Originally posted by UncleVanya Does the 150-450 work well with the 1.7x?
My experience is it's not better than upsampling, and possibly worse. I think it does better on full frame than APS-C. Here's a link to samples I posted in another thread awhile back. Couple thoughts before you click on this link. When I made an earlier post with these, they were criticized by another member for not being any good due to differences in exposure. Well, I have pulled them up in Lightroom to make them match, and when doing so, I felt I was introducing too many changes that were on their own misleading. So, these are out of the camera and upsampled/and or cropped in Fastone with nothing else done. The fact that the photos with the 1.7x AF are underexposed in comparison is just what happened. Same with the color shift. I recall others have had this same experience with the 1.7x, so I would look at these changes as what to expect will happen without post - a bit of underexposure and a warming of the colors. There are also sample photos from the 60-250 in here. This is before I did the baffle mod on it. What you are looking at in these samples is a series where first, the lens on it's own, then upsampled 1.7x using Lanczos2, then a crop from the resampled image to correspond to the area as if the shot had been made with the 1.7x, AF and finally, a shot with the lens and the 1.7x AF in place. When viewing the photos individually, there's a brief description telling you which one you're viewing.
https://www.flickr.com/gp/148580750@N05/1oP044
In many ways, the 1.7x AF holds its own when used with the 60-250, but I feel it just doesn't work as well with the 150-450. The really long distant shot with the 1.7x AF and 150-450 is pretty lousy compared to the lens alone, and I did multiple shots, so it wasn't a one off.