I haunt eBay looking for lenses at reasonable prices. I have bought several at great prices over the years since I got my first DSLR.
Many sit, unused, on a shelf. Many have been sold. And, yes, a few were unusable due to fungus, scratches etc.
I use, in no particular order, a Pentax 55-300, a Pentax FA43mm Ltd, a Pentax 50mm manual lens (25 years old and still producing great image quality), the Pentax kit lens 18-55mm (non Weather Resistant version) and until recently, a Tamron 70-300.
I needed (wanted? lusted after?) something wide, something medium, something macro (truly macro, not just close-focusing), something long, all with image quality to die for - well, don't we all?
So I was thinking, which are the most respected lenses in those classes for a Pentax camera? And which , of the ones I selected, were the ones I could afford?
Here is what I came up with:
Sigma 10-20mm F4-5.6 EX DC Lens - wide angle, made for digital with a great reputation (for those examples that work properly!)
Pentax 18-55mm F3.5-5.6 AL WR - wide to normal, weather resistant. It's the default kit lens, but it is a good lens from f4 up, far superior to other kit lenses out there.
Pentax 50mm F1.7 - a "nifty fifty" normal that is, even after 25 years, one of the top 50mm pentax lenses ever produced.
Pentax 55-300mm F4-5.8 - short telephoto to long(ish) telephoto - a lens that always punches above its weight class.
Sigma 70mm F2.8 EX DG Macro - macro and 105mm equivalent (it's designed for full frame cameras).
I did the maths, took a heart attack at the total price, then logged onto eBay, and in an orgy of selling, made enough money so that I could add just a bit and get the missing lenses from my line-up.
I chose the Sigma 10-20 over the Pentax 12-24 F4 because it was £160 cheaper and scored only marginally less in reviews. I was concerned over the reports of "dud" lenses (not sharp across the lens, back focusing, front focusing etc.), but when I dug into it, I found that the vast majority of reports were years old, and it is a known fact that Sigma are trying much harder these days.
The 18-55 kit lens is weather-resistant, a good lens and a good all-rounder for urban areas (and I already owned it).
The Pentax 50mm is a superb portrait/ normal (75mm equivalent in full frame terms) and produces excellent image quality - and I already owned it.
The Pentax 55-300mm is a great all-round lens when there is plenty of light, and can be a great walk-around lens. It is relatively cheap, being a consumer grade lens, but it does have excellent image quality - and I already owned it.
The Sigma 70mm has, in most peoples opinion, too short a working distance for insect photography, but that's ok, as I don't particularly want to photograph insects - I like flower macros which don't move (and don't bite or sting, either!). it is also a noted portrait lens with superb sharpness and colour rendition. It has review scores marginally better than the closest Pentax equivalent (the DFA 105mm Macro).
All in all, I am pleased with the spread of these lenses, the usefulness of them all, and the image quality of them all.
So my LBA stops now. Really. I mean it. No more!
Here are some macro shots of household items using the Sigma 70mm - and one of a "normal" shot.
For those into setups, here is the setup used to photograph the household objects:
Natural light only, from the window at the left.