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Internal focussing cheap legacy lens ?


Justin Bacle

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Does anyone know a lens that fits the following requirements :

  • Internal focusing (lens length doesn't change when zooming in/out)
  • usable focal length of 40-80 approximately (What interest me is that I can start at 40~42mm -minimum focal length for my setup- and have a bit of zoom range)
  • can be mounted on canon EOS mount (Nikon, Pentax, M42 or canon EOS mount as examples)
  • cheap/affordable (sub $200)

The goal is to have it on my anamorphic rig so that I can have the convenience of a zoom whilst being able to capture great anamorphic footage. Should be an interesting experiment for an cheap anamorphic zoom solution :D

The only zooms I have all have at least one problem :s 

Most of the zooms I have are longer at shorter focal lengths but I'd like the front element to stay put against the anamorphic adapter

Any ideas ? (I may be missing a simpler solution, but I am curious about this solution :) )

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Whats the anamorphic?

Usually zooms and modern lenses dont fit as well as old pancake primes with 2x projection anamorphics.

In my experience (im still a little noob ) focus throw like optex 1.33x works best in the other way. Perfect with panny 12-35mm and no so much with old primes.

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10 hours ago, Grimor said:

Whats the anamorphic?

Usually zooms and modern lenses dont fit as well as old pancake primes with 2x projection anamorphics.

In my experience (im still a little noob ) focus throw like optex 1.33x works best in the other way. Perfect with panny 12-35mm and no so much with old primes.

I use mainly an Isco Ultrastar but I also have a Singer 16D and about to get an elmoscope ;)

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13 hours ago, artiswar said:

Nikon 35-70mm f3.5 Macro works great for me. It zooms internally, so it sitting with the scope on rails work great. I'd have to check Focus, as I use this with a single focus solution.  Shot this with this set up on a RED Dragon. 

 

Yay, already saw this teaser, and it is great :)

Are you able to use the full zoom range of the 35-70 ? I will vignette with my current setup at the wide end of a 35-70. which only lets me a useable range of 45-70... I'm not sure that is going to be worth it :s

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17 hours ago, tweak said:

Nice work man! Is the lens Parfocal?

It is! Even shooting spherical. 

5 hours ago, Justin Bacle said:

Yay, already saw this teaser, and it is great :)

Are you able to use the full zoom range of the 35-70 ? I will vignette with my current setup at the wide end of a 35-70. which only lets me a useable range of 45-70... I'm not sure that is going to be worth it :s

In the zoom test I used the full range. On the teaser, 35 pretty much covered but was too distorted and wide for most of the content. The big stationary wides were 35-40. 

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