everyone knows my preference... look in my signature... they are so good i bought two of them....
35mm Adapters: Construction; Function; Pros/Cons
- Thread starter TimurCivan
- Start date
Lenilenapi
Carbonite Member
Tim,
Have you actually put these various adapters side by side to compare how fast they are as well as relative sharpness, DOF characteristics, and bokeh qualities? I'm thinking especially of the recent Brevis versions vs. the SG Pro.
I'm asking because you've clearly stated your preference for the SGPro and I'm wondering how much direct comparison might have been involved in that.
I really like what you've done with this forum by the way. It's filled a big hole inon DVXUser and your explanation of the various mechanisms is great.
I understand also that you don't probably don't want to be perceived as hawking one manufacturer over another.
My concern is that I have seen alot of claims made for one adapter or another only to find that the person making the claims had not carefully compared them. As the units themselves are often updated and improved it may be hard to do as well.
- Lenny Levy
Have you actually put these various adapters side by side to compare how fast they are as well as relative sharpness, DOF characteristics, and bokeh qualities? I'm thinking especially of the recent Brevis versions vs. the SG Pro.
I'm asking because you've clearly stated your preference for the SGPro and I'm wondering how much direct comparison might have been involved in that.
I really like what you've done with this forum by the way. It's filled a big hole inon DVXUser and your explanation of the various mechanisms is great.
I understand also that you don't probably don't want to be perceived as hawking one manufacturer over another.
My concern is that I have seen alot of claims made for one adapter or another only to find that the person making the claims had not carefully compared them. As the units themselves are often updated and improved it may be hard to do as well.
- Lenny Levy
I kinda prefer to stay out of the argument for now. i am working on a 35 adapter guide, Video/PDF dwnload package that will hopefully help answer there questions.
the camera remains locked on the GG, the 35mm lens does all the focusing now.
indieGuerilla
Member
Can someone direct me to the best info on this site or elsewhere about reducers condensers, achromats and how to choose. Maybe there is some formula or some chart out there that can help me understand better how they play a part in the whole 35mm adapter game. IG
Wayne Kinney
DVXUser Sponsor
You need an SLR zoom lens on the front end.
Winston Vargas
Well-known member
Why bother.. why don't you just use a medium format adapter. using a groundglass that's 2 1/4 x 1 5/8 like my adapter.
www.freewebs.com/wvargas
www.freewebs.com/wvargas
Winston Vargas
Well-known member
Spacer rings will not work properly because the camera should be at the widest or close to the widest focal length on the camera zoom lens in order to have the macro focusing ability, otherwise as you zoom in you loose the macro capability of the lens.
RandomHero
Well-known member
This was amazing. Thank you so much for the lesson
GRENCH
Well-known member
static adapter?
static adapter?
Has there been any progress in the deveopement of grainless ground glass?
Also what in your opinion is the best achromat and closest thing to a grainless ground glass available. I want to build my own 35mm static adapter for my own purposes. Trying for the sharpest image possible. Concerned with light lose, but as long as I don't loose more then 1.5 to 2 stops I'll be fine. I will be using it mostly for outdoor daytime shoots.
Thanks
Grench
static adapter?
Has there been any progress in the deveopement of grainless ground glass?
Also what in your opinion is the best achromat and closest thing to a grainless ground glass available. I want to build my own 35mm static adapter for my own purposes. Trying for the sharpest image possible. Concerned with light lose, but as long as I don't loose more then 1.5 to 2 stops I'll be fine. I will be using it mostly for outdoor daytime shoots.
Thanks
Grench
JohnLeeFilms
Active member
Check out Jonathan's adapter the G35 at www.cinemek.com it is a very nice adapter. Yes it looses 1.5 and that's not bad for the amount of "real" diffusion you get. I have to say that I am sorely dissappointed in the Brevis the more footage I see. I am glad I never bought one. Some of the footage from the bright screens used has no shallow DOF whatsoever. I just watched a test footage of the Brevis that had less shallow DOF than my bare camera:
http://vimeo.com/1856537
I think the mark is being missed as to the actual reason why 35mm adpaters were even invented. Look and study the bokeh in actual film, then go check out the G35. It's an exact match.
MitchLewis
Well-known member
Nebie question: Where do you adjust the aperture? (light level to the sensor) On the 35mm lens or using the video camera's controls?
I'm asking because I need to know if I can get away with buying Canon EOS lenses so they would serve double duty on our still camera as well as the video camera.
Thanks in advance!
I'm asking because I need to know if I can get away with buying Canon EOS lenses so they would serve double duty on our still camera as well as the video camera.
Thanks in advance!
JohnLeeFilms
Active member
Mitch,
With the EOS lenses you can't control it's aperture so it will be wide open all the time. if that's fine with you then yes you can use them, Just adjust the camcorder's manual aperture or use the ND filters if there is too much light. I used the EOS for about 6 months without much trouble.
With the EOS lenses you can't control it's aperture so it will be wide open all the time. if that's fine with you then yes you can use them, Just adjust the camcorder's manual aperture or use the ND filters if there is too much light. I used the EOS for about 6 months without much trouble.
MitchLewis
Well-known member
Thanks John. I'm going to splurge and go with Nikon lenses.
Winston Vargas
Well-known member
The adapters have nothing to do with the amount of DOF. The DOF is created by the lens and the lens only. You can take all the adapters with the same focal length lens on each and all set to the same aperture and the DOF will be the same in all of them. All you're doing is photographing the image created by the lens, and all the lenses will create the same image. When you buy a camera and you mount a particular lens on it and use the same lens on another camera does the DOF change? The answer is no. That's like saying that 2+2 equals 4 but on Mondays it equals 5,
DOF is created by the focal length of the lens and the aperture selected, nothing more. the groundglass is displaying the image created by the lens and the video camera is photographing the groundglass. I've been asked which 50mm lens will give you better DOF a Nikon 50mm 1.4 or a Canon 50mm 1.4. Used at the same aperture at the same distance they will give you the same DOF. 50mm is 50mm and no one can change that!
DOF is created by the focal length of the lens and the aperture selected, nothing more. the groundglass is displaying the image created by the lens and the video camera is photographing the groundglass. I've been asked which 50mm lens will give you better DOF a Nikon 50mm 1.4 or a Canon 50mm 1.4. Used at the same aperture at the same distance they will give you the same DOF. 50mm is 50mm and no one can change that!
JohnLeeFilms
Active member
In theory, you are correct...and it is true that no matter which 50mm f1.8 lens you use, you will get the same DOF. But in practice, you can take the same lens and same camcorder, switch out the adapter, and, depending on how the gg is made, you can get "thinner" or "thicker" bokeh which to the eye would appear as more or less of a blur factor in the DOF.