150-450mm focus adjust

At 450mm. Note the lack of fur detail

I suspect there may be a lens issue
UK Wildlife blog ----- UK Wildlife Facebook page ----- UK wildlife Twitter
Equally, a number say it's very sharp wide open at the long end, so lens variation, technique, who knows?
It's a rare lens that performs really well wide open. Most lenses have their sweet spot a couple of stops down.
Your lens tests look in focus but soft. If you can, maybe try another copy of the lens, or the lens on another body?
I found shots taken at around 400mm seemed much clearer & sharper than at 450mm (see my thread 300mm v 150-450mm).
I sent some sample images to SRS and waiting to see what they think.
Try something with fine detail such as beer bottles.
Roof tiles although at a longer distance than wildlife are good for checking focus and sharpness.
450mm should not be soft.
You could change it for the excellent Sigma 150-500mm F5-6.3 APO DG OS HSM which is superb at 500mm f/8 1/320th on a tripod. SR works and is often needed on a tripod at this length.
K-5 100% Crop from JPG just a touch of sharpening
500mm f/8 1/320th : 400ISO

--
Half Man... Half Pentax ... Half Cucumber
Pentax K-1 + K-5 and some other stuff
Algi
However, I would add that it's worth repeating your test several times, as I have found with my lenses that I often get variances on the same lens at the same focal length on the same target! If you get this all you can do is take the best average.
Regards
David
PS I disagree with Algi, I don't see a problem with the subject you are using to test this.
Flickr
Nicola's Apartments, Kassiopi, Corfu
Some cameras, some lenses, some bits 'n' bobs
Look for the auto focus adjustment chart on the right hand side and download it. I use on all my cameras to date and it works well....

https://www.flickr.com/photos/k_paxian/albums/72157670182307936 https://www.flickr.com/photos/k_paxian/albums/72157666036189960 https://www.flickr.com/photos/k_paxian/albums/72157664155442133

My Flickr link
"Life is what happens to you while you're busy making other plans" (John Lennon)
got on?
UK Wildlife blog ----- UK Wildlife Facebook page ----- UK wildlife Twitter
Ive been waiting for a weekdn when I can actually get to watford. Not contacted SRS yet, not sure how gwb67
got on?
Thanks Neil for the update Iam sure what to do with my lens yet either.
NeilP
Member
Im not 100% sure but it looks like its focusing OK perhaps slightly front focusing?
Question is, is this enough to account for the loss of sharpness shown in the thread below or is this lens faulty?
https://www.pentaxuser.com/forum/topic/is-the-150-450mm-sharp-at-450mm-wide-open...
UK Wildlife blog ----- UK Wildlife Facebook page ----- UK wildlife Twitter