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Search: Posts Made By: Aussie Bob II
Forum: 2.35:1 Constant Image Height Chat   03-20-2015, 09:14 PM
Replies: 3
Views: 268
Posted By Aussie Bob II
Prism-based lenses suffer from the following...

Prism-based lenses suffer from the following deficits, compared to some cylindrical lenses:

1. Utilising only plane surfaces, two prisms placed in a counter-rotated arrangement to produce...
Forum: DIY Constant Height   03-09-2015, 03:58 PM
Replies: 59
Views: 9,139
Posted By Aussie Bob II
Too much flame here. You can't put a square...

Too much flame here.

You can't put a square peg in a round hole. That's the bottom line.
Forum: DIY Constant Height   03-08-2015, 07:20 PM
Replies: 59
Views: 9,139
Posted By Aussie Bob II
It seems you won't be discouraged, so go ahead. ...

It seems you won't be discouraged, so go ahead. Get Gray's statement was not elitist. It was a statement of fact.

Go ahead and try some eyeglass elements. You may even think you've discovered the...
Forum: DIY Constant Height   03-06-2015, 02:39 PM
Replies: 59
Views: 9,139
Posted By Aussie Bob II
Eyeglass lenses, even made from glass still won't...

Eyeglass lenses, even made from glass still won't cut it.

The reasons are several:

1. Color Aberration correction
2 lenses in an enclosure aren't enough to correct fully for color aberration....
Forum: DIY Constant Height   03-05-2015, 11:43 PM
Replies: 59
Views: 9,139
Posted By Aussie Bob II
I'm blushing with embarrassment. All this talk...

I'm blushing with embarrassment. All this talk about a few words I wrote years ago AND I MISSED IT!!!



Anti reflection coatings are about 10% of the problem. Eyeglass lens blanks are not color...
Forum: 2.35:1 Constant Image Height Chat   02-12-2015, 04:57 AM
Replies: 631
Views: 69,180
Posted By Aussie Bob II
Why, thank you Cooldra. I had a similar, if...

Why, thank you Cooldra.

I had a similar, if vicarious experience recently when an installer/integrator asked me for a calculation of the curvature needed for a prestige installation. I came back...
Forum: 2.35:1 Constant Image Height Chat   02-12-2015, 12:43 AM
Replies: 20
Views: 1,428
Posted By Aussie Bob II
Good luck with removing the projector lens and...

Good luck with removing the projector lens and inserting your own anamorphic lens in its place.

I can't even begin to list the problems you'd have with THAT.

The reason there are so many...
Forum: 2.35:1 Constant Image Height Chat   01-30-2015, 04:55 PM
Replies: 631
Views: 69,180
Posted By Aussie Bob II
One of the main problems with Sony 4K projectors...

One of the main problems with Sony 4K projectors - as far as anamorphic lenses are concerned - is that the projection lens in the Sony is 35mm recessed into the case. This means that the beam is...
Forum: 2.35:1 Constant Image Height Chat   09-06-2014, 04:48 AM
Replies: 9
Views: 1,320
Posted By Aussie Bob II
Stephen, it's all part of what you have to do to...

Stephen, it's all part of what you have to do to make a good lens that consistently outperforms the opposition.
Forum: 2.35:1 Constant Image Height Chat   09-03-2014, 07:40 PM
Replies: 6
Views: 1,418
Posted By Aussie Bob II
If you are using a cylindrical lens that can be...

If you are using a cylindrical lens that can be rotated in its mount, the deterioration in screen geometry from horizontal offset is minimized.

Say you are projecting from above/left of screen...
Forum: 2.35:1 Constant Image Height Chat   09-03-2014, 07:07 PM
Replies: 9
Views: 1,320
Posted By Aussie Bob II
Three words: DON'T DO IT. You'll never get...

Three words: DON'T DO IT.

You'll never get it back together properly.

The ONLY way to clean lenses thoroughly is to completely remove them from their mounting so that deposits on the mount are...
Forum: 2.35:1 Constant Image Height Chat   06-30-2014, 03:37 AM
Replies: 8
Views: 759
Posted By Aussie Bob II
That's a TR of around 2.0. That is a standard...

That's a TR of around 2.0. That is a standard beam size, low pincushion (1.15%, corners 17mm higher than center), high contrast and ultra sharpness for a Xeit lens.

(Figures above are based on...
Forum: 2.35:1 Constant Image Height Chat   06-29-2014, 04:52 PM
Replies: 8
Views: 759
Posted By Aussie Bob II
You don't need an oil drum sized lens for Neros. ...

You don't need an oil drum sized lens for Neros.

