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Sony NXCAM NEX-FS100 CineAlta
An interchangeable lens AVCHD camcorder using E-Mount lenses.


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Old July 30th, 2012, 05:52 AM   #1
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LA-EA1 and Sal1650 lens

Hi there

Ive just bought a Sony SAL1650 lens along with a LA-EA1 adapter.

When I open up the iris, the lens briefly opens right up (gets really bright) for a brief flash at each turn before adjusting to the new iris setting. Is this normal?

It works fine, adjusts fine, I think I'm just used to 'smooth' internal adjustments. Wanted to check everythings in order

Cheers

Jamie
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Old July 30th, 2012, 08:35 AM   #2
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Re: LA-EA1 and Sal1650 lens

That's normal. For some reason the Sony adapters have to open the aperture all the way, then stop down to the appropriate setting. Its annoying to get the click and white flash - so you can't open up when recording unless absolutely necessary. I have a Singh-Ray vari ND to make small exposure adjustments while rolling without the need to adjust the aperture. I'm frequently out in the sun, and when clouds roll by things can get wonky really quick.
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Old July 30th, 2012, 08:51 AM   #3
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Re: LA-EA1 and Sal1650 lens

Now that we're on the subject of the LA-EA1, what is the main difference between the LA-EA1 and LA-EA2? It probably has something to do with the 'Translucent Mirror Technology', but I don't know what it means. :)
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Old July 30th, 2012, 09:58 AM   #4
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Re: LA-EA1 and Sal1650 lens

The EA2 has a transparent mirror which helps autofocus work a lot faster. It does however mean a little light loss compared to the EA1.

I have an EA2 and I use it with a SONY16-50 and Minolta 28-75 and 70-210. The iris changes in discreet jumps which is noticeable in the footage but not as bad as the EA1 jumping open each time.

The autofocus on the EA2 works well but locks the iris to 3.5 so you would have to change exposure with gain and/ or variable nd's.

On the FS100 you can also use the push to autofocus button on the camera to temporarily enter autofocus but it puts the entire camera into auto. Iris, gain, white balance and shutter speed all go auto while it's active.

If you can do without the iris value on your display and any option of the auto functions (although not perfect) just get a dumb adaptor from ebay with the iris ring on the adaptor. Works pretty well.

M.
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Old July 30th, 2012, 02:54 PM   #5
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Re: LA-EA1 and Sal1650 lens

Thanks for the explanation Michael.
Too bad the autofocus is locking the iris to 3.5. Makes it difficult to use it on a Steadicam.

I now have a Novoflex adapter to use my Nikon lenses on the FS100, but I would rather have a good ultra wide lens with autofocus and iris for Steadicam use. Not sure the LE-EA2 (or 1) would be good for this purpose. Espcialy because the locked iris with autofocus. Good to know!
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Old July 30th, 2012, 06:10 PM   #6
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Re: LA-EA1 and Sal1650 lens

Thanks Chris.

The reason I found a LA-EA1 (at $155AU) over the EA2 was after buying the SAL1650 and a Var_ND, there was too much of a jump to the EA2 adapter in price for my budget right now, and I couldnt find enough info to convince me the extra cost would be worth it.

I have a Lightcraft Fader ND that I will use for small aperture changes

Cheers

Jamie
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Old July 31st, 2012, 03:45 AM   #7
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Re: LA-EA1 and Sal1650 lens

Quote:
Originally Posted by Derran Rootring View Post
Thanks for the explanation Michael.
Too bad the autofocus is locking the iris to 3.5. Makes it difficult to use it on a Steadicam.

I now have a Novoflex adapter to use my Nikon lenses on the FS100, but I would rather have a good ultra wide lens with autofocus and iris for Steadicam use. Not sure the LE-EA2 (or 1) would be good for this purpose. Espcialy because the locked iris with autofocus. Good to know!
Hi Derran!

I don't own the EA2, but from what I understand it doesn't "lock" the lens at F3.5 for autofocus to work; you can set the lens at any F-stop higher or equal to F3.5 - so with say F8-10 (which is best on a stabilizer) you are good to go!

Piotr

PS. Anyone please correct me if I'm wrong :)
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Old July 31st, 2012, 10:51 AM   #8
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Re: LA-EA1 and Sal1650 lens

Just to clarify what I've already said, you have no choice. If you enable autofocus the lens goes to 3.5 and will not move.
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Old July 31st, 2012, 10:59 AM   #9
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Re: LA-EA1 and Sal1650 lens

I stand corrected then - thought it's only limited from one end; bummer :(
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Old July 31st, 2012, 04:57 PM   #10
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Re: LA-EA1 and Sal1650 lens

Yeah, I checked again with mine and it's a bit of a pain. The push button is fine if you want to let the lens find focus quickly but while it does that the shot will almost be certainly useless as all the settings go auto for a while.

I suppose Sony doesn't want to make it too good otherwise people like me won't spend money on new emount lens when they appear. :)
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Old July 31st, 2012, 06:16 PM   #11
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Re: LA-EA1 and Sal1650 lens

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Originally Posted by Piotr Wozniacki View Post
I stand corrected then - thought it's only limited from one end; bummer :(
Yes this is a real bummer!
I was hoping to get a LA-EA2 with Tokina 11-16mm for Steadicam work, but now it doesn't sound like a good option anymore.

Hopefully with the release of the FS700 and other NEX cameras, lens manufacturers are busy making a few more E-mount lenses. In particular Ultra Wide Lenses. Now we only have two options. The very expensive Zunow lens (around $4000) and the very cheap 16mm pancake lens with ultra wide converter, where you can't use a ND filter on. So unless I'm missing something, there aren't a lot of options!
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Old August 2nd, 2012, 10:00 AM   #12
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Re: LA-EA1 and Sal1650 lens

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Originally Posted by Derran Rootring View Post
Yes this is a real bummer!
I was hoping to get a LA-EA2 with Tokina 11-16mm for Steadicam work, but now it doesn't sound like a good option anymore.
Why not? Do you need AF on a steadicam? I never use AF and I'm by no means any sort of an expert. At moderate apertures - like f5.6-8 there's a nice balance between the size of the focal plane and the OOF background. Besides won't the AF relentlessly hunt with constant motion?

There are other options for UWA's with the Metabones adapter and Canon lenses. The Metabones is about $100 more than the LAEA2 and it opens up a lot of glass and IS.
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Old August 2nd, 2012, 10:32 AM   #13
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Re: LA-EA1 and Sal1650 lens

It's not so much the AF, but more the auto iris. It's really difficult to change iris when your camera is on a stabilizer and when you're walking around, lighting conditions change all the time. Auto iris is not ideal but does help a lot. So, the Metabones adapter you're talking about might be interesting.
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Old August 2nd, 2012, 07:41 PM   #14
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Re: LA-EA1 and Sal1650 lens

why not just use a Zeiss 24mm 1.8 on a steadicam?
I don't have the vest and arm for my glidecam HD 2000, so i stick with the 16mm pancake to keep the weight low, and it still do very well
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Old August 4th, 2012, 07:09 AM   #15
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Re: LA-EA1 and Sal1650 lens

Quote:
Originally Posted by Derran Rootring View Post
It's not so much the AF, but more the auto iris. It's really difficult to change iris when your camera is on a stabilizer and when you're walking around, lighting conditions change all the time. Auto iris is not ideal but does help a lot. So, the Metabones adapter you're talking about might be interesting.
What about auto ISO?
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