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.
selling my gold ultra star close focus at 5 feet, comes with a helios 44-2, +1,+2,+4 diopter set, nd filter, step up rings, vid atlantic clamp. going for $350 or best offer. http://www.ebay.com/itm/anamorphic-lens-bundle-/261587403668?