Talk:Optical tracking system for amateur rockets - Revision history

LarryLiang: /* Using C-mout adapter with 35-mm lenses */

2009-05-18T11:33:31Z

Using C-mout adapter with 35-mm lenses

← Older revision		Revision as of 11:33, 18 May 2009
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	I agree, it's a good idea and a 140 mm of '35mm' mount should not be too expensive.		I agree, it's a good idea and a 140 mm of '35mm' mount should not be too expensive.
	--[[User:Keops Leader\|Keops Leader]] 08:22, 14 May 2009 (CDT)		--[[User:Keops Leader\|Keops Leader]] 08:22, 14 May 2009 (CDT)

			The varifocal lens which you are using maybe not a good choice: the image is too soft, lots detail lost. maybe you can try fujinon's 75mm 5 megapixel lens( It should be affordable for this project), it can generate much better image than the existing one. of course, some 35mm lens (with C mount adaptor) is another feasible approach. however, 35 mm lens has lower resolution compared some high resolution 2/3 lens. to compensate such drawback, you may need a much larger Zoom, I mean, maybe 300mm. it could be quite long.--[[User:LarryLiang\|LarryLiang]] 06:33, 18 May 2009 (CDT)

Keops Leader at 13:22, 14 May 2009

2009-05-14T13:22:54Z

← Older revision		Revision as of 13:22, 14 May 2009
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	----		----
	Julien, these adapters do not have any lenses inside, so they do not change the focal length. If you would like to have the "equivalent" of 70*2=140mm for C-mount camera - well, you just need a 35mm f=140mm lens. If you use some popular in France 35mm lens mount - you may easily try different lenses that either you or your friends have --[[User:Andrey.filippov\|Andrey.filippov]] 15:27, 13 May 2009 (CDT)		Julien, these adapters do not have any lenses inside, so they do not change the focal length. If you would like to have the "equivalent" of 70*2=140mm for C-mount camera - well, you just need a 35mm f=140mm lens. If you use some popular in France 35mm lens mount - you may easily try different lenses that either you or your friends have --[[User:Andrey.filippov\|Andrey.filippov]