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Stuart Campbell · June 3rd, 2008, 06:14 AM

We've just taken delivery of our 1st Letus Extreme from Zacuto and are having the following issues.

In order to focus on the ground glass you have to use the macro function. This is after zooming in far enough to see grain of course. I don't need to go on about how this renders the unit useless!

Are we overlooking something completely obvious here? Surely we are.

Of the units we've hired until now, we have always noticed how close to the end of the focus limit the ground glass sits. Here's what we are using the Letus on and how we did it.

JVC GYHD200e with Fujinon 16x5.5
26" monitor for focus, 7" LCD, 9" CRT all to check against each other.
Letus Extreme with Nikon attachment.
Siemens star chart
Daylight conditions
Studio conditions

all same result!

lenses, Nikon 24mm, 50mm, 85mm 135mm Zeiss Planars 50mm 85mm 105mm

We followed the instructions as per Letus. We've also tried focusing on GG with lenses off and on.

If anyone can point out the blindingly obvious that would be great.

2nd issue;

Whilst I understand that alignment of image sensors is not always perfect, the horizontal position of the image is WAY off!!!! Ignoring the focus issue, you'd have to zoom in a long way to fill the screen! This presents a problem when our customers ask for vignetting! (which they do). To fill the camera with the image you've zoomed way past the left hand vignette before the right hand side has filled the screen. The vertical alignment of the image is also off, by about 20 degrees, but not too much of a bother.

Is there a way of centering up this image within the Letus as its current position is far from acceptable? and how is it that of all the Letus units we have hire until now they have all had the images in different positions!! but none as bad as the one we now own!

Thanks
Stuart

p.s Also, is it just me or does anyone else find the cheap photocopy instructions page very unprofessional and lacking in detail? My opinion of Letus as a bona fide company is rapidly waning!

June 3rd, 2008, 06:14 AM	#1
Stuart Campbell Major Player Join Date: Nov 2006 Location: Hannover, Germany Posts: 321	having to use macro to see ground glass. We've just taken delivery of our 1st Letus Extreme from Zacuto and are having the following issues. In order to focus on the ground glass you have to use the macro function. This is after zooming in far enough to see grain of course. I don't need to go on about how this renders the unit useless! Are we overlooking something completely obvious here? Surely we are. Of the units we've hired until now, we have always noticed how close to the end of the focus limit the ground glass sits. Here's what we are using the Letus on and how we did it. JVC GYHD200e with Fujinon 16x5.5 26" monitor for focus, 7" LCD, 9" CRT all to check against each other. Letus Extreme with Nikon attachment. Siemens star chart Daylight conditions Studio conditions all same result! lenses, Nikon 24mm, 50mm, 85mm 135mm Zeiss Planars 50mm 85mm 105mm We followed the instructions as per Letus. We've also tried focusing on GG with lenses off and on. If anyone can point out the blindingly obvious that would be great. 2nd issue; Whilst I understand that alignment of image sensors is not always perfect, the horizontal position of the image is WAY off!!!! Ignoring the focus issue, you'd have to zoom in a long way to fill the screen! This presents a problem when our customers ask for vignetting! (which they do). To fill the camera with the image you've zoomed way past the left hand vignette before the right hand side has filled the screen. The vertical alignment of the image is also off, by about 20 degrees, but not too much of a bother. Is there a way of centering up this image within the Letus as its current position is far from acceptable? and how is it that of all the Letus units we have hire until now they have all had the images in different positions!! but none as bad as the one we now own! Thanks Stuart p.s Also, is it just me or does anyone else find the cheap photocopy instructions page very unprofessional and lacking in detail? My opinion of Letus as a bona fide company is rapidly waning!