Originally posted by RonHendriks1966 Yes it would.......but
A TC does affect image quality. So the K-1 (ii) with TC and 150-450 mm becomes 210-630mm/f6.3-f7.8 at reduced image quality. Put it on a K-3ii and it is comparable longer at 230-690mm/f4.5-f5.6 with comparable depth of field. And no penalty on image quality for that sensor (or replacement camera for that).
So I have no idea wich wins. My guess is that the combo with the K-1 (ii) is better, but if that is worth the investment......I don't know.
The TC does not reduce image quality on the subject, only over the whole frame. It may infact increase the lw/ph devoted tot eh subject of the photo by 37%. Pentax says the overall loss of quality is about 3% on the hD DA 1.4. The odds of you ever taking a picture where that loss of quality is noticeable is pretty small.
By itself, the statement a TC reduces image quality only refers to over the whole unreduced frame. It doesn't refer to the subject of the photo in my bird images. IN those the TC vastly increases IQ.
Not using a TC just spreads limited lw/ph over a much wider area. If you get 3000 lw/ph in a sensor without the TC, you get 2910 with the TC crammed into 1/3 less field of view. You can lose more resolution stopping down from ƒ5.6 to ƒ8 on some lenses and most of us do that without thinking.
If you have 2000 line pairs on your subject without the TC you could have as much as 2740 on your subject with it. That's a heck of bump.
The Blue Jay knows I'm right.