Originally posted by button Point taken. However, a 400mm 5.6 is LIGHT. I recently had the FA* 300mm 4.5/k10d around my neck for about 2 days straight, similar in weight to a 400mm 5.6 combo, and I never once thought about the weight. For shots between, say, 30 minutes after dawn and prior to dusk, I think it would be quite useful. For lower light shooting, though, f5.6 just doesn't cut it- for me, it's just too dim to allow reliably good judgement/composition.
Richard, regarding your FA* 300 + Tamron 1.4x converter test, I did the same one vs. the Canon 400mm 5.6, and, I hate to say it, the Canon destroyed it (however, I really like my FA* 300 with no TC
).
John
the apparently coming higher ISO's may reduce the pressure for high speed glass. I did an indoor shoot at a church christmas program a few days ago available light.
I took my K10 and 3 lenses. the DA* 16-50 SDM, an FA 24 F/2 and the FA 50 f/1.4.
Essentially the fastest best short glass I have.
Lighting was dingy----- the DA* in program mode produced f/2.8 at 1/60th at ISO 800The primes dropped down to an f/2.0
Overall the results were nothing you want even want a doting mother of the sunday school children to see at larger than 5x7 but there were 2 things that surprised me in reviewing the results.
a) I liked the results of the DA* 16-50 better than I did those of the FA 50---Something that I totally did not expect. My explanation is that there was a mob of children on the platform
and the f/2.8 provided enough extra depth of field over what I got from the FA 50 which went to F 2.0 to make the picture seem 'better' as the range of view in the photo exceeded the depth of field.
b) I got materially better photos at ISO 800 than I did at lower ISO's. The problem here
was camera shake. As I lowered the ISO, shutter times became unacceptably low for handheld shots of 15 wiggling girls, and picturequality at iso 250 was noticibly worse than at ISO 800, and at ISO 100 there was major evidence of camera movement far degrading the photo than any 'noise' evident at ISO 800
Taken together, this experience suggests to me that improved high ISO performance is the single path that will produce better results for the casual photographer.