Originally posted by pepperberry farm Is a 35 mm lens that much of a different view than a 50 mm?
Yes, especially when taking into account the crop factor of the APS-C sensor.
Originally posted by pepperberry farm Is an aperture of f1.8 that much more noticeable in low light than an f2.4?
Yes, however for a wider lens you can use a lower shutter speed (if the object is not moving).
Originally posted by pepperberry farm Should I be looking only at autofocus lenses vs manual?
It depends. I only look for old lenses because of limited funds, but that's only my case.
Originally posted by pepperberry farm I've read from end to end the thread on old manual lenses and how great they are - but is it really just the 'neat' factor of using an old lens vs a new 'plastic fantastic'?
To me, the beauty of these used old glass is that you can get high quality glass for a relatively inexpensive price. However bear in mind that these old glass will exhibit more problems including CA, flare etc. compared to the latest lenses optimized for digital sensors.