
Vignetting and the Letus Extreme - Instructional HD Video
3 months ago
I decided that I would share whatever knowledge I have in my brief time with my EX1 and Letus Extreme 35 mm lens adapter by doing a video blog. I am not an expert, but I have logged some serious hours on both of them.
I created my website initially to get my name out to potential clients and sell my television skills as a freelancer. I have found jobs because of this website, but I have also discovered that there is a huge community of people who are interested in producing quality television. Most of them have commented on my videos and sent me comments through my chat room, forum, vimeo and email.
Many people have emailed me and asked me several questions regarding my homemade dolly system, my modified telescope panning time lapsing, features on the ex1, color grading using Magic Bullet and shooting with the Letus Extreme.
I have found it very difficult to email answers to these questions. The best way to help people understand is to show them.
This is what I am planning to do with Video Blog entries. This is my first. I will try to do more as I get some time off this summer.
I have shot this video in the “Surviorman” technique with multiple cameras alone in the wild (where I like to shoot). I decided to answer the vignette question that many people have asked me. I own cheap lenses, so some of my vignetting could be inside the film lens and not in the Letus. This “webisode” details using the EX1’s zoom lens to push past the Letus innards and remove the black on the sides of the frame. It is important that the ground glass window is close to center in the frame as you push through it. You will see that it is not and I need to calibrate it. I did not talk about or fix any of this in the video.
I am currently having trouble with edge sharpness on the Letus. This is because I adjusted the Letus ground glass back-focus and by doing so, the ground glass plate is not perfectly straight anymore. I will try to fix this (or I may have to send it back to Letus).
One thing to look at here is the fact that the EX1 blows the Sony Z1U and the Sony HC3 HDV cameras away in color and general imagery. When I was cutting this together, I could not believe how bad the Z1U looks against the new Sony CMOS chips in the EX1.
I tried to be as clear as possible, but if you have any questions, please use my forum. For more information on the Letus Extreme (or to purchase one) please check out letusdirect.com.
My webpage is located at tomguilmette.com
I created my website initially to get my name out to potential clients and sell my television skills as a freelancer. I have found jobs because of this website, but I have also discovered that there is a huge community of people who are interested in producing quality television. Most of them have commented on my videos and sent me comments through my chat room, forum, vimeo and email.
Many people have emailed me and asked me several questions regarding my homemade dolly system, my modified telescope panning time lapsing, features on the ex1, color grading using Magic Bullet and shooting with the Letus Extreme.
I have found it very difficult to email answers to these questions. The best way to help people understand is to show them.
This is what I am planning to do with Video Blog entries. This is my first. I will try to do more as I get some time off this summer.
I have shot this video in the “Surviorman” technique with multiple cameras alone in the wild (where I like to shoot). I decided to answer the vignette question that many people have asked me. I own cheap lenses, so some of my vignetting could be inside the film lens and not in the Letus. This “webisode” details using the EX1’s zoom lens to push past the Letus innards and remove the black on the sides of the frame. It is important that the ground glass window is close to center in the frame as you push through it. You will see that it is not and I need to calibrate it. I did not talk about or fix any of this in the video.
I am currently having trouble with edge sharpness on the Letus. This is because I adjusted the Letus ground glass back-focus and by doing so, the ground glass plate is not perfectly straight anymore. I will try to fix this (or I may have to send it back to Letus).
One thing to look at here is the fact that the EX1 blows the Sony Z1U and the Sony HC3 HDV cameras away in color and general imagery. When I was cutting this together, I could not believe how bad the Z1U looks against the new Sony CMOS chips in the EX1.
I tried to be as clear as possible, but if you have any questions, please use my forum. For more information on the Letus Extreme (or to purchase one) please check out letusdirect.com.
My webpage is located at tomguilmette.com
This conversation is missing your voice. Take five seconds to join Vimeo or log in.
There is 1 more comment in
1 group +
- Vimeo: About / Blog / Roadmap / Developers / Forums / Help! / Site Map
- Legal: © 2008 Connected Ventures, LLC. All rights reserved. / Terms & Conditions / Privacy Statement



.
2,250
43
34
0
0
Previous Week
Having to carry around the extra weight and mounting and unmounting the Letus seems a hassle and keeping it on obstructs using it as a handheld.
link: tomguilmette.com/Site/Blog/Blog.html
click the top entry.
I use a lot of run and gun shots (filming live events) so not removing it would be impossible because the Letus makes the hard to handle handheld. Having a 35MM adapter would not be an option for me in that case. Too bad :(
Keep up the great work Tom.
- Ray
The reason I posted this is because I wish someone else explained "zooming through the Letus and the film lens" before I bought my Letus. I did not understand how this worked and could not wrap my brain around the idea of using the camera zoom to push through a prime lens.
I also address the vignette problem with this device.
I hope this helps you.
I just want to know how can you focus on the GG holder, what is the best way?
And my second question is how can you zoom in in the 35mm adapter without effecting the focus!
Thanks again Tom :)
as far as zooming through the lens, it just works. i am amazed at how this contraption works. remember, i just point the camera and take the pictures. i am not an engineer.
thanks for clarifying this.
since i am now using the letus extreme on the ex1, i need to buy the achromat replacement (which is in the ex1 kit you spoke of) and place it between the letus and the ex1. is this correct? will this fix the edge to edge sharpness problem?
Surely Philip will know :)
from the letus website:
This optimization kit includes a custom achromat lens and a 77mm thread ring specifically designed for the Sony PMW-EX1 XDCAM . This corrects the issues in the Sony EX1 lens and gives you sharp focus across the entire image. This kit is as add-on for the Letus35 Extreme. You must have an Extreme with a removable rear achromat lens for this kit to work. This is a direct replacement for the stock achromat and includes an optimized thread ring specific to the EX1 as well.
i do not have the kit, but i found it on letus35.com for $350. do i get a discount since i am already a letus extreme customer? did you pay full price for this kit? i emailed and called letus earlier this week and i have not heard back from them.
You are such a great help for us!
-Steve
What do you mean by 'blows it away'. Is there a way to describe this?
Maybe with a side to side comparaison, with and without the letus, now you are in your videoteachingmood.
I am realy intrigued by your statement, and I understand the quality difference between the 2 chips. For now I don't have the money to upgrade.
But maybe there is a way in post to do something for the Z1 images? Can you help?
I've got a much smaller camera (a Canon HV30) and I have been rather worried that there was no way around the vignetting from the lens and adapter. This clears up a lot!
As always, love your work. Keep it up, I'll definitely be watching!
thanks in advance Tom.
please make more videos like that, Tom :]
awesome to see some Pro stuff in action! :]
Are you really getting the focal length of the attached lenses?
How about letting the vignetting there just for the extra field of view and adjusting the brightness difference in post?
Or maybe it's not possible, because the loss of sharpness is too big as well?