Originally posted by hatsofe Modern Pentax optics (and other accessories) for wildlife photography are nearly non-existent. The 150-450mm is very good, but 450mm doesn't provide enough rich in 60% of the cases that I've been using it in last 3 years ,since I bought it. I tried to couple it with the modern 1.4x Pentax teleconverter ( after reading an article in Pentax forums that claimed that such a combination can provide good results , if the zoom was within the range 150-400mm). I was very disappointed; the converter considerably reduced the resolution pretty much across the entire zoom range, and increased the chromatic aberration and glare around bright objects. Until recently,there was another telephoto option from a house of Pentax : 560mm. It looks like that it was quite overpriced for the quality it could provide (I found some reviews but never tried it by myself) but in any case it , apparently was discontinued about two months ago. I noticed that some pentaxians who were interested in wildlife used Pentax DA 300/4 combined with 1.4x modern converter. I see it as really a forced solution , that somehow filled the void in Pentax optics. The image quality of the pictures were not impressive at all, and the lens reach is very "modest'. As someone who shoots wildlife almost exclusively , I need good optics in 400-600mm range , and a professional quality 1.5x teleconverter. It doesn't seem coming any time soon , or maybe at all.
I'm not seeing any images.
So I'm not willing to comment as to how good or bad your images might be, or why they might be that way.
But, look at the images in this thread...
300mm plus Lens Club: discuss your long lenses - Page 1941 - PentaxForums.com
I guess that's not good enough for you?
The serious guys seem to be able to track down older long glass.
I personally tracked down a Tamron 300 2.8 which I use with the F 1.7x AF adapter to give me 510mm or on my K-3, 750 equivalent, or with the Tarmon 2x to give me 600mm for my K-1,but many of these are taken with shorter lenses.
https://www.flickr.com/photos/149541448@N08/albums/72157683751426530
But I have many images taken with the DA*60-250 and 1.4 TC, or even the DA*200.
For wildlife, I tend to use even shorter lenses.
https://www.flickr.com/photos/149541448@N08/albums/72157685900262555
Your complaints aren't resonating.
Wildlife is more about skill in stalking and perserverence getting to good shooting locations than it is about lenses. If you hear about good shooting location, you go. That's the key. Sometimes they don't last for more than few hours.
This image taken with my DA*60-250 at 88mm.
Taken with a DA*60-250 at 250mm
A lot of people seem to be under the impression all you need is a long lens. Where I live there are not open spaces that are conducive to longer lenses. I'm guessing a high percentage of my images were taken at less than 500mm.