Here's a little insight into the photographic gear I use. This is mostly kit for street and urban photography (this includes London's architecture and urban landscapes too) although each lens has its application and strength.
1 - Olympus M.ZUIKO Digital 75mm f1.8 (150mm full frame equivalent)
This is a phenomenal prime lens. Ideal for portraits because of it's focal length resulting in less distorted, more natural looking shots, it also provides a beautiful shallow depth of field. It's built like you'd want a lens to be, cold metal, heavy and with a smooth focusing ring. It's got quality written all over it. Great too for street photography if you don't like to be too close to your subject.
2 - Voigtlander Nokton 17.5mm f0.95 (35mm full frame equivalent) aka "The Tank"
My current favourite, it spends most of its time attached to my E-M1. Manual focusing prime and currently one of the fastest MFT lens on the market. Now be warned...it's heavy, weighing in at a whopping 540g!!! But there's just something very special about this lens. I wasn't one to manual focus much but I got used to it in no time and absolutely love it, especially with the focus peaking on my E-M1. The image quality is excellent and you can shoot in low light to such an extent that I am always surprised. To many, this is the perfect focal length for street photography.
3 - Rokinon 7.5mm f3.5 UMC Fisheye (15mm full frame equivalent)
Another manual focusing prime. If you want a bit of fun, get a fisheye lens. And actually it can work great in street photography especially combined with the art filters from the E-M1 such as cross-process or tilt-shift. Also interesting used to shoot skateboarding/ers and London urban landscapes.
4 - A7 leather camera strap
Get rid of your standard "out of the box" strap. This is not just an exercise to look cool, but you'll see how comfortable these A7 leather camera straps are. I actually own two. You'll also be less noticeable shooting street photography than if you had Canon or Nikon written all over you like a tourist.
5 - Mount July Filters
I was given a set of coloured Mount July filters to test exclusively here in the UK. These screw on like normal filters but add a retro/trippy look to your photos. Quite interesting results which I will post sometime soon.
6 - Olympus OM-D E-M1 with HLD7 detachable battery grip
I recently upgraded from my trusty E-M5, find out why I upgraded here!
7 - Panasonic Leica 25mm f1.4 (50mm full frame equivalent)
When not shooting with my Voigtlander, then this is my second favourite lens for street photography. The image quality is second to none and a fantastic lens to use in low light. It happens to also be great for portraits and even landscapes (as you don't have the foreground in the shot, not usually the best part anyway).
8 - Panasonic Lumix G X Vario 35-100 f2.8 (70-200mm full frame equivalent)
Everyone needs a telephoto lens in their camera bag. This one's secret? It's a constant f2.8 aperture lens, so it's fast all the way through. And again, image quality is excellent. I actually use this one a lot in street photography. It's the lazy option as I have no need to get too close, but some days I just don't feel like invading people's space so I go sniper mode.
9 - Panasonic Leica DG Macro-Elmarit 45mm f2.8
The name gives it away, yes... it's a macro prime lens! I've had tons of fun shooting macro when I first got this lens. Check this:
But then as I'm more of an urban photographer I found that actually it's also great for portraits and street photography. Although I use it a lot less than the rest of them.
10 - Olympus FL-600R
Now you may think.. "what's that got to do with street photography kit?". Truth be told I don't use this in the street, but a flash is important and as I also do jobs on the side, this is in my bag.
Of course this is my large "general" bag. When I head out to shoot knowing I will be walking for hours, I take a smaller bag with me with only a couple lenses.
Add a couple extra batteries and a spare OM-D E-M5 with the kit Olympus M.ZUIKO 12-50mm (just in case) and that's it.