Isco III S - Page 2 - AVS Forum
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post #31 of 49 Old 02-21-2008, 11:24 PM
 
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Yep, just measured it. Diameter of rear element is 70mm.

You get used to judging the diameter of circles when you design so much glass that goes in the middle so often.

I must try my own lens with one of these C3X contraptions. It's rear element is 70mm too. Could have been a bit wider, but I was contstrained by the mechanical design of the rest of it.
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post #32 of 49 Old 02-22-2008, 12:36 AM
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So how does 70mm compare with the ISCO II?
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post #33 of 49 Old 02-22-2008, 06:21 AM - Thread Starter
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Quote:
Originally Posted by Aussie Bob View Post

You get used to judging the diameter of circles when you design so much glass that goes in the middle so often.

I must try my own lens with one of these C3X contraptions. It's rear element is 70mm too. Could have been a bit wider, but I was contstrained by the mechanical design of the rest of it.

Don't forget, the one I tested it on was a C3X720, not the C3X1080. I think the 1080 panel is larger and thus the light beam is larger. I don't think the IIIs will work with a C3X 1080 (but I don't have one available to verify).
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post #34 of 49 Old 02-22-2008, 02:18 PM
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ISCO II is 65mm. Fits a 50+mm or so wide beam on the intake.
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post #35 of 49 Old 02-23-2008, 12:46 AM
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Thanks coolscan.
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post #36 of 49 Old 12-13-2008, 05:22 AM
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Quote:
Originally Posted by GetGray View Post

Yep, just measured it. Diameter of rear element is 70mm.

Do you think the ISCO IIIs will be likely to work with the JVC RS20?

Never become so involved with something that it blinds you.
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post #37 of 49 Old 12-13-2008, 06:42 AM
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Scott is the expert so I'll let him elaborate. (however I was told by JVC reps at both CEDIA & EHX that ISCO III will work fine w/ RS20. It's Schneider that is the problem lens for RS20)
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post #38 of 49 Old 12-13-2008, 06:48 AM
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Quote:
Originally Posted by John Ballentine View Post

Scott is the expert so I'll let him elaborate. (however I was told by JVC reps at both CEDIA & EHX that ISCO III will work fine w/ RS20. It's Schneider that is the problem lens for RS20)

Yes I'm sure the ISCO III Large one will work but what about this smaller S version? It is significantly smaller and it looks like the Schneider lens has about the same size lens as the S version?

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post #39 of 49 Old 12-13-2008, 08:40 AM
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Of course you meant the smaller lens (I forgot what thread this was).

I did read in the UK forums that at least one person was able to get the Schneider to work w/ the RS20 at a very long throw.

Considering the few RS20's in the country right now - it's doubtful anyone has tried the RS20/ISCO IIIs combination. I wonder just how many of the smaller ISCO lenses are really out there?
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post #40 of 49 Old 12-13-2008, 10:56 AM - Thread Starter
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I'm on JVC's wait list for a demo unit. As soon (if) I get one I'll test it.

My expectation is that it will work, but would not advise ordering until we know for sure.

As for availability, I can get the S for anyone who wants one. I am however partial to the future proof IIIL. It won't matter what PJ you ever change to, the L will fit most everything out there.

Best, Scott
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post #41 of 49 Old 12-13-2008, 06:25 PM
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GetGray - what is the difference in the MSRP for the Isco IIIs and the larger III?
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post #42 of 49 Old 12-13-2008, 06:30 PM - Thread Starter
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Not supposed to discuss pricing, but I guess a difference is OK. Ballpark, 1 Cleveland difference. (with transport). FYI, there are some photos of the IIIS with the older JVC (Meridian) at CEDIA 08 on my website photo's link....
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post #43 of 49 Old 12-14-2008, 05:01 AM
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Quote:
Originally Posted by GetGray View Post

Not supposed to discuss pricing, but I guess a difference is OK. Ballpark, 1 Cleveland difference. (with transport). FYI, there are some photos of the IIIS with the older JVC (Meridian) at CEDIA 08 on my website photo's link....

Thanks. Sorry if I broke a forum rule, but I thought talking MSRP prices was OK. Now I just have to wait and see if it will work with a JVC RS20.
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post #44 of 49 Old 12-14-2008, 07:36 AM - Thread Starter
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You're right MSRP talk is OK.
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post #45 of 49 Old 09-05-2009, 07:00 AM
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Quote:
Originally Posted by GetGray View Post

I'm on JVC's wait list for a demo unit. As soon (if) I get one I'll test it.

My expectation is that it will work, but would not advise ordering until we know for sure.

As for availability, I can get the S for anyone who wants one. I am however partial to the future proof IIIL. It won't matter what PJ you ever change to, the L will fit most everything out there.

Best, Scott

Did you ever test it?

Never become so involved with something that it blinds you.
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post #46 of 49 Old 09-05-2009, 07:34 AM - Thread Starter
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No but JVC did. And I have a customer who verified it will work cleanly at a 1.6 TR.

And, to avoid ambiguity over whether or not that is 1.6 * the 1.78 or 2.35 width, I use this formula which takes all doubt out:

Distance = (Screen Height)/.5625*(Throw Ratio)

So for the JVC and a IIIS you are safe if your distance from screen to Projector is at least:

(Screen HEIGHT) *2.84


HTH
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post #47 of 49 Old 05-15-2012, 09:57 AM
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Quote:
Originally Posted by GetGray View Post

No but JVC did. And I have a customer who verified it will work cleanly at a 1.6 TR.

And, to avoid ambiguity over whether or not that is 1.6 * the 1.78 or 2.35 width, I use this formula which takes all doubt out:

Distance = (Screen Height)/.5625*(Throw Ratio)

So for the JVC and a IIIS you are safe if your distance from screen to Projector is at least:

(Screen HEIGHT) *2.84


HTH


Is this still true? Anyone ever confirm with an actual setup?
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post #48 of 49 Old 05-15-2012, 10:07 AM - Thread Starter
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I have several customers with that setup.
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post #49 of 49 Old 05-17-2012, 07:23 AM
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I think I will end up with about 16' throw distance. My screen height will be 55.3" so 55.3 * 2.84 = 157.05 or about 13'. Sounds like I am well within acceptable distance. I wonder how this lens would compare to the Prismasonic H1200R lens I have now?
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