Help with a wide angled lens for my K1

Hi everyone... I need to pick the brains of the existing K1 users. Ive just ordered a K1 from Srs.. I'm fairly well covered in the long lens dept for full frame lenses.. But dont have any Super wide lenses. As at present I like to use a Sigma 10-20 for my street photography on my K5II.. I thought I would plump for the Pentax 15-30. But having just seen the price..I'm going to have to think again.. So I was just wondering as to what the K1 users were using to cover their wide angle needs...Or do I just need to save up ?

One a bit cheaper here:
https://www.lcegroup.co.uk/Used/Pentax-15-30mm-F2.8-ED-SDM-WR-***MINT&BOXED***_1...
Warning - it is heavy, not only in price!

If you want a real bargain, seek out a Pentax 18-35 which used to be the kit lens with the initial DSLRs. It is full frame though and perfectly usable while you're saving up. Well under £100.
https://www.harrisoncameras.co.uk/pd/Used-Pentax-AF-18-35mm-F4-56-Lens-AL_USED-1...
Otherwise seek out a prime of your preferred focal length. Neither the Samyang 14mm or the Irix 15mm will completely break the bank, nor will they break your back carrying them! But they're not zooms of course.
You might even get by with your 10-20 by restricting it to around 17-20mm, room to experiment with that.

If you can find an SMC Pentax-FA 20-35mm f/4 that will serve well. They are rather rare though.

To go wider, the Samyang and Irix lenses are a good place to look. The Samyang 14mm f/2.8 is relatively inexpensive and also very sharp.

Thanks both Johns... Something to think about there.. Though non auto focus lenses arnt much use as you regularly dont get to raise the veiwfinder to the eye and have to use a lot of guesswork... Interesting point on using APSC lenses in the full frame mode.. Is there a listing anywhere as to how much vignetting eacl lens actually produces ?

With super-wide lenses you get huge depth of field (and trying to be selective with it can be a problem), not having AF isn't really a big deal. The effects of vignetting from APS-C lenses on FF depends on focal length and selected aperture. Most lenses suffer from light fall-off towards the corners to some degree - how obvious it is varies with subject and scrutiny etc.

John.

The 15-30mm is a lovely lens, everything looks much brighter in the viewfinder when I swop over from the 28-105mm. It is expensive though and if you want filters, especially for landscape, you have to use the Lee Filters SW150 system which will add a few hundred pounds and take a lot of space up in the bag. There are a new wide angle prime and ultra wide angle prime plus a fisheye zoom in the lens roadmap but progress seems slow on that front.

Not really an issue with a super wide. If you want to be inconspicuous the 15-30 isn't the lens to go for as it's quite large. Something like a 20 or 24mm might be worth considering and set it to its hyperfocal distance to get a wide depth of field. With the 14 / 15's you'd have to poke the camera up really close or your subject will be a speck in the distance though DOF is even greater. Many compact cameras of the past didn't have focussing and relied on a default hyperfocal setting, allowing around anything from 5 feet to infinity to be in focus (albeit there really can only be one point of true focus.)
With the 15-30 you'd need to put the camera to the eye to see the field of view, so why not use that approach to focussing a manual wide lens? Have it pre-focussed, or guess the distance and set it directly the old fashioned way. Its not hard to guess 5, 10, 20, 40 metres or whatever but if that doesn't come naturally because you weren't a boy scout it only takes a bit of practice!

For now I can certainly rule out the 15-30.. As for me its far too expensive. Better look up the boy scouting classes...lol I was considering the Tamron 17-50 as at first glance its reasonably wide at the wide end and fairly fast throughout. Anyone use this lens at all ?

Though I dont do much landscape work. The point of the filter size on the Irix and Samyang lenses had not gone unnoticed..

Isn't that just an APS-C lens? If you're buying new for full frame why would you get that? The 15-30 is Tamron's offering, albeit modified by Pentax. You could consider the Sigma 12-24 but resolution isn't as good as the prime Samyang or Irix, particularly at the edges. Samyang also do a 12mm although its a fish-eye. That can however be de-fished using Fisheye Hemi, a Photoshop plug-in (works well and with Elements too.)
As to using filters, not going too wide makes things simpler, and a polarizer doesn't always give the right effect with very wide lenses as they darken skies mostly at 90 deg to the sun so can lead to an uneven darkening. (ND grads not affected by that.)
Re Scout estimation. one had to estimate three heights and three widths and be within 10%.

I was considering the Tamron 17-50 ,,,Sorry is that an apsc lens ...I thought all Tamron lenses were full frame compatible... Im being to lose the plot..If at all I ever had it...

What about one of the older film-era Cosina/Vivitar 19-35s which you can pick up (I think) for about £100 or so? I used mine on my old MZ-5N and it was reasonably good (still not that small, nevertheless) and I still have it in the cupboard.

That Pentax 18-35 would still be your best buy for now. Not perfect but it is a Pentax and cost is peanuts. You could use it on a KP too!
https://www.pentaxforums.com/lensreviews/SMC-Pentax-FAJ-18-35mm-F4-5.6-Zoom-Lens...

Don't rush to get rid of you 10-20. You might find thats ok from about 15 or 16mm

Hello Stub

I have an FAJ 18-35 in excellent condition which I would be willing to pass on to a new home.

If you are interested send me a pm, I am sure we could work out a reasonable price.

Dave