Canon EF Adapter XL
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Guy_Cochran
DVXUser Sponsor
Re: Canon EF Adapter XL
Remember it does turn long lenses into longer lenses, but fish-eyes become normal and then you have a nice smooth traditional focus ring. The higher quality lenses are also tack sharp.
Unless I had an EOS still camera lens collection though, I still would go for the second generation manual lens. Then you still have motorized zoom control. You also get slightly better Depth of Field being able to drop down to F1.4
Guy Cochran
DVcreators.net
Remember it does turn long lenses into longer lenses, but fish-eyes become normal and then you have a nice smooth traditional focus ring. The higher quality lenses are also tack sharp.
Unless I had an EOS still camera lens collection though, I still would go for the second generation manual lens. Then you still have motorized zoom control. You also get slightly better Depth of Field being able to drop down to F1.4
Guy Cochran
DVcreators.net
Guy_Cochran
DVXUser Sponsor
Re: Canon EF Adapter XL
The First generation of the 14x Manual lens was manual zoom only (like a still camera lens).
The Second generation 16x added the zoom servo where you can switch between manual and servo controlled, meaning you can switch to servo and press your zoom button and it works as you would expect it to.
The stock 20X lens is F1.6 at full wide but increases as you zoom in. You loose DOP. It goes to about 3.2 or so at full zoom.
The 14x and 16x Manual lenses do not change Iris at all through-out the entire zoom range.
Check out http://www.dvinfo.net/canonxl2/articles/article04.php
The First generation of the 14x Manual lens was manual zoom only (like a still camera lens).
The Second generation 16x added the zoom servo where you can switch between manual and servo controlled, meaning you can switch to servo and press your zoom button and it works as you would expect it to.
The stock 20X lens is F1.6 at full wide but increases as you zoom in. You loose DOP. It goes to about 3.2 or so at full zoom.
The 14x and 16x Manual lenses do not change Iris at all through-out the entire zoom range.
Check out http://www.dvinfo.net/canonxl2/articles/article04.php
Re: Canon EF Adapter XL
[quote author=Guy_Cochran link=board=XL2;num=1107466893;start=0#4 date=02/04/05 at 17:29:52]
The stock 20X lens is F1.6 at full wide but increases as you zoom in. You loose DOP. It goes to about 3.2 or so at full zoom.[/quote]
Caun't you lock the apperture ?
Frank
[quote author=Guy_Cochran link=board=XL2;num=1107466893;start=0#4 date=02/04/05 at 17:29:52]
The stock 20X lens is F1.6 at full wide but increases as you zoom in. You loose DOP. It goes to about 3.2 or so at full zoom.[/quote]
Caun't you lock the apperture ?
Frank
Re: Canon EF Adapter XL
[quote author=Shaw link=board=XL2;num=1107466893;start=0#8 date=02/05/05 at 14:09:16]You can but it isn't the aperture that is the problem. Lenses are just slower at their telephoto ends. The aperture stays exactly the same.[/quote]
You mean ... it zooms slower ? Or there is less light comming in ?
I think I'm not following. Sorry.
Frank
[quote author=Shaw link=board=XL2;num=1107466893;start=0#8 date=02/05/05 at 14:09:16]You can but it isn't the aperture that is the problem. Lenses are just slower at their telephoto ends. The aperture stays exactly the same.[/quote]
You mean ... it zooms slower ? Or there is less light comming in ?
I think I'm not following. Sorry.
Frank
Barry_Green
Moderator
Re: Canon EF Adapter XL
What is meant is, the lens is incapable of offering 1.6 at its full telephoto end. The widest possible aperture, when fully zoomed in, is something like f/3.6. Now, as you zoom out, wider apertures become available. But if you zoom all the way in, and open the lens to its absolute most wide-open, it'll be about f/3.6.
What is meant is, the lens is incapable of offering 1.6 at its full telephoto end. The widest possible aperture, when fully zoomed in, is something like f/3.6. Now, as you zoom out, wider apertures become available. But if you zoom all the way in, and open the lens to its absolute most wide-open, it'll be about f/3.6.
Bill__Turner
Well-known member
Re: Canon EF Adapter XL
The change in aperature as you go to telephoto with a zoom lens is called "iris ramping" (probably because if you plot aperature vs focal length on a graph it looks like a "ramp") is strickly a function of lens design.
To maintain a constant f - stop (or aperture) thru the entire range means making the lens larger, heavier and more expensive, so the designer makes a compromise that results in the lens being slower at telephoto than it is at wide angle, in order to meet the design goals regarding size, weight and manufacturing cost.
This practice is far less common with motion picture zoom lenses because size, weight and cost are much less a factor in the design and manufacturing process.
Bill Turner
Century Division
Schneider Optics
The change in aperature as you go to telephoto with a zoom lens is called "iris ramping" (probably because if you plot aperature vs focal length on a graph it looks like a "ramp") is strickly a function of lens design.
To maintain a constant f - stop (or aperture) thru the entire range means making the lens larger, heavier and more expensive, so the designer makes a compromise that results in the lens being slower at telephoto than it is at wide angle, in order to meet the design goals regarding size, weight and manufacturing cost.
This practice is far less common with motion picture zoom lenses because size, weight and cost are much less a factor in the design and manufacturing process.
Bill Turner
Century Division
Schneider Optics