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EX3, Prime Lenses and 35mm adaptors

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Joe Murray
EX3, Prime Lenses and 35mm adaptors
on Jul 18, 2008 at 3:16:34 pm

Has anyone had any experience of the Sony EX3 and prime (cine' or stills) lenses.
Do the focal lengths stay the same? On my Canon XL1 35mm still lenses were multiplied by 7x - making it a fairly pointless exercise.
What about adaptors like the Redrock or Letus, is there any point in using one?
Has anyone tested them out>
Thanks.


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Don Greening
Re: EX3, Prime Lenses and 35mm adaptors
on Jul 18, 2008 at 5:00:01 pm

[Joe Murray] "Has anyone tested them out> "

You might want to email Phil Bloom in the U.K. He's done a lot of work using the lens adapters you've mentioned and was also one of the first to do an in-depth review of the EX3. He owns several HD lenses and would be the one to ask for a recommendation.

Phil's an extremely busy guy these days but if he has the time he'll certainly try to answer your questions and he also has a message board on his web site.

http://www.philipbloom.co.uk/Philip_Bloom/Home.html

- Don





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Ron Shook
Re: EX3, Prime Lenses and 35mm adaptors
on Jul 18, 2008 at 5:53:03 pm

Don,

[Don Greening] "You might want to email Phil Bloom in the U.K."

I did ask Philip that exact question about 6 months ago, so I can answer to Joe. With a 35mm adapter like the Letus you will obtain roughly the same field of view as with a 35mm still camera. It might even be a touch wider. So, for instance, if you had a Letus adapter with a 35mm Nikor lens on it, you would see about the same field of view on an EX as you would with the standard lens zoomed to nearly full wide, but with considerably less depth of field.

Ron Shook
Shoulder-High Eye Productions
CreativeCOW Forum Host for Discreet edit*


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Denis O'Keefe
Re: EX3, Prime Lenses and 35mm adaptors
on Jul 18, 2008 at 6:15:11 pm

The EX 1 is essentially the same as the EX 3, except for the removable lens and ergonomic improvements- and is reported to be pretty nice. Because it has the removable lens there are relay lenses being made to connect the Letus to the EX 3, instead of connecting to the attached lens on the EX 1.
Using an adapter to put a 35mm lens onto the camera as you suggest changes the focal length and not much else.
Using the Letus (or another brand) moves the focal plane to a groundglass ( that is vibrating or spinning ), leaving you with the desirable properties of the 35 mm lens - shallow depth of field, sharp focus where you want it, nice out of focus areas where you want that.
If you search on http://www.exposureroom.com for letus and ex 1 you'll see how good it can look.



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steve cahill
Re: EX3, Prime Lenses and 35mm adaptors
on Jul 24, 2008 at 10:27:12 am

My experience with adapters has been with the EX1 to date, the Letus Extreme and now with the Letus Ultimate. Check out the blog
http://web.mac.com/stevecahill/Steve_Cahills_Blog/Blog/Blog.html

Also specifc videos with the new letus Ultimate @
http://exposureroom.com/members/stevecahill.aspx/assets/33d2b44c5fcb4c3ebca...

&

http://exposureroom.com/members/stevecahill.aspx/assets/c256f8e50a7b4644a6d...



Regards
Steve

Blog: http://web.mac.com/stevecahill/Steve_Cahills_Blog/Blog/Blog.html


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Joe Murray
Re: EX3, Prime Lenses and 35mm adaptors
on Jul 24, 2008 at 12:19:47 pm

Great stuff, nice pics and a good blog.
Very informative.
I suppose what I'd really like is to dispose of a "twin lens system"
ie get an adaptor that will alow me to mount lenses straight onto the EX3, while
retaining the depth of field characteristics if the prime/35mm lens.




Dual 1.25 MD, FCP 4.02, CW4, 1.25GB RAM, DUAL ATTO, Medea RT480 QT6.3


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Carelton Holt
Re: EX3, Prime Lenses and 35mm adaptors
on Jul 24, 2008 at 1:25:43 pm

You might check with Dennis Wood at Cinevate.com as well. We are shooting with the EX1 using both the Letus Extreme and the Brevis 35 with very nice results. If the EX3 sales are robust, there is probably a good chance that Cinevate would produce a relay lens for the Brevis. This would not completely eliminate the "twin lens" issue, but might help with some of the vignetting and edge focus that comes from mounting any of the ground glass adapters onto the stock lens of your camera. In any event, the image quality from the EX1 is good enough that we can often eliminate either of these problems by enlarging the image about 3 to 5 percent and cropping out most all of the frame edge problems.