There are at least couple of dozen Xeit lenses coupled with Neros and other Sim2 products (HT-5000, Crystal, Micos, Lumis) in $6-figure cinemas. ...
Forum: 2.35:1 Constant Image Height Chat   05-18-2014, 06:35 PM
Replies: 22
Views: 921
Posted By Aussie Bob II
Try VLC media player. You can position subtitles...

Try VLC media player. You can position subtitles anywhere with it. You can crop, stretch the image, and so on too. Just about everything's adjustable with VLC. And it's free.
Forum: 2.35:1 Constant Image Height Chat   05-17-2014, 08:30 PM
Replies: 55
Views: 2,214
Posted By Aussie Bob II
Quote:Ah, I see. Well it's a good thing I can...

Quote:Ah, I see. Well it's a good thing I can just borrow the Canon lens from downstairs before I pay for it to test it out before deciding if it's worth a couple hundred bucks. Win Win. Should be...
Forum: 2.35:1 Constant Image Height Chat   05-17-2014, 08:04 PM
Replies: 55
Views: 2,214
Posted By Aussie Bob II
Quote:I'm wondering if the drawbacks of prism...

Quote:I'm wondering if the drawbacks of prism lenses are really pronounced if you use them for vertical squeezing instead of horizontal expansion. Has anyone done this? If so, I might order some...
Forum: 2.35:1 Constant Image Height Chat   05-16-2014, 07:28 PM
Replies: 55
Views: 2,214
Posted By Aussie Bob II
Quote:The Xeit (crystalmorphic 5e) has a rrp of...

Quote:The Xeit (crystalmorphic 5e) has a rrp of AU$5999.00 and comes with a high quality stand.


This is an example of what I mean by price variations. That price includes an Australian sales...
Forum: 2.35:1 Constant Image Height Chat   05-16-2014, 07:23 PM
Replies: 55
Views: 2,214
Posted By Aussie Bob II
Quote:Aussie, to compare apples and apples,...

Quote:Aussie, to compare apples and apples, don't you think both the specs and the price should be listed on the website? If your lens costs 5-10x more than a competitor's, it seems a little...
Forum: 2.35:1 Constant Image Height Chat   05-16-2014, 12:46 AM
Replies: 55
Views: 2,214
Posted By Aussie Bob II
Quote:They are astigmatism and chromatic...

Quote:They are astigmatism and chromatic aberration free designs.


Only with the corrector, and the corrector is limited in application, as it has no adjustment whatsoever.
Quote:All optical...
Forum: 2.35:1 Constant Image Height Chat   05-15-2014, 09:19 PM
Replies: 55
Views: 2,214
Posted By Aussie Bob II
Quote:Do you have a DC1 in your possession? A...

Quote:Do you have a DC1 in your possession? A UH480? Have you actually tested this?


You don't HAVE to test it. It's simple optics. No mystery... A fixed focal length lens, even a weak...
Forum: 2.35:1 Constant Image Height Chat   05-15-2014, 09:05 PM
Replies: 55
Views: 2,214
Posted By Aussie Bob II
Quote:Two points. One - please can ANYONE point...

Quote:Two points. One - please can ANYONE point out an occurrence where Panamorph claimed to have patented "color channel pixel adjustment" processing? Anyone...?


I will.

From the Panamorph...
Forum: 2.35:1 Constant Image Height Chat   05-15-2014, 05:32 PM
Replies: 55
Views: 2,214
Posted By Aussie Bob II
Quote:Panamorph lenses are not simple prism...

Quote:Panamorph lenses are not simple prism lenses, but a patented hybrid design.


Panamorph has a patent that mentions prism lenses, but that is different to it having a "patented hybrid...
Forum: 2.35:1 Constant Image Height Chat   05-14-2014, 09:45 PM
Replies: 55
Views: 2,214
Posted By Aussie Bob II
Quote:* A cylindrical lens needs to be sighted...

Quote:* A cylindrical lens needs to be sighted and focused properly for best performance, which usually means a more complicated install. With a hybrid, installation is usually just a matter of...
Forum: 2.35:1 Constant Image Height Chat   05-14-2014, 06:49 PM
Replies: 21
Views: 1,777
Posted By Aussie Bob II
Quote:The optics were designed by an optical...

Quote:The optics were designed by an optical engineer that designs optics for Cannon Cameras. This is a 4 element / 2 lens design (fully CA corrected) with multi-asperic radii. This means that the...
Forum: 2.35:1 Constant Image Height Chat   02-19-2014, 03:36 AM
Replies: 47
Views: 3,783
Posted By Aussie Bob II
Quote:Totally agree But is there something...

Quote:Totally agree
But is there something fundamentally difficult about the lens processing? And if so, is there a cheaper way to bend the light using some other technique that is easier to mass...
Showing results 1 to 25 of 76

 
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