Tease, new Prismasonic cylindrical lens and remote motorized sled. - Page 9

12 lb plate, surely not. But if it is, add the weight of the lens, hardware and now the PJ. Now check the weight limit rating on the mount (RPM or RPA). Anyway, it's not the attachment rigidity that's an issue, it's trivial to make such a mount. The flex is in the gimbals and ceiling plates. Don't take my word for it though. The wiggle goes away in under a minute for short posts. Depends on how long you build the pendulum.

As for "purported", haven't seen one yet that wasn't "purported".

Is the up/down movement of the CB-500 a one press of the relevant button which then uses limit switches to cut the power or do you need to keep your thumb on the buttons until the lens is in the right position?

Head over to the DC-1 thread, I'll post pictures there.

Does this lens come with lens caps for when it's not in use?

Is it sealed?

Will dust get onto the inside surfaces?

We haven't really heard any details on it as of yet. Hopefully sometime soon we will get to see all of the specs, I feel like I've been waiting FOREVER for this lol.

-Sean

It's a pretty basic detail: whether the case has gaps around the lenses that will let dust and other contaminants in, or not.

Hey, don't shoot the messenger, lol. I understand that it's a basic detail, but like I said before very little details have been given. Hopefully we'll get tons of info on it in the near future.

-Sean

Hello,

Please find some information from the following links.

http://www.prismasonic.com/english/d..._hd6000f.shtml
http://www.prismasonic.com/english/d...hd6000fx.shtml
http://www.prismasonic.com/english/d..._hd6000r.shtml
http://www.prismasonic.com/english/d...hd6000rx.shtml
http://www.prismasonic.com/english/d...on_cb500.shtml
http://www.prismasonic.com/english/specs.shtml

From the product description "As a nice feature the housing has a removable bottom plate. Thus it is convenient to clean the optics from both sides." I assume (you know what that does) that the lens is in fact not sealed, but as stated can be cleaned.

-Sean

Knowing very little about lenses, I'll admit that I don't know whether the fact that it can be cleaned via removal of a panel is good or bad. Good because you have the capability to clean it; bad because there is now a perceived way for it to get dusty. Maybe out resident lens wizards can clarify (no pun...).

So does this statement... "A very large aperture 4-element optics allows to setup for throw ratios down to 1.25. To adjust a razor sharp focus of no compromise, the lens has a continous focus correction for throw distances down to 1.5 meters, and the focus does not change when removing the lens for 1.78:1 material."....mean that I won't have pincushion problems if I'm at a throw ratio of 1.6 or 1.7 to 1?

No, it will have pincushion at that TR. Sorry. How much is yet to be seen. There are other more important things to worry abotu with lenses. But for the PC, you won't see it with normal video material unless it's severe.

I guess that's a "Yes" to the dust question.

You wouldn't need a mechanism to clean it internally if it was sealed against dust.

I hope they are ready to ship soon!!

I am now thinking about going with a 2:40 Curved 156" Screen(have a 119" 16:9 now)..I have just enough wall for it by 1/2 an inch LOL

One question: Once you have a curved screen and then switch back to watch HD(cable), it will obviously have black on the sides, but will it look ok on a curved screen?, since I will be moving the lens out of the way(going to get the motorized lens)

Thanks
Steve

You will have barrel distortion of 16:9 HD images ( and less so 4:3 images) when projecting on a curved screen with the A-lens removed. If you leave the lens in place to project 16:9 HD images, you will eliminate the barrel distortion on the curved screen, but you will have to do an electronic horizontal compression of the image and that will eliminate 33% of the horizontal resolution, so this is not a good idea.

If the barrel distortion is visible, you can overscan the image a little to hide, in much the same way you can to eliminate pincushion on a flat screen when using an A lens.

Gary

Thanks for the info..I kind of figured that...I probably watch 90% movies/10% cable/PS3...So I can live with that...or just save my 119" 16:9 screen and use that when special events come up(Superbowl/Etc)

The silence is deafening....

I'm not sure how long it has been there, but the new Prismasonic ceiling mount to go with the new lens/sled is now on the AVScience site.

They are accepting waiting list spots on this at this point.

Kevin

It's been available for pre-order for sometime now.


We are near the end of March, I sure Alan will be updating us shortly on where the release of this product stands.

Knew about, and have been on the lens/sled waiting list for a while.

Hadn't seen the actual ceiling mount, though.

(P.S. Also just wanted to celebrate my reaching 200 posts JUST prior to my 10 year membership anniversary!!! I certainly am glad that others post more, as I truly have enjoyed reading and learning from everyone.)

gotcha...


I'm excited about the new product. I'm looking forward to hearing Alan's review and (maybe) comparisons to other Cylindrical lens.

It will be nice to get an impartial review of this at some point.

I skimmed thru the thread but could not find out from anything if the Lens mount on the 500 mount can drop down instead of going up. My PJ will be at the back of the room so no issue with someone hitting into the lens but I have an 8' ceiling.

Based on this post, the lens can not be installed upside down.

http://www.avsforum.com/avs-vb/showt...8#post20043058

Hello All,

I’m in the middle of planning an update to my theater and I am interested in adding an CIH screen to my setup. I’m still trying to piece together what the pros and cons are to the various CIH methods.

This new HD-6000 lens has me intrigued for the price, however I still do not understand the differences or benefits of this cylindrical based lens versus the prism based lens such as the HD-5000.

As far as I can see on the Prismasonic spec sheet (prismasonic.com/english/specs) the difference appears to be a trade-off between Aspect Control (HD-5000) and Focus Correction (HD-6000).

Due to the size of my room my throw ratio will be between 1.4. To 1.5 which I’ve gathered is not optimal. Can someone explain whether Aspect Control or Focus Correction would be of more benefit in a short throw ratio setup?

With a throw that short, a large cylindrical lens is probably going to be your only option anyway.

Mark, Thanks for the response!
Is there any way you could elaborate on why a cylindrical A-lens would be my only option. Forgive my possible ignorance on the topic. But does a cylindrical lens produce less pincushion or other visual distortion at a low throw ratio? Or is it some other reason.

Prism lenses require the prisms to be rotated, so the wider the stretch, the more rotation. This can make the prism lens quite deep.

Short throws mean wider beam angles, so the issue is being able to pass these beams through the lens or adapter and not vignette (clip the beam).



Above is a very simple diagram of both a cylindrical lens and a prism lens. The angle is calculated to represent a TR of 1.3:1. Note that the prism adapter is quite deeper than the cylindrical lens and that the beam clips at the top of the front prism.

I realized after posting that have drawn the cylindrical lens slightly wider than the prism lens, however in a real world example, that won't give it any real advantage as the real advantage comes from the ability to change the air gap (blue arrow) between the optics. Prisms lenses are fixed and you can not change the spacing.

Rule of thumb: The shorter the TR the smaller the air gap and therefore the smaller the distance from front to back of the lens.

Hope that makes sense.

I really appreciate the explanation, and the diagram really helped. Thanks!!