By analog i mean a lense without auto focus or motors to stabilise the lens.
I bought a couple of good lens which fully open are f4 they make pin sharp images (except my f4 300mm)but as the light fades and i step up the asa(sony NEX5N)the end result is not as good,sharp,as when i remain at 100/200 asa with my f2 or f2.8 lens
Or is it just me and at times my to light weight tripod that the fault?I like saving lots of money buying an f4 lens when the same focal length same make with f2.8 or f2 might cost 150€ more
On the point on "analog" i find the old manual focus lens used on my sony NEX 3 often can be focused and image take while my NEX-5N with its auto focus cant focus or takes to long as with the 30mm NEX macro lens
Sony have a great focus ing aid which is fast but far slower than when the autofoucs dose work
Is f4 a good idea or saving in the wrong place the F4 lens works very well but there seem to be many times a faster lens would be better????So perhaps i should just sell my F4 lens es and buy faster ????I dont know
If i could get equal quality at say 800asa as 100asa then it would be fine im sure the camers very good but it dose seem to give less sharp results at 800asa???