Originally posted by *Claire* I do a mixture of photography, mostly nature based (landscape, some animals/birds, astro and macro) but the P950 struggles in low light, sunrise and bluebells was super frustrating as i missed some beautiful potential shots because the camera was struggling.
I will likely keep the P950 for a while while i make friends with my next camera, but is been a great tool not never use auto and use RAW images.
Ok, you are more like the typical Pentax user than I thought
Pentax offers great value but to cover all 4 of your targets (landscape, animals/birds, astro and macro) you will have to invest a bit, regardless of what you end up getting (I would think that with other brands the cost would be much higher).
A K-70 is a good start, with the DA 16-85mm it would give you a general use lens which would also be good for landscapes (there's the cheaper DA 18-135mm as well that has longer reach, but you would have to decide if 18mm (28mm-FF equivalent) is enough for you, since you have 24mm-FF equivalent with the P950.
For animals and birds the DA 55-300mm PLM that was mentioned, would be a very good starter, having the advantage of being able to use much higher ISOs in the K-70 compared to the P950 will really make a difference.
For astro, a not-expensive way to get very good results would be to add a Samyang or Rokionon (same manufacturer) 16mm f2 lens. It's discontinued but still available new at B&H Photo under the Rokinon brand. Plus the Pentax O-GPS1, which in tandem with the camera's IBIS is able to rotate the sensor to follow stars, allowing for longer exposures without star trails. This alone is a very good reason to go with the Pentax system.
Finally, for Macro there's quite a few options, some quite affordable. One lens that never disappoints in terms of results is the D FA 50mm f/2.8 Macro, which is available new but also very reasonably priced in the used market. The D FA 100mm f/2.8 Macro is also highly rated, while some prefer the Tamron 90mm f/2.8 Macro, also a fantastic lens from what I can see (it's on my future list). My macro lens of choice is the DA 35mm f/2.8 Macro Limited, but I realize it's not for everyone as the minimum focusing distance is really close the the subjects when used near its highest magnification.
Let us know what you decide!