01-07-2015, 08:54 PM
Quote:@Joju, you will lose approximately one stop of light with a 1.4x teleconverter. f/4 will become f/5.6.
Nikon gives for the TC-17EIII 1.5 f-stops and for the TC-20EIII 2 f-stops. They don't mention a decreasing aperture for the TC-14EIII, so either they "forgot it" or I have to believe my colleague who owns those converters (in version I and II, I believe) and told me that with the 1.4× converter the f-stop remains the same.
Anyway, 40% to me means f/4.8, so I don't think it's a full f-stop. And (my) alternative lens in question is a 150-600/5-6.3.
Which means the new Nikon ends up at f/8 with 2× converter. So, I got a 300/4 and a 600/8 at 755 + 330 grams, roughly 1kg against a 2.9 kg zoom lens which is larger, has M 105 filter (Nikon: M 77) and a ton of settings to adjust. Price difference from Sigma to the Nikon combination: I expect app. 700 $.
No need to decide now - the Nikon will hit the shelves beginning of february, I still have no confirmed delivery date from Sigma representative.