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416ray4538
Joined: 14 Jul 2009
Posts: 517
Location: near Toronto Ont
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| Posted: Thu Mar 13, 2014 11:21 pm Post subject: Focus |
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To use the phosphor grain method for optical focus, what mag binocs would you use?
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When the first clock was invented, how did they know what time to set it to?
No point being pessimistic; it probably would't work anyway.
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Nashou66
Joined: 12 Jan 2007
Posts: 16171
Location: West Seneca NY
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416ray4538
Joined: 14 Jul 2009
Posts: 517
Location: near Toronto Ont
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| Posted: Thu Mar 13, 2014 11:31 pm Post subject: |
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NP
I have a pair of 10X25 and I can just make out the pixels on a 720 Plasma 42"; not good enough for this task I think. Just asking
Thanks
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When the first clock was invented, how did they know what time to set it to?
No point being pessimistic; it probably would't work anyway.
Last edited by 416ray4538 on Thu Mar 13, 2014 11:32 pm; edited 1 time in total
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AFryia
Joined: 09 Mar 2006
Posts: 965
Location: S.E. Michigan VPH-G70Q
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| Posted: Thu Mar 13, 2014 11:31 pm Post subject: |
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Low power generally.
I have 7x35 Nikon and they are on the edge of being too long with my PJ 12 ft. from the screen.
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CasetheCorvetteman
Joined: 09 Nov 2008
Posts: 6326
Location: Australia
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| Posted: Fri Mar 14, 2014 9:27 am Post subject: |
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Ill have a look at what i have here soon, they can focus at about 1.2 meters.
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Barco Cine 9, ,Sony VPL570ES 4K SXRD, 135" OZ Theatre Majestic 16:9 screen, Denon X6700in preamp mode, 2x 7ch Tonewinner amps, 2x Tonewinner 15" subs, 2x 10" subs, 7.2.6...
RUNCO DTV991 LC ( NEC XG 852 LC ) 100" 4:3 screen, H/K AVR 7.1...
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CasetheCorvetteman
Joined: 09 Nov 2008
Posts: 6326
Location: Australia
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| Posted: Fri Mar 14, 2014 10:40 am Post subject: |
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8x25/6.3° are the specs, minimum focus says 2.5meters, but with my eyes and glasses off i can get it much closer.
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Barco Cine 9, ,Sony VPL570ES 4K SXRD, 135" OZ Theatre Majestic 16:9 screen, Denon X6700in preamp mode, 2x 7ch Tonewinner amps, 2x Tonewinner 15" subs, 2x 10" subs, 7.2.6...
RUNCO DTV991 LC ( NEC XG 852 LC ) 100" 4:3 screen, H/K AVR 7.1...
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416ray4538
Joined: 14 Jul 2009
Posts: 517
Location: near Toronto Ont
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| Posted: Sun Mar 23, 2014 6:27 pm Post subject: |
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| Nashou66 wrote: | Something that can focus close distances. Try a monocular, I think it works better. I can't find mine to get the power of it for you, sorry.
Nashou |
If you happen to find it let me know please.
I'm trying to do it with a bushnell 10-25. I set it so it's focused on the tape marking the centre but not much happens adjusting the barrel.
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When the first clock was invented, how did they know what time to set it to?
No point being pessimistic; it probably would't work anyway.
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AFryia
Joined: 09 Mar 2006
Posts: 965
Location: S.E. Michigan VPH-G70Q
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| Posted: Mon Mar 24, 2014 11:28 pm Post subject: |
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[quote="416ray4538"] | Nashou66 wrote: | | I set it so it's focused on the tape marking the centre but not much happens adjusting the barrel. |
Move the focus knob/barrel slowly the grain will move in and out of focus quickly. Start with the best focus of an internal test pattern. Scan the entire screen; somewhere on the screen there should be grain viable. It is a very subtle grain (color) almost like fine glass beads.
Another tip; use the phosphor grain technique to adjust Scheimpflug too! It won't be perfect like the center but you can move a white card from the screen corners towards the PJ. Adjust lens flapping until the grain shows equal distance from all four corners. Ideally it should land on the screen; unfortunately nothing is perfect.
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Nashou66
Joined: 12 Jan 2007
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Location: West Seneca NY
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416ray4538
Joined: 14 Jul 2009
Posts: 517
Location: near Toronto Ont
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| Posted: Tue Mar 25, 2014 6:22 pm Post subject: |
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"Glas beads" helps. Gives me some idea what I'm looking for.
Thanks
Btw what power mag are you using?
By defocus : Adjust electronic focus to "0"?
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When the first clock was invented, how did they know what time to set it to?
No point being pessimistic; it probably would't work anyway.
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Nashou66
Joined: 12 Jan 2007
Posts: 16171
Location: West Seneca NY
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416ray4538
Joined: 14 Jul 2009
Posts: 517
Location: near Toronto Ont
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| Posted: Sun Apr 20, 2014 10:32 pm Post subject: |
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| AFryia wrote: | Low power generally.
I have 7x35 Nikon and they are on the edge of being too long with my PJ 12 ft. from the screen. |
With 7X mag, you're seeing at 7 ft what you would see at 1 ft just looking ie) no binocs.
So at just under 8" from the screen just with your glasses if you wear glasses or better still nothing if you don't wear glasses, you don't need any binocs.
WTF am I missing here?
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When the first clock was invented, how did they know what time to set it to?
No point being pessimistic; it probably would't work anyway.
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And I will be needing it soon too!!!
