CurtPalme.com Home Theater Forum

[Revox]

First of all, i must say that i cannot see a big difference between those two lenses.
But first, let me tell "my story".

On the Cristmas hollydays i met my Granduncle and ask him if he has got the ability to bould up lens adapters.
So i ordered a 8mm piece of aloy on ebay....
The answer was "yes" and we spend a lot time boulding them. So the whole thing has a more idealic worth.
As you can immagine, its much more fun to build something together than drinking tea, especially with familie members.


Someone of the Beisammen forum sold me HD 145 for 30€ inkl shipping, so i don't have to steal the HD 145s (and replace HD6ml) from my friend with a Barco 701s.


The screws arrived yesterday and i had already modified the HD 145s. I must say that it was really horrible to screw thread because its not metric.


Testing the Sharpnes before, i used a txt file with lettersize 5. So if its possible to read all Numbers, the lens is really sharp.
I testet with monochromatic green. In the middle it was not a problem to read, in the eagde it was realy hard mabe not possible.
With the HD 145 it's quite sharp in the middle of the screen, and in the corners? It's hard to read too.

After another 1 Hour of redo the Scheinplug correction, i am a little bit disappointed
There is nothing more to optimise in the magnetic setup (By the way, is it normal that red is not as sharp as green, or is it more a problem caused by my eyes?).

I use nearly the whole phosphor face (3mm from the edges) what i think is, that the picture is a little bit more dimm in the corners than before.


The good thing was, that i had to move the PJ only 5cm by 2,7m screen size.

So mabe you got a few tipps for me?

So my conclusion is: Buy PT 65 Lenses, when you have already colourfiltered the glykole.


Pictures:
Screenshot with textsize 5 in the middle of the picture, you can see the scanlines (i juse 1080i at 75Hz)
Lensmount detail
PJ before Modification (sorry i got no Fotos afterwards, but the look is not as monsterous than before)
Lensmount

[waterlily]

Some time ago when I used a Sony 1252 I tried HD144s vs. the PT65's it had come with.
I spent many hours dialing things in, using test patterns, etc
I could not make my mind up if one was any sharper than the other.
Even with the 1252, the lenses were the bottleneck since the image on the CRT was always so much sharper than on the screen.
Kinda left you wishing you could get on the screen the sharpness one could appreciate on the tubes.

I did try the PT65s on a air coupled 8" Marquee vs. HD8s revs A and B.
The PT65s were easily sharper than the HD8s.

BTW neat mods for the adapters

[kschmit2]

[Revox]

I think the same about the 12xx AC Pj's too. When the problem is the "bad electronical" focus on my Marquee with 1200h on electronics and tubes, the Sony can't bring such a sharp immage to the phosphor.

What about the problem with the dimmer picture on the right end left bottomside (the side were the keystone correction extands the picture to the maximum with)? The problem in the moment is, that i have the fear to made a bad change.
Do anyone else noticed a dimm picture in the corners?

I loked a film yesterday and for me it seemed that the inpicture contrast is a little bit better. The film was Nude Nuns with Big Guns (what a waste of time!) and it deals a lot with dark and light extremes, so mabe its only fancy. The Halos are definitly smaller, but i don't know if the intense is lesser.

So are 144 even sharper than HD 145?

Mabe there are other benefits. For example convergence shift. The PT 65 is a complete Plastic lens, the hd 145 seemes to be made of glass.

The interesting thing is, that the PT 65 went as near to the tube as the HD 145 now. Ill definitly keep those PT 65 lenses!
So if someone with HD8s has the chance to get those lenses Cheap, go for it!

[kschmit2]

HD-145 and HD-144 are pretty much the same.

Both are Hybrid lenses (like most high quality lenses for photography). Plastic is not used to save money, but because of it's benefitial characteristics when correcting for certain lens errors.

[virusc]

all of the 12xx various lenses I have ever seen including the 65 were inferior to standard hd-8 rev b lenses. (excluding 1292 of course) temperature effected them a lot and they were clearly less sharp than HD-8 and others. You should see a large difference with 145's so something is wrong. Put it up to a LCD monitor and focus it on a wall and see for yourself. One upgrade I would suggest looking into is converting to LC as prices have dropped on lenses and bellows.

[Revox]

I tested the HD 8rev B against the PT 65. My conlusion was that the PT 65 was realy slightly better.
The Idea with the LCD Monitor seemed to be simple and realy good!

Mabe i should not think any longer to sharpen the Immage. The last HD Film i saw is month ago. Last time i saw a film, was an VHS Rip, picture bad, film good....

[Elaine Benes]

Revox: I totally agree with your conclusions, ESPECIALLY the note about the corners being dimmer when using the HD 145's... I noted the exact same thing when I tried them. I also concur with your conclusion that they are NOT, in any way, definitively sharper than the original lenses...

[noos@xp37+]

Hello Revox,


thanks for the details. You have just increased the ebay price for PT65s. You had to move the projector 5cm towards or away from screen when mounting the 145s instead of the pT65s?

Like I wrote you on Beisammen, my excessive curved screen experiments showed that: HD8ml were very bad (compared to the others, but usable), HD8Revb was much better and HD6mlc and HD145 allowed the deepest curved screen (the same amount as special full metal/glass curved screen AC lenses I own). So I guess your review showed that Pt65s are a good 8" alternative.

Best regards


Marc

[virusc]

HD-144/145 have more resolution but yes you will get dim corners due to the fact that you are way outside the sweet spot for the lense as it was meant for 7" CRT faceplate at that distance. I would suggest doing a search here and AVS as their was a ton of information about this a few years ago. I don't know how you guys are seeing that PT65's are better than HD-8rev B. PT65's are old and US Precision lenses got better the later they were made especially for HD-8/9 series across the board. The original HD-8's metal case then plastic then the sony specials were quite bad in many ways even compared to HD-6c lenses.

[Revox]

I think one year ago, i got the HD8revBs and those PT65 lenses from my Sony 1271.
I tested both of the lenses and noticed a slightly difference. According to the following link, i choose the PTs and sold the HD8s for 1€ (shame on me).

http://72.9.159.100/avs-vb/showthread.php?p=9655410

Because i got the fear that the old post on AVS got lost, i uploded the pics again.

They were taken on a Barco Graphics 1208s/2.

[virusc]

that is a large difference I think. I had a barco 1208s/2 I think it was a `1998 model that came with hd-8revb lenses and I did test at the time different HD-8 lenses and the rev B's were the sharpest. Also they had the best ANSI contrast. I have no idea why your results were the opposite.

[Revox]

I don't know the guy who made these fotos, but according to these the PT 65 are much sharper (notice the picture names).