[ChrisWiggles]



Quote:
Originally Posted by Jason Turk /forum/post/19373282


Assuming one cares that much obviously. In my opinion people put way too much emphasis on this. Sure you want one that is decent, but there are other parameters that are more important in making a good image.


Basically one has to weigh out everything and figure out which is the best match for them.

Particularly if you're someone who wears glasses, which makes the entire question practically moot.

 

[mark haflich]

If the glasses you wear correct your vision to 20 20 or better, what does wearing glasses have anything to do with it?

 

[Jason Turk]



Quote:
Originally Posted by mark haflich /forum/post/19374264


Its funny having gone through a divorce many many years ago (there is nothing funny about a divorce) people choose a wife with less thought sometimes than in choosing a projector. Did I make the right best choice? In retrospect, whatever one chooses will probably be the wrong choice. I shouda chose something else in retrospect. Compared to a divorce, projectors are cheap.

As someone going through one right now, you are preaching to the choir.

 

[mark haflich]

Jason. I knew that already and I truly feel for you.


There are several things to look forward to. Things will get much better for you but it takes considerable time. Mostly it just money but you have kids. No matter how bad you may feel, it will be harder on them then you. So keep you head high. You love for your children will get you through this.


Another good thing is that you are only going through one. If you were going through two or more, you would be in a fecal load of trouble. You can handle one and you have lots of friends here who you can lean on for support..

 

[Jason Turk]

My 3 girls are actually adjusting quite well. Short of giving most my money away, my ex and I are quite nice to each other. And, she let me keep most my toys.

 

[mgkdragn]

There are units that do have the ability to manually align the panels, such as the Sony VPL-VW70 .. in addition, some units do have adjustment screws located internally ..

 

[mark haflich]

That is absolutely untrue. The Sony panels are nut adjustable mechanically. There position can not be changed. The appearance of misconvergence can be masked electronically but the errors are still there, they just make them co bye bye so the average user won`t complain thinking they are fixed.


The Sim2 HT5000 has adjustment screws that allow two chips to be moved in the xy directions. This requires a return to the factory. These chips are very small and multi turn caliper adjustments are what would be necessary. Try to move a chip a precise fraction of a pixel is very very difficult and nothing a user could do. If it could be done easily. the machines would all have no convergence errors, just CA errors due to lens imperfections or design limitations.


Barco has a machine where in the field through multi turn mechanical controls, two chips can be adjusted on 3 axis to achieve perfect convergence to the third reference chip.

 

[mark haflich]

Jason. At least you got to keep your most important toy. Use it wisely.

 

[mgkdragn]



Quote:
Originally Posted by mark haflich /forum/post/19402409


That is absolutely untrue. The Sony panels are nut adjustable mechanically. There position can not be changed. The appearance of misconvergence can be masked electronically but the errors are still there, they just make them co bye bye so the average user won`t complain thinking they are fixed.

the Sony VPL-VW70 projector's panel shift feature allows a user to achieve visibly perfect alignment convergence .. although I am unfamilliar with the aspect of how it actually works, it does, in fact work .. and visibly perfect convergence is what we are looking for, no ..??

 

[ChrisWiggles]



Quote:
Originally Posted by mark haflich /forum/post/19383244


If the glasses you wear correct your vision to 20 20 or better, what does wearing glasses have anything to do with it?

You're sticking big lenses in front of your entire world, which yield significant chromatic aberrations (depending obviously on how strong the glasses are and their refractive index). So you get used to normal life being rife with color fringing. And everything but the center of your vision, whether it be your projector screen or real life, is going to be "misconverged" by CA artifacts. So you quickly stop caring about minor misconvergence.


You also learn, as an old-school CRTer like me, to converge your CRT projectors right up next to the screen without wearing your glasses!

This is why I always try to include the caveat that I am not very picky when it comes to convergence issues, because it's just not something worth being concerned about for me, because I wear moderately strong glasses. It's also something I always drive my optomitrist nuts about because I am one of those jerks who complains about the lenses having too many geometry and CA artifacts, and then turns around and complains about my lenses being too thick and heavy!

 

[mark haflich]

MGK. It doesn`t fix the misconvergence. It just hides it from your eyes. The panels remain misconverged. If one shifts the image on a chip by full pixel widths, which can easily be done with timing changes there is little costs image wise by doing so. You lose only one line of resolution at the edge per full pixel width shifted. However, sub pixel misconvergence which are what most people have and that can not be fixed. The pixel lines on a chip are fixed. The chip must be microscopically aligned. This causes people to ***** and return projectors. So what did Sony do? They provide a feature to make the misconvergence line separation appear to go away. All of a projector's flaws go away if you blind fold your eyes and wear ear plugs. Great. What Sony did was to use two adjacent pixels where only one should be used. Simplifying, they move the line by using parts of two pixels to create a new line where it should ideally have been in the first place. The new line also has the interpixel space in it. The net result is a loss of resolution and sharpness at each spot where two pixels instead of one are used. Some respected reviewers think the trade offs are worth it if only say .1 or .2 of a pixel misconvergece need correction this way. .3 or .4 no way. Many don`t like it at all, including myself. It does make the error the customers can easily see go away though. Dealers love it. If you carefully read the manual, there is a foot note or some other note warning the user of the adverse effects.

 

[mgkdragn]



Quote:
Originally Posted by mark haflich /forum/post/19403073


MGK. It doesn`t fix the misconvergence. It just hides it from your eyes. The panels remain misconverged. If one shifts the image on a chip by full pixel widths, there is little costs image wise by doing so. You lose only one line of resolution at the edge. However, sub pixel misconvergence which are what most people have can not be fixed. The pixel lines on a chip are fixed. The chip must be microscopically aligned. This causes people to ***** and return projectors. So what did Sony do? They provide a feature to make the misconvergence line separation appear to go away. All a projectors flaws go away if you blind fold your eyes and wear ear plugs. Great. What Sony did was to use two adjacent pixels where only one should be used. Simplifying, they move the line by using parts of two pixels to create it. The new line also has the interpixel space in it. The net result is a loss of resolution and sharpness at each spot where two pixels instead of one are used. Some respected reviewers think the trade offs are worth it if only say .1 or .2 of a pixel misconvergece need correction this way. .3 or .4 no way. Many don`t like it at all, including myself. It does make the error the customers can easily see go away though. Dealers love it. If you carefully read the manual, there is a foot note or some other note warning the user of the adverse effects.

appreciate the info .. certainly something that does not appear to be widely known .. Sony's info is somewhat misleading then ..