What stop were you at when you were using it.. to see no effect.. its usually pretty noticeable wide open.. well on zooms that ramp at the end.. I guess its cheaper to make with a gradual ramp through out the whole range.. ?.. but surely you would see something..
FS7: Angenieux EZ 30-90 T2 vs Zeiss 21-100 T2.9-3.9
- Thread starter TMHiggins
- Start date
What stop were you at when you were using it.. to see no effect.. its usually pretty noticeable wide open.. well on zooms that ramp at the end.. I guess its cheaper to make with a gradual ramp through out the whole range.. ?.. but surely you would see something..
I do on mine.. at wide open in low light .. ENG zoom was the same.. over 2.8 there isnt any .. yes I guess that its over the whole range disguises it more.. but your paying by not having max aperture till right at the end..
Maybe your zoom doesn't ramp much anyway.. whats the range.. size of the elements
Maybe your zoom doesn't ramp much anyway.. whats the range.. size of the elements
Ben Scott
Veteran
t2.9 to 3.9 is less than a stop. t2.8-t4 would be a stop.
S.Blanchardon
Well-known member
Wide open and I could not notice the ramp... Seriously, it was made very linear by Zeiss and it is unnoticeable to the naked eye. Of course on a scope you will probably see it.
Ok thanks .. interesting.. I wonder how they do that ... that you dont even see it wide open.. on a rapid zoom in..
Nirv
Carbonite Member
Clearly you would notice. The greater the rate of change of focal length the more noticeable it would be. A slow creep in over a short focal range then probably not but a crash zoom it would be very obvious.
If the light loss is 'linear' across the focal range change it would make key framing an exposure correction in post very easy.
Lenilenapi
Carbonite Member
This seems like an odd conversation. If the lens ramps from 2.9-3.9 then its losing nearly a stop whether you happen to notice during a zoom or not and I don't get how you couldn't. Most of us aren't live zooming regardless. The main point to me is if I am shooting at 2.8 or 2.9 and zoom in for a close shot then I'll be underexposed and that bothers me a lot.
If the lens stops ramping once you get to f4 then fine - I would just consider it an f4 lens and have a little bonus in my pocket for wide shots, but I would generally always make sure I was planning on shooting no more open than f4.
If it continues to ramp even at higher f stops then it would be unacceptable to me.
All of these zoom lenses have trade offs, so we all have to pick our poison. Price is certainly one, resolution and IQ is another, par focal quality a big curse in the DSLR lenses, IS, fly by wire focusing etc. Sony has chosen the odd route of coming up with engineering solutions to many of these problems. If they ever manage to get it right they will have pulled off a miracle and I'm skeptically rooting for them. Maybe its impossible but I want to see how well they do with the 18-110 before I make any assumptions.
If the lens stops ramping once you get to f4 then fine - I would just consider it an f4 lens and have a little bonus in my pocket for wide shots, but I would generally always make sure I was planning on shooting no more open than f4.
If it continues to ramp even at higher f stops then it would be unacceptable to me.
All of these zoom lenses have trade offs, so we all have to pick our poison. Price is certainly one, resolution and IQ is another, par focal quality a big curse in the DSLR lenses, IS, fly by wire focusing etc. Sony has chosen the odd route of coming up with engineering solutions to many of these problems. If they ever manage to get it right they will have pulled off a miracle and I'm skeptically rooting for them. Maybe its impossible but I want to see how well they do with the 18-110 before I make any assumptions.
icarusfilm
Veteran
For me as long as the ramp is not noticeable between 21-35 and then between 50-100 the ramp would be insignificant in real world shooting
Yes and so my surprise to read that there wasn't any
.. Leni.. I wouldn't worry too much about the ramp at the long end of a lens.. provided the actual zoom is not used.. its way better to have the ability to actually get the shot.. and then its a very easy correction in post.. I used the Cab 19-90 alot .. then the CN7 which ramps over 90.. by coincidence ?.. but having the extra range on the CN7 and so being able to get in tighter..which the 90 just never seemed enough.. was a big bonus .. there have never been any midnight phone calls from post about shots 2/3,s a stop under .. but there might have been had not got the shot..Lenilenapi
Carbonite Member
I realize that Donny. Its not a deal killer, but it is limitation t be weighed against any others. depends how soon it ramps in etc. I've used less that ramped for many years. But I'm not fond of it.
I dont think anyone is.. but a decent range and you will always have it in a cine lens.. alot of people were up in arms over the CN7 ramp.. obviously 90mm with a 114mm front element seems to be the limit,within cost considerations I guess,.. Canon added another 30mm with a ramp.. and I think it was a clever move.. and Im sure they have sold more than the Cab by now..