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Discussion Starter · #1 ·
Well, here is my review of the Panamorph P752. My review is hobbled by the fact that my current lens (1.2:1 fixed) projects an extremely large image, way too big for the P752's entrance aperture. This makes adjustments a pain in the neck, as I have to move the lens to view my desktop (no, I haven't assembled the rail yet).


When I got the box, I first noticed the sound of some things jangling inside. I thought, uh oh, broken glass, but a closer listen told me it was the sound of little pieces of metal (the components of the rail assembly). So don't freak out when you get your box. When I opened the box, I saw that the lens was packed in dense foam rubber, with raised cones. A very sturdy package. I noticed what looked like a kind of smudge on the lens. This was from a small amount of oil that leaked out. I'd say about half a teaspoon total. It was around 94 degrees yesterday, so I'm not too surprised that the heat causaed the oil to expand. Now that it's been at around 70 degrees for over 24 hours, it looks like there is just a faint trace of oil. I'm just telling you what I've seen.


I had to electronically shrink the image with YXY to avoid vignetting. I watched scenes from Blade, North By Northwest, Akira, The Gift, The Road To El Dorado and the overscan pattern from Avia. Thge picture appears sharper, or maybe I should say, more detailed. The effect was a smoother look to the image, which is pretty much what I expected. I spent over a year with the ISCO I lens and the P752 does not produce a softness like the ISCO. The image is very clear. I also had no problem obtaining a sharp image. When looking at the lens, it looks like there is no oil in the assembly. It is that clear. Color saturation appeared to be improved. I really liked that. I did notice some ghosting in the image with my desktop icons. This was at the lateral edges of the lens. Towards the center, it disappeared. I suspect that if I had a normal size lens, this would disappear. My image is very, very large.


Overall, I saw an image that appeared to be more detailed and thus more film-like. Visibility of pixels was reduced, color saturation appeared to be improved and the image had more depth. The effect is undeniable. As to the increase in brightness, I had to shrink my image to get it onscreen, but of course, the image per square inch is brighter and with more punch. I tried the half Panamorph/ half regular lens, split screen. With the P752, the image was clearly more dense and had more depth. I think people who saw the pictures from the panamorph party know what I mean.


The lens itself comes with a bracket that attaches to the main lens on each side via two screw knobs. You can adjust the height of the Panamorph (while it is on the bracket) as well as its tilt. Trust me, this isn't rocket science. I had trouble getting the correct tilt, but that's because I couldn't see either edge of the image. I tried to adjust the tilt until I obtained a fairly equal barrel distortion. Barrel distortion is a curved distention in the horizontal plane. The ISCO had a similar issue: pincushion, which is a concave "pinch" in the vertical dimension. The barrel distortion didn't bother me, as it wasn't extreme. This is a total non issue if you use a constant width scheme in your HT, since the edges of the image should be eaten by your lateral masking. For people who are picky and use a constant height approach, you may want to look at masking the sides off.


This is not by any means an exhaustive review. Overall, I am very impressed, particularly with the clarity of the image, which blows away the ISCO I. Of course, the big downer for me, is that I need another lens for my DLP. But I am impressed with what I've seen. I would say to people who are anxious, this is not like flying a 747 with no experience. http://www.avsforum.com/ubb/smile.gif It's basically very simple: place the P752 in front of your projector's lens. Adjust the height until the image is centered through the P752. Adjust the tilt until you have an even barrel distortion (this will sound familiar to ISCO users) and an even compression (the tilt changes the compression). I will assemble the rail system and post that later (tomorrow, if not today).
 

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Larry

Thanks for the review. I'm sure you have made many people happy

For the oil on the lens, did you clean it off with any particular product, or the usual lens cleaning solution

Thanks

Michael


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tuckerdog
 

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Thanks for the review Larry. Hope the oil leak thing isn't going to be a problem.


For anyone else out there (like me) who didn't know what "vignetting" is, I found this definition:

Quote:
In optics, vignetting ("vin-YET-ting") is when the field of view is cut off on one or more edges because of the physical construction of the lens or housing.
 

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Discussion Starter · #5 ·
Hi Michael,

Shawn recommended regular glass cleaner. I tried that. I got better results with a combination of professional lens cleaning fluid and lens tissue. That worked much better. It's mostly alcohol (it smelled like isopropyl alcohol).


Hi Chris,

Well, most liquids expand as they are heated. I'd say at 94 degrees, that is going to put some stress on the seal. I just inspected the joint/seal. There appears to be a super thin film of oil at that spot. If I press it, I can see some oil at the joint. The oil doesn't appear to be dripping out. It's like a very thin film of it is present at that seal.


The vignetting shouldn't be a problem for just about everyone else. I am using a lens that was probably designed for rear projection. It weighs more than my DL450 and is larger than a movie theater lens. You shouldn't have a problem.
 

