How short is short? The Zuiko 28-48 and 35-105 zooms are both excellent IMHO, if a little bulky by today's standards. The 35-105 is my standard lens for general purpose photography.
The 35-70mm f3.5-f4.5 is considered a very good lens, and hardly any bigger than the 50mm f1.8 prime. I have been using a 35-70mm f3.6, but it is big and heavy, and ruins the balance of the camera. So recently that one has been left at home.
I have begun to think just carrying a 40mm or 50mm prime is the better overall choice. You can typically move back and forth a few steps to get the proper composition.
It's perhaps a little heavy by modern standards, but it's fast, sharp and has a nifty continuous focus macro.
Only slight niggle is the Adaptall mount tends to get in the way of the shutter speed ring a little, otherwise I really couldn't rate it higher. Think it cost around £25 from a seller on eBay.
Olympus 35-70 f3.6 - superb two-touch lens with fixed aperture. Rare and sought-after.
Olympus 35-105 f3.5-4.5 - high quality one-touch zoom, going for peanuts on the 'bay these days.
Olympus 35-70 f3.5-4.5 - tiny two-touch zoom, suprisingly sharp a little too much barrel distortion at the wide end for me but a terrific travel lens (weight & size match 50mm primes). Don't confuse it with the inferior Cosina-made f3.5-4.8.
I tried a Tamron 35-70 f/3.5-5.6 (only £4!), It's OK but not all that good... not realy sharp enough. I just got the Sigma 35-70 f/2.8-4 for not much more and it's looking considerably better. Although i've yet to make any big enlargements - comparing negatives on the base board, it's looking very good (certainly sharper than the Tamron and close to my prime's). Hopefuly this will be a keeper! Most of the Zuiko's are a little out of my budget.
To add to my earlier post in this thread re. the 35-70 f3.5-4.5, below is a scan from A4 sized image taken with this lens (original in colour). The printed image is more than sharp enough.
It depends what you're looking for - convenience or quality. I carry a Zuiko 28mm, 50mm, and 100mm, which incidentlally is the one that is used most, superb for isolating and concentrating on the main subject. I don't like zoom lenses. They came into being via the movie industry, which is where they belong. Moving pictures don't need to stand up to the same standards as a still picture, but then if you only print to 6/4, 5/7, what the h***.
Well, after a couple more rolls it seems the Sigma can't compete either. It's very inconsistent between focal lengths although centre sharpness is quite good.
For the moment at least im back to primes. I got a slightly bigger camera bag to make it easier and changing lenses a little quicker, it'll just fit an extra body too - so i've been carrying fast and slow film. Not much bigger than a single SLR bag - i can just get two OMs and 28, 50 and 135mm lenses - and it's not too heavy (can be a problem - broken hips!). One of the good Zuiko lenses is still a future possibility though.
I have the 75-150 constant f4 zoom and it delivers very nice contrast, colour rendition and sharpness. A relatively small and light lens with 49mm filter diameter and built in hood. Also quite cheap now on used market. I will always keep this lens with my OM kit.