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VisualKnight

bought new 1.3x lens. Not sure what brand it is

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[img]http://www.eoshd.com/comments/uploads/inline/20577/5004358d76523_235vs240.jpg[/img]

Ok, I recently purchased a lens on ebay that says that its 1.3x, which means a 30 percent squeeze or 2.40??:1 / 1920x756 really not sure what aspect ratio it is. Which is on the Right of the image Im Sharing. On the left I only did a 25 percent squeeze or 2.35:1 / 1920x810 aspect ratio. Now the ebayer that sold me this lens told me it was 1.3x. But I'm really not sure. The lens looks like a Century Optics Lens.But its not as blurry some of the videos that I've seen on ebay. I'm using a T2i and Helios 44-2 lens with a 49mm to 52mm thread which FITS THE ANAMORPHIC LENS. The lens is beautiful- it's a little dusty- and it has an anamorphic rubber band around it. No brand is on the actual lens and underneith it it says Made In Japan. 2 Questions come to mind- What is what is the proper aspect resolution/squeeze based on the photo I've taken? What is the brand of this lens?

Here is a photo of the actual lens.
[img]http://www.eoshd.com/comments/uploads/inline/20577/50043c05b7c6e_anamorphiclens.jpg[/img]

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EOSHD Pro Color for Sony cameras EOSHD Pro LOG for Sony CamerasEOSHD C-LOG and Film Profiles for All Canon DSLRs
Free advertising for Ray Valenti! Of course, I'll never be able to afford a house after buying all of these anamorphic lenses.

There are a couple of generic/off-brand models out there. I have no idea of what this one is. But it's good to hear that you seem to have found a winner.

To answer your question about aspect ratio, try this: Print a picture of a circle and tape it a wall. Square up your camera as much as possible and get a quick shot of the circle. Then take it into your editing software and stretch it out until it's a perfect circle again. Look at how much you had to stretch it and you'll know the ideal ratio of your lens.

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it is a 1.33x squeeze. original model of this was designed for 4:3 to 16:9 conversion. on a 16:9 sensor you'll get around 2.35:1. just use the modify footage to 1.33 anamorphic on your software.

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[quote name='QuickHitRecord' timestamp='1342456705' post='13974']
Free advertising for Ray Valenti! Of course, I'll never be able to afford a house after buying all of these anamorphic lenses.

There are a couple of generic/off-brand models out there. I have no idea of what this one is. But it's good to hear that you seem to have found a winner.

To answer your question about aspect ratio, try this: Print a picture of a circle and tape it a wall. Square up your camera as much as possible and get a quick shot of the circle. Then take it into your editing software and stretch it out until it's a perfect circle again. Look at how much you had to stretch it and you'll know the ideal ratio of your lens.
[/quote]

So- I'll do this with a grid on the circle so I can see if I can rotate it 90 degrees and see if the gride matches. Good idea. No- my aparment building is for sale. I'm new to DSLR video - I'm starting out with a T2i. I dont even have magic lantern on my camera yet.

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Agree it is likely to be 1.33x squeeze. Visually very similar a 16:9 adapter from the 4:3 digital video era.

Post some footage would love to see it!

How wide can you go without vignetting?

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[img]http://www.eoshd.com/comments/uploads/inline/20577/5004eddfcc492_checked.jpg[/img]

Aparently its 2.222:1 when converting 16:9 content. I did exactly what Quick Hit Record suggeted. I took a photo of one of the lens thread adapters then started doing different squeezes and 100%x80%. If Im doing the math correctly this lens would make 720x480 4:3 to 720x384. which is either a 1.88 or 1.85:1. Lucky I checked when I got home from work. I still like this lens. I will however still need a diopter and there are no front threads. Since the lens arrived today I brought it to work to test out. I didnt record any footage- just took photos. I dont have a full frame camera. Just a T2i, photos have no vignetting at all! I will have to correct myself - I will have to find a diopter and find a way of mounting it to the anamorphic lens.
[img]http://www.eoshd.com/comments/uploads/inline/20577/5004f13eb7b91_testshots.jpg[/img]

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I have found that sometimes the aspect ratio changes slightly depending on the where the lens is focusing (close focus vs infinity focus). This causes the lens to "breathe" when you try to rack focus. I am not sure if this is a focusing adapter but it's something to consider.

And either way, it's not the end of the world. Stretch the footage to whatever it needs to be, and then crop it to anything you want.

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Haven't been to the forum in a while.
I used to have an exact anamorphic adapter like this. [url="https://plus.google.com/photos/115531352452573112063/albums/5738666178176187921/5738666486454606978"]https://plus.google.com/photos/115531352452573112063/albums/5738666178176187921/5738666486454606978[/url]
[url="https://plus.google.com/photos/115531352452573112063/albums/5738666178176187921/5738666184145723042"]https://plus.google.com/photos/115531352452573112063/albums/5738666178176187921/5738666184145723042[/url]

This is pretty sweet. Focus thru on the cheap.
Plus it's 1.33x (roughly)
Shot some footage using this on a GH2 and a 20mm f1.7 lumix and put it on vimeo. No vignette even at 20mm.
Nice flares and easy to use.
As usual edges not too nice but if you get lucky you get a sharper anamorphic than a lot of other people seem to get.

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