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So this is a fluid filled, two piece lens? I didn't understand where the oil came from.


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Joe (Boy am I sick of reregistering!)
 

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Larry

Thank you for the review. Have you looked at VE/Avia test patterns such as resolution/circles/x-hatch/pluge to see things such as linearity,color shifting,brightness and resolution ?

I am most interested in hearing the effect of tilts and geometry and the correction that the Panamorph offers.

Sounds like you where pretty impressed (except the drama of your big apature which is not a Panamorph problem)


DavidW
 

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Discussion Starter · #9 ·
David, I was going to do that, but the flux coils on my quantum phase shift inverter need recharging.


Seriously, I will take a closer, more critical look, later. Specifically, after I get back from Dr. Butcher oh, I mean my dentist.
 

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Perhaps in honor of the dentist appointment, your first panamorph movie should be Little Shop of Horrors.


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What?! Me worry?
 

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Not to rub things the wrong way but you have to love the butcher (dentist). Not only do they give you pain but they charge like a wounded bull for providing such pain.

Sorry but I have had some bad dentists and they all seem to live by that rule "No pain No gain". Just a shame I am never the one who gains.


DavidW
 

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Larry,


When will you try the old ISCO+Panamorph combo to get 2.35 out of one of your projectors ?


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Kirk Ellis

G1000 D-ILA, HTPC, Panamorph (soon I hope),

Dish 6000 (HBOHD,SHOHD,CBS,NBC,ABC,WB,FOX,UPN, KCET -- does it get any better ?)
 

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Quote:
Originally posted by RussSchultz:

Perhaps in honor of the dentist appointment, your first panamorph movie should be Little Shop of Horrors.
...or perhaps Marathon Man?



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The button is labeled "Play", not "Pay". STOP the MPAA!

Our Silent Angels

Please visit The Manny Page!
 

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The original "The Dentist" will keep anyone away from them for awhile. My guy is virtually painless and I keep telling him he should see this movie just to make himself cringe. Sorry, off topic but I didn't start it and I don't have a Panny on order. Hot damn....they sure sound neat though.


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Ron
 

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Hey Larry, you have sympathy for you root canal. Hopefully you have a great dentist and the pain is minimal. Thanks for the post!!!!!!!!


Scott
 

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Quote:
Originally posted by dreamer:
Larry,

When will you try the old ISCO+Panamorph combo to get 2.35 out of one of your projectors ?
Larry sold his ISCO, I believe.


Mike




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Join the NYC-area HT club! Send me e-mail!
 

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Discussion Starter · #18 ·
Hi Guys,

Thanks for the sympathy. I got a big kick out of Russ' reference to Little Shop of Horrors. The original scene with Jack Nicholson was hilarious. I have to go back next week. I apologize for getting the thread off topic. As the starter of the thread, I accept my own apology. http://www.avsforum.com/ubb/wink.gif


I put the rail together. It was super easy. I put the lens/rail/bracket in front of my projector and slid the lens from one side to the other. I had no problem.


All the metal parts have an anodized black finish. It adds a sophisticated, high tech look. I think you will be impressed by the machining of Shawn & co. It looks very professional and can stand proudly in the same room with your Krell amps. The rail also comes with four tiny (black) screws with wide heads. You put this on either side of the rail. This prevents the lens from sliding off the rail. There is also plenty of space in the rail for bolting or screwing it into your ceiling/hushbox, with a total of four mounting holes.


The rail is a necessity for viewing 4:3 material on your 4:3 projector. You just slide the lens out of the way to view TV, old black and white films, IMAX DVD's, etc. You could electronically manipulate the image with an HTPC and YXY, but Shawn implemented this feature at the request of forum members. I'm glad he did it.


As for the oil leak, I know Shawn is addressing this and he will fix it. The leak is microscopic. Meaning, it is exquisitely slow. It is leaving a super thin sheen on the bottom of the lens. I have faith that this will be fixed asap.


Over the weekend I will put up Avia and take a close look at the image with Avia patterns.


Overall, I can say that assembling this is very, very, easy. There should be very little hand holding to get people up and running. of course, if anyone has a question, they should ask. But the hard work has already been done by Cygnus. We get to lay back and enjoy it. http://www.avsforum.com/ubb/wink.gif


[This message has been edited by Larry Davis (edited 07-27-2001).]
 

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Hey guys- enough with the dental jokes. I must be doing something right as a general dentist as I'm personally booked 3 months ahead, which allows me to buy the toys we all enjoy on the forum. Let's stick to the topics, OK?
 

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Quote:
Originally posted by Chuck B:
Hey guys- enough with the dental jokes.
Chuck, why so sensitive? I'll make you feel better by telling a lawyer joke:



Why has the NIH recently approved the use of lawyers in controversial lab experiments?


Because there are some things that even a rat won't do.



there, feel better?
 
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