Tonight's Moon

Ishtim · 3rd Jan 2006, 08:23 AM

Just a pic...

Chai · 3rd Jan 2006, 08:53 AM

Looks a bit soft though, but still

Adrian Wong · 6th Jan 2006, 03:46 AM

Maybe we should have a moon shot competition.

But I think possibly only Ken and Ishtim will be able to take such pics.

Ishtim · 12th Jan 2006, 12:49 PM

Last night's... focused this time with Ronchi Screen...

Adrian Wong · 12th Jan 2006, 02:10 PM

Hmm.. Did a Google search. A Ronchi screen is just a piece of glass with many lines to aid in focusing, right?

This link has some explanation, but I'm not entirely sure how it works...

Link - http://www.astropix.com/HTML/I_ASTRO...0816/I0816.HTM

Is it like wearing spectacles with the glass replaced with a fine plastic mesh? That sort of corrects the focus.

Ishtim · 12th Jan 2006, 09:36 PM

The Ronchi screen makes lines appear by diffraction. When way out of focus, you see alot of lines. As proper focus is approached the lines become farther apart and eventually "disappear" once perfect focus is achieved.

To contrast this, the soft image at the top of this thread was focused by "eyeball" and guessing.

Adrian Wong · 14th Jan 2006, 01:37 AM

Oh, so it helps by telling you when the image is in perfect focus?

Yeah, I can see how that would be useful.

3rd Jan 2006, 08:23 AM	#1 (permalink)
Ishtim Super Moderator Join Date: 14 May 2003 Location: Alabama, USA Posts: 3,765 Reputation: 3333 Rep Power: 43	Tonight's Moon Just a pic... Attached Thumbnails

3rd Jan 2006, 08:53 AM	#2 (permalink)
Chai Administrator Join Date: 6 Oct 2002 Location: Maranello Posts: 27,884 Reputation: 4630 Rep Power: 81	Looks a bit soft though, but still __________________ Chai (Contributor & Forum Admin) http://www.techarp.com/

6th Jan 2006, 03:46 AM	#3 (permalink)
Adrian Wong Da Boss Join Date: 10 Oct 2002 Location: In front of my ASUS F8V notebook! Posts: 32,304 Reputation: 3574 Rep Power: 75	Maybe we should have a moon shot competition. But I think possibly only Ken and Ishtim will be able to take such pics. __________________ Dr. Adrian Wong Tech ARP \| Blog @ Tech ARP \| The Free Trade Zone DYKT : The only offshore account I have is at the sand bank? We need PROGRAMMERS and TECHNICAL WRITERS! Contact us if you are a hot shot programmer or technical writer! My items for sale : 50x SD Card \| Memory Stick PRO \| Cyclone Energy Saver \| Seiko SS watch \| Tiger/Carlsberg beer jugs \| Travel Speakers \| Motorola V600 \| Nokia N90 SOLD! \| New Lowepro Mini Trekker AW Other items for sale @ the FTZ : Zalman CNPS9500 LED @ $20 \| Zalman CNPS7700 Cu @ $20 \| Zalman CNPS7000 Cu @ $20 \| Swarovski bracelet watches \| Dell 17" LCD \| Hi-Fi speakers \| English DIVX movies \| HP LaserJet toners! \| Office chairs

12th Jan 2006, 12:49 PM	#4 (permalink)
Ishtim Super Moderator Join Date: 14 May 2003 Location: Alabama, USA Posts: 3,765 Reputation: 3333 Rep Power: 43	Last night's... focused this time with Ronchi Screen... Attached Thumbnails

12th Jan 2006, 02:10 PM	#5 (permalink)
Adrian Wong Da Boss Join Date: 10 Oct 2002 Location: In front of my ASUS F8V notebook! Posts: 32,304 Reputation: 3574 Rep Power: 75	Hmm.. Did a Google search. A Ronchi screen is just a piece of glass with many lines to aid in focusing, right? This link has some explanation, but I'm not entirely sure how it works... Link - http://www.astropix.com/HTML/I_ASTRO...0816/I0816.HTM Is it like wearing spectacles with the glass replaced with a fine plastic mesh? That sort of corrects the focus. __________________ Dr. Adrian Wong Tech ARP \| Blog @ Tech ARP \| The Free Trade Zone DYKT : The only offshore account I have is at the sand bank? We need PROGRAMMERS and TECHNICAL WRITERS! Contact us if you are a hot shot programmer or technical writer! My items for sale : 50x SD Card \| Memory Stick PRO \| Cyclone Energy Saver \| Seiko SS watch \| Tiger/Carlsberg beer jugs \| Travel Speakers \| Motorola V600 \| Nokia N90 SOLD! \| New Lowepro Mini Trekker AW Other items for sale @ the FTZ : Zalman CNPS9500 LED @ $20 \| Zalman CNPS7700 Cu @ $20 \| Zalman CNPS7000 Cu @ $20 \| Swarovski bracelet watches \| Dell 17" LCD \| Hi-Fi speakers \| English DIVX movies \| HP LaserJet toners! \| Office chairs

12th Jan 2006, 09:36 PM	#6 (permalink)
Ishtim Super Moderator Join Date: 14 May 2003 Location: Alabama, USA Posts: 3,765 Reputation: 3333 Rep Power: 43	The Ronchi screen makes lines appear by diffraction. When way out of focus, you see alot of lines. As proper focus is approached the lines become farther apart and eventually "disappear" once perfect focus is achieved. To contrast this, the soft image at the top of this thread was focused by "eyeball" and guessing.

14th Jan 2006, 01:37 AM	#7 (permalink)
Adrian Wong Da Boss Join Date: 10 Oct 2002 Location: In front of my ASUS F8V notebook! Posts: 32,304 Reputation: 3574 Rep Power: 75	Oh, so it helps by telling you when the image is in perfect focus? Yeah, I can see how that would be useful. __________________ Dr. Adrian Wong Tech ARP \| Blog @ Tech ARP \| The Free Trade Zone DYKT : The only offshore account I have is at the sand bank? We need PROGRAMMERS and TECHNICAL WRITERS! Contact us if you are a hot shot programmer or technical writer! My items for sale : 50x SD Card \| Memory Stick PRO \| Cyclone Energy Saver \| Seiko SS watch \| Tiger/Carlsberg beer jugs \| Travel Speakers \| Motorola V600 \| Nokia N90 SOLD! \| New Lowepro Mini Trekker AW Other items for sale @ the FTZ : Zalman CNPS9500 LED @ $20 \| Zalman CNPS7700 Cu @ $20 \| Zalman CNPS7000 Cu @ $20 \| Swarovski bracelet watches \| Dell 17" LCD \| Hi-Fi speakers \| English DIVX movies \| HP LaserJet toners! \| Office chairs