Welcome to PF from an Australian of Irish descent.
Originally posted by deco009 what lenses would be good to purchase next. I am looking for something weather-sealed preferably because Ill be spending time down beside the cliffs of Moher for the summer
Beautiful place to photograph.
What you get will be governed by your budget and your preferred focal length.
I agree with @Kozlok - on a tight budget, the DA 18-135 is hard to beat amongst WR lenses. See this thread for examples:
DA 18-135 WR, Show us what it can do - PentaxForums.com
If your budget would run to a DA 16-85 or a DA 20-40 Limited, each of those is a great option as others have mentioned. The reliability problems with the DA*16-50 f2.8 (which is also WR, like all DA star lenses) that have been mentioned (which make it more affordable second hand) are about its autofocus motor - but if that fails it can easily be converted to screw-drive autofocus.
If you want something wider, the only WR option would be the DA*11-18 f2.8. Wonderful lens by all accounts, but very expensive.
But while WR is handy, with a bit of care and common sense you could get by with a non-WR zoom, like the DA 12-24 f4 or the Sigma 10-20 f3.5 or f4-5.6. They will be much cheaper. The DA 15mm f4 Limited is excellent too, although not WR.
I endorse what Tom (@Ramseybuckeye) said about tripods too. If you haven't already, get a quality one - it will transform your landscape photography. Carbon fibre ones are lighter weight, but good quality alloy ones are cheap on the second hand market.
Last edited by Des; 06-03-2021 at 02:46 PM.