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steve cahill
Re: EX3, Prime Lenses and 35mm adaptors
on Jul 24, 2008 at 11:36:51 pm

Wait for the relay lens to come out then you will not have to deal with a "twin Lens" though it allows for additional zooming if you need it.

Regards
Steve

Blog: http://web.mac.com/stevecahill/Steve_Cahills_Blog/Blog/Blog.html


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Joe Murray
Re: EX3, Prime Lenses and 35mm adaptors
on Jul 25, 2008 at 7:48:39 am

At the risk of sounding dim.
What is the relay lens?


Dual 1.25 MD, FCP 4.02, CW4, 1.25GB RAM, DUAL ATTO, Medea RT480 QT6.3


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Michael Palmer
Re: EX3, Prime Lenses and 35mm adaptors
on Jul 25, 2008 at 2:29:02 pm

"What is the relay lens?"

I believe It is a lens that can allow the camera to see the image on the spinning optical plain.

Good Luck
Michael Palmer


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Don Greening
Re: EX3, Prime Lenses and 35mm adaptors
on Jul 25, 2008 at 5:29:22 pm

In the purest sense of the definition, a relay race is the act of passing the baton from one team member to another. With lenses a relay lens is the passing of the image from one lens to another lens, more specifically when you want to invert or extend the image.

- Don


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Joe Murray
Re: EX3, Prime Lenses and 35mm adaptors
on Jul 25, 2008 at 7:44:21 pm

Thanks,
So in my perfect world I will buy a relay lens - which will (re)invert the image whilst retaining the original characteristics of the lens attached to it.
Nice. Where can I get one?

Dual 1.25 MD, FCP 4.02, CW4, 1.25GB RAM, DUAL ATTO, Medea RT480 QT6.3


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Don Greening
Re: EX3, Prime Lenses and 35mm adaptors
on Jul 25, 2008 at 8:43:09 pm

[Joe Murray] "Nice. Where can I get one?"

Here's one example:

http://www.letusdirect.com/cart/letus35-ultimate.html

- Don



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Joe Murray
Re: EX3, Prime Lenses and 35mm adaptors
on Jul 26, 2008 at 10:20:29 am

Ah.
Still "twin lens" though.
Resulting in a loss of light and clarity,
if I am not mistaken

Dual 1.25 MD, FCP 4.02, CW4, 1.25GB RAM, DUAL ATTO, Medea RT480 QT6.3


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Don Greening
Re: EX3, Prime Lenses and 35mm adaptors
on Jul 26, 2008 at 6:15:02 pm

I think the Letus Ultimate reduces the available light by about one 1 F stop. Maybe a bit more. There shouldn't be any discernible loss in picture quality. One of the earliest adopters of the EX/Letus combo does awesome work and swears by them.

http://www.philipbloom.co.uk/Philip_Bloom/Home.html

- Don




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Antoine Petit
Re: EX3, Prime Lenses and 35mm adaptors
on Feb 22, 2011 at 8:38:27 pm

Hi,

I have a problem with the Ex-3 and my letus extreme. I've never had this problem before but it has been 3 years since I bought both. I would really be glad to hear your opinion about this.
Here is the thing, for some reasons when I mount the letus on to the ex-3 fujinon lens, everything looks fine until I pan. It's really strange, it feels as if the glass of the letus and the one from the ex-3 are not in sync.
Here is a exemple, when I make a sudden pan, the image doesn't stop straight on the final position, it is unbalanced for a split second and comes into the right position again. A better word would be jiggle, yes, I think the image jiggle. So i thought it was the letus who wasn't properly mounted so I screwed it tighter but it doesn't change anything.
Please, tell me you have an idea of what I'm talking about :)
Thanks!
Antoine


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Joe Murray
Re: EX3, Prime Lenses and 35mm adaptors
on Feb 23, 2011 at 10:39:06 am

It sounds like you have steady-shot turned on.


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Antoine Petit
Re: EX3, Prime Lenses and 35mm adaptors
on Feb 23, 2011 at 6:18:19 pm

So dumb I am. Thank you very much :)


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