suggest cameras with a 1 inch sensor and a lens with the focal lengths you need is what you may need. Sony and Panasonic make a bunch of them as does Canon and others. DP review is a place to go to do some research.

If you stick with dslrs or mirrorless you still may need to use a mono pod to stabilize things.

aellman Loc: Boston MA

B&H photo is a great source of info on such things. Call them for all the education you will need.

TriX Loc: Raleigh, NC

I can easily see going from FF to crop or maybe even 4/3, but going down to a 1” sensor may be a big shock in several areas. Not that there are not good 1” cameras, but it’s a huge jump down in terms of performance