By Matthew Marshall
Trying to understand / fix the LA7200 to make it clearer, less CA, sharper and more usable. Building a lens from other lenses to attempt to do this.
In any case, im trying to understand what is causing the issues in general using the LA7200 on DSLR or Blackmagic cinema camera.
Is it because of the sensor cropping then? The LA7200 was designed for a 4:3 sensor crop therefore it will not work correctly on the BMCC, or larger sensors?
Or is it simply a design flaw overall of the LA7200 , poor lens design / poor coating
If it is a crop sensor issue, what is happening on the LA7200 to cause issues because the sensors are larger crop.
Is the back lens element simply too small, where the image is being projected against the taking lens too small therefore when desqueezed you see parts of the image you really should not? i.e. the taking lens and the sensor is capturing too much of the la7200?
By adding a diopter behind it does that then, make it larger i.e. projects less of what is seen from the front of the la7200 to the sensor?
Or is it more complex than this.
I have tried using a diopter behind the LA7200 i think its a Tokina 0.5 Not sure. I mean it says No 0.05 so I dont know at this point. In any case it does not seem to help.
Just trying to understand, thanks anyone that can help.
By Matthew Marshall
I have a question regarding the LA7200, basically in order to focus you would to move the back lens element or front. Would that be correct? Would it be possible to allow focus by adding another lens element behind the flat back lens element. Not sure how the image is presented by the square back of the LA7200.
Im currently in the process of modifying it and frankensteining the lens with old junked vintage lenses to make it one whole lens that does not need a taking lens. Just want to make sure I have the physics right.
Thanks in advance.
By Chin Yew
hi guys, i started a vimeo channel dedicated to my anamorphic test with LA7200 and GH2, speedbooster and CANON FD lens.
Do feel free to take a look and comment.
By Ryan Atimoyoo
First time poster here....So I am diving into all of these diopter possibilities for a thesis film I have to shoot. I recently purchased the BMPC 4K camera, the tokina 11-16mms and the panasonic LA7200 (Mostly based on advice and research from this site given my modest budget)
But I can't seem to find any recent info for diopters. I know of the rare LOMO as per the guide but can't find it. I know of the Cinetatctics hood, but the diopter solution is evading me. Even watching eyepatch's guide doesn't seem to give recent info.
I'm still pretty green when it comes to diopters so any help would be much appreciated- thanks guys!