Bob Hart

Stuart.


Did you source the Letus Extreme and the Zacuto kit together from Zacuto as a turnkey solution or were they bought in separately? You may have already said this so forgive me if I am repeating myself.

Sometimes there is different interpretation between US English and Strine on the same sets of words, so all I am doing to trying to eliminate any misunderstanding on my part. I hope I have not created mischief here.

Distorting alignment? - That sounds cruel bad. I was meaning your rig may have had some latent stresses already in existence deviating the two axes off true and moving the fittings might bring the alginment back in.

If you are having to do some serious bending then maybe the Letus has had a serious clout in shipping and moved something inside but the co-incident focus issue suggests something else.

It would be interesting to find out which dioptre is in back of your Extreme. I understand there are more than one version, some intended for a particular camera type.

Hopefully this may be the source of your problem with this particular adaptor and represent the potential cure.

I don't know whether there is a particular optimisation for the JVC GY-HD--- family.

Where your camera mounts to the rails, are there lateral adjustments and vertical adjustments?

When setting up, it is possible to introduce deviations with camera weight alone whilst trying to match it all up by hand.

I find it helpful to point the whole assembly nose upward when I tighten the assembly it to avoid camera weight bending on the Letus Extreme / Camcorder junction. This is not necessarily factory approved practice, just my own possibly bad habit.

One more experiment you might try is to take out any spacer or ring which is between the back of your Letus Extreme and the front of your Fujinon filter mount to enable you to move the Letus Extreme physically as close to the front of the Fujinon lens as you can get it.

This spacer will be the mounting ring which has three allen screws on radial centres locking it onto the back of the Letus Extreme. Taking this out and supporting the adaptor by hand, loosening the Letus support on the rails and moving it closer to the front of the Fujinon will give you an extra 9mm or so closer position to front of the Fujinon lens.

If this makes the focus worse by requiring more Fujinon macro to be turned in to focus or is even moving out of its range, then try adding some distance between the Letus and the Fujinon lens.

- The Fujinon macro may be comprised of a simular retrofocussing element as the larger ENG lenses. For best results without edge softness I think your Fujinon backfocus must be spot-on and no macro turned in or out.

This may seem counter to Ted's solution however he has optimised his arrangments around custom positionings of his achromat and his dual duty 35mm and medium format adaptor. I think his achromat is also from Wayne Kinney for a non-flip adaptor.

There are many effective ways to achieve the same cat skinning.

There is some interaction between achromat position in front of the Fujinon lens and this rear focussing element in the Fujinon.

If you can post the images of your setup and a frame grab of objectionable images, this might steer us in the direction of a solution for you.

However - before doing any more experiments, wait for a few more responses here unless you are up against a tight deadline to get this sorted.