All Forum Comments
Comment by davidrobinson posted on Disappointed with results when using a Pentax 1.4 x convertor on a Pentax 150-450 lens at 26/07/2026 - 09:13
Comment by davidrobinson posted on Disappointed with results when using a Pentax 1.4 x convertor on a Pentax 150-450 lens at 26/07/2026 - 09:05
Any thoughts would be greatly received. Camera a K3ll was set to F8 1/500 sec, ISO set to auto in this case 200 iso, focus priority. RAW image processed in Adobe PSE 2021
Comment by davidrobinson posted on Disappointed with results when using a Pentax 1.4 x convertor on a Pentax 150-450 lens at 25/07/2026 - 23:49
Comment by davidrobinson posted on Another 'Guess the Plant' at 19/05/2026 - 19:01
Comment by davidrobinson posted on Bursting Out... at 06/05/2026 - 12:38
Comment by davidrobinson posted on 'Drive It Day'...April 2026 (Image Heavy and uploaded at 1000pix size) at 27/04/2026 - 23:03
Comment by davidrobinson posted on 'Drive It Day'...April 2026 (Image Heavy and uploaded at 1000pix size) at 27/04/2026 - 23:01
Comment by davidrobinson posted on Why use a proper camera when you can do this with an iPhone at 27/12/2025 - 15:33
Comment by davidrobinson posted on Why use a proper camera when you can do this with an iPhone at 27/12/2025 - 15:31
Just WOW !
Incredible
Comment by davidrobinson posted on Dragonflies in flight at 03/10/2025 - 22:54


I'd rather not use a tc but crop in instead.
Roughly doing the same thing but without the light loss and slight extra weight.
The other thing is 1/500 sec is a tad to slow, based on rough suggestions your shutter speed should be more than your focal length.
So 450mm on a crop camera is 695mm without a tc so you'd need to be 1/800 sec minimum and roughly 1/250 with the tc
I am going to have a test with 1/1000 shutter and let you know how I get on.