Hi Henry. If you're looking for a wonderful micro four thirds lens, then the Olympus 12-100 f4 pro lens is the way to go. This lens is on a par with your Nikon 24-200 lens 😊

The OM 40-150 f4 Pro is a lovely lens, lightweight, and good quality  at a sensible price. It's always in my bag when out on a landscape shoot.

My "vacation" lens for Micro 4/3 is my Lumix 14-140mm F3.5-5.6.  Maybe not the sharpest in the world, but very versatile. My Lumix 100-300mm is only used for wildlife.

The 40-150mm F4 pro works very well for the OM-5 and probably more suited to your need than either the 75-300 or 100-400.

Definitely try the Olympus 12-100 F/4 Pro. Brilliant lens and perfect for hiking. The 40--150 F4 pro is also brilliant

Henry, try the olympus 40-150mm f4, it is light, small and sharp, perfect for hiking🎉

I use a number of lenses with my OM-D E-M 1 mk iii, but my usual setup for hiking is the 100-400, plus the 12-100 pro, which as others have mentioned is an outstanding lens. I have a simple sling bag just large enough for the 100-400 with the lens hood attached. I can swing the bag around front and change between the two lenses on the fly. This is perfect when I’m out doing bird photography but want the option to do landscape as well. I rarely use the collar on the 100-400, which saves some weight. Honestly, I adapted to the weight and size of the big lens pretty easily, but it sounds like the 12-100 might suit your needs nicely. You should take one for a spin!

no need to thank us buddy ur an inspiration  you have helped me so so much, the way u xplain things has helped my own photography immensely even wiv my second hand 2000d  now feel comfortable  2 upgrade when i can ur honesty ur passion i love it dont stop bn u buddy it is greatly appreciated 🥰🥰

I use my Canon 100 - 500 often for landscape compositions, I find the best conditions that produce the least disruptive atmosphere is directly after a heavy rain, must somehow clean the air for a short time.  Try leather honey on your boots, sealed mine right up, rub in a few layers.

Back in the day there was a fair bit of climbing done on the the large barrel shaped buttress you were looking at. It was known as "Indian Country"!.... because of the convex grassy slope above belay points were impossible to find.
Back to photography, I use the Panasonic Leica 100-400 with my Lumix G9 and G7 in this focal range for wildlife and birds
Enjoyed the video, ATB Alistair 👍

I think the most common 'super zoom' among the YT photographers I watch is the 100-400 on full frame. What you said about atmospheric disturbance and particulate matter is always going to be a problem with long distances. The amount of days that are excellent for a long lens is a bit limited.
It's probably an excellent lens and if you used it around the town to test it for sharpness etc., then it would probably impress. But for what you generally do...?

Beautiful countryside!! I really enjoy it!! Your area in today's video reminds me of part of the Snake River Valley in Idaho, USA. Beautiful cliffs with the river at the bottom. I always love it when I can visit there. Really awe-inspiring!! Thanks for taking the time to post your videos!!!

I shoot a wide variety of genres , so i have a broad range of lenses , i have 14mm f1.4,  16-35mm f2.8 24-70 mm f2.8,  70-200mm mm f2.8 85mm f1.8,  200-600mm f5.6-6.3  , and all are used for different things , if I'm doing astro landscapes I use the 14mm or the 16-35mm,  if I'm doing landscape I'll take the 16-35mm and the 24-70 mm and the 70-200mm.
For birds / animals i take the 200-600 mm , there are occasions where the longer focal length can get me a shot , I was out doing sunset shots with a narrow band of red sky on the far horizon and the shot looked pants on the smaller focal lengths as too much boring foreground , so on goes the telephoto and got some better shots zoomed in filling the frame with more of the colour and more of the layers of the hills in the distance , they were a bit misty / hazy from atmosphere or heat haze but I didn't mind , my pic was to record the colour of the sky not to record crisp detail in the hill many miles away .
Photography is very subjective , we are in control and the image we wish to capture is how we see , whether that's a simple memory of a place captured just for us , or whether we intend to show that pic to people to tell a story .
Some of my pics are not technically perfect , or compositionally perfect , or pin sharp , but they remind me of a pleasant time and place, and I enjoyed getting out there .

Big and clunky? For a lens that has 800mm in fullframe terms? No, that thing is absofrigginglutely lightweight.

Hello mate! Now, back in the days when I was using my trusty old bridge camera,  which had an equivalent focal length of something completely ridiculous,  I found the same thing.  Especially if I was out in the summer.  It even used to pick up the heat haze coming up from the ground,  let alone all the other stuff in the atmosphere!

Climbing is banned on White Scar which is unfortunate as it is one of the most spectacular limestone crags in the country.
You missed the best bits of Whitbarrow. Carry on to the the summit at Lord's Seat and on the way you'll find windblown yews, juniper and birch with limestone herbs and flowers later in the year. There are also some good bits of limestone pavement and the best stone walling in the Lakes. The long range views to the Lake District mountains and to Ingleborough and Gragareth in the western Dales on a clear day are also excellent.

I love my 100-400mm Nikon on my Z6 II. It's heavy yes, but some photos it would be impossible to take without it. It's life  :)

Hi Henry, I use the 100 to 400 on an EM1X for wild life and motor sport which works quite well, a little soft at the extreme unless stopped down a couple of stops.  The sharpest Olympus lenses are the 40 to150 f2.8 pro which you can use the teleconverters with and the 300 f4 pro prime again you can use the teleconverters with but both are little expensive, I did have the 75 to 300 but gave that to my son with my old OM1 Mk2 as he was getting into photography, stopped down that gave good result except at the very long end.  I understand the Panasonic Leica 100 to 400 Mk2 lens is good and a little smaller and lighter than the Olympus version could be worth a look at.

Recently I swapped to using the pro F4 12-45 and 40-150 lenses on the OM-5, and loving them so far, plenty of reach for me, and still super compact and light.

Nice vid Henry! While you may not be looking for suggestions, the 100mm end can still be used when you want a wider viewpoint, just flip it vertical and take a 3 panel vertical pano. That would've worked nicely for the ray you were attempting to capture. Just a suggestion!