Is this Anamorphic?

I need your help! I recently purchased just the front element to a Panasonic AG-LA 7200 Anamorphic lens adapter. What kind of lens do I need behind it in order to make it work with my camera lens, I found something about a collimating lens as the rear element, but not sure. Also, is it even possible to make my own Anamorphic lens with this element? Ive seen a few videos of people cutting off the front element and building a slide system to assist with focus issues, but they still had the rear part of the lens housing attached to the camera lens, Im thinking if I can find a compatible rear element then I can 3D print a housing and hopefully have an Anamorphic lens on the cheap, just don't know enough about the rear lens issue, any help is greatly appreciated.
 
Having wrestled recently with a director wanting to shoot Alexa with anamorphics, and not being able to use a 4:3 Alexa for this purpose since we already have the 16:9 version, I did all the math and reported back that it would require a 150% blowup to deliver a 2:39 image. Recording to HD 1080, this would result in images that were likely to be unacceptably soft (my experience is that you can blow up to around 120% without a lot of degradation, but thereafter it becomes noticeable). If we were to record to 2K, we'd gain a whopping 6% of resolution, no big whoop. If we jumped up to Arriraw at 2.8K, the crop would take us right back to full 1080, our delivery format. Unfortunately, between the rental of the anamorphics and the raw recorder, it was too rich for our budget but it was good to at least work the numbers.
 
CharlesPapert said:
Having wrestled recently with a director wanting to shoot Alexa with anamorphics, and not being able to use a 4:3 Alexa for this purpose since we already have the 16:9 version, I did all the math and reported back that it would require a 150% blowup to deliver a 2:39 image. Recording to HD 1080, this would result in images that were likely to be unacceptably soft (my experience is that you can blow up to around 120% without a lot of degradation, but thereafter it becomes noticeable). If we were to record to 2K, we'd gain a whopping 6% of resolution, no big whoop. If we jumped up to Arriraw at 2.8K, the crop would take us right back to full 1080, our delivery format. Unfortunately, between the rental of the anamorphics and the raw recorder, it was too rich for our budget but it was good to at least work the numbers.
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Thing is, your res loss wouldn't really be that. Keep in mind that you would blow the footage up horizontally, resulting in a horizontal res at 3840 (because of the 2X factor) thereby giving you a 3840x1080 resolution. Then you would just crop away the sides, ending with a picture that is 2581x1080. No need to zoom. If you were to zoom it would be in a 1080P timeline, where you would have a sequence that is 1920X539 and zooming 149% would yield you a sequence with 1920X804, the same resolution you would get if cropping from 1920x1080 material to get 2.39:1. So no res loss there!
 
Gabriel, anamorphic delivers more information vertically but not horizontally. Your original image will always only have 1920 lines edge to edge. However you look at it, as blowing it up or cropping it, in an HD timeline you will end up with 1280 as your horizontal resolution when the footage is restored to a 2:39 aspect ratio (reminder to all, this is assuming 1:78 camera original). The vertical resolution suffers no loss.
 
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