Its worth mentioning they can be dangerous places, I visited a site nr Walsall earlier this year, disturbed a half asleep pidgeon which dislodged 3 bricks mortared together on takeoff that landed a foot from where I was standing.

I'm hooked on urbex shoots, but I tend to add a lass with little or nothing on in mine LOL

+1

The K5 is a well capable camera, if its just the WR then if it was me depending on the other lenses you own, look to add one that stretches you in some way, or takes you in a different direction, macro maybe ?

WR is only weather resistant, not water proof, how many times a year do you and your camera get wet ?

Your correct the PLM version is compatible from the K3 onwards, apart from the WR, whats yor existing lens not doing for you ?

As far as I'm aware, yes they do, you just need to give them your PU membership number.

The K1 is well capable of capturing detail, the below is a 215% crop from pretty much the original shot last Friday ( cropped section highlighted )

K1 - 100 ISO - F2.8 - 1/1600 sec Handheld - DFA* 70 - 200 @ 200mm

When sat in a hide or very still, the mono + gimbal takes the weight of the combo, I have no issues with handholding the 150 - 450 with either a K1 or K3iii over many hours.

Handholding offers advantages such as flexibility in movements which you don't get with a tripod / monopod, but increasing the iso can compenste.

I successfully use a K1 or a K3iii with a 150 - 450 on a monopod plus a cheapish gimbal, so would highly recommend the combo.

The Pentax SMC FA 645 80-160mm F4.5 Lens is a medium telephoto 2X zoom that enables you to frame any landscape just as you like. This lens uses extra-low dispersion (ED) glass and extraordinary-low dispersion glass in the optical system to effectively correct the various types of aberrations, and a ghostless coating is used for effectively preventing reflections on the lens inner surface. This enables a sharp image with high contrast.

645 80 - 160 Lens - Excellent++ Boxed £575 - Pentax dealers have been OOS for over 12 months and current price is £1999 - Bank Transfer preferred

Pentax FA 645 60-160mm F4.5 Lens Specifications:

Maximum aperture: F4.5.
Minimum aperture: F32.
Angle of view: 38° to 19.5°.
Lens construction: 11 elements in 10 groups.
Minimum focus distance: 100cm.
Weight: 1010g.
Dimensions: 85mm x 130.5mm.
Filter size: 77mm.

Included accessories:

Boxed with original Front Cap & Rear Cap, Lens Hood PH-RBF77, unused Soft Case S110-160.

The Pentax FA 645 150mm F2.8 features a large aperture of F2.8 for enabling a natural out-of-focus (bokeh) effect for backgrounds and representations with a three-dimensional feel. This provides delineation performance for landscape photos and portraits.
High-refraction low-dispersion glass, extraordinary-low dispersion glass, and other components are used to minimize colour blurring and allow sharp imaging performance with high contrast and high resolution. An inner focus system is used for keeping stable, superior imaging performance from the infinity end to the minimum shooting distance, and closeup shooting up to a minimum of 1.2m is possible.

A large hood with a PL filter operation window is included for enabling accurate operation of a circular polarizing filter while checking the results through the viewfinder.

645 150 F2.8 Lens - Excellent++ Boxed - £695 ( Pentax Dealers have been OOS for over 12 months and the current price is £1175 ) Bank Transfer preferred

Pentax FA 645 150mm F2.8 Lens Specifications:

Maximum aperture: F2.8.
Minimum aperture: F22.
Angle of view: 26°.
Lens construction: 7 elements in 7 groups.
Minimum focus distance: 120cm.
Weight: 500g.
Dimensions:96mm x 74.5mm.
Filter size: 67mm.

Included accessories:

Original Box, Original Front Cap & Rear Cap, unused Soft Bag S120-150, Lens Hood PH-RBF 67mm

Some slight use marks on the hood