[robski]

My normal telephoto setup is a Canon 300mm f4 IS plus the option to add a Canon 1.4 TC. The raw lens gives very good results and adding the 1.4 TC still gives very acceptable images. For sometime I've had an itch that needed scatching to see how well a 2.0 TC would work. My local photography shop had a Canon x2 instock and I could not resist the temptation anymore. I bought it on condition if it was a flop I could return it. Needless to say I returned it the next day. But I had it long enough to do a quick and dirty test. Shots of a sawn tree stump but alas the wind was starting gust. However I have posted for your amusement.

1) Raw lens
2) 1.4 TC
3) 2.0 TC
4) 1.4 + 2.0 stacked
5) first image upsized in PS by 2.8 to compare against fourth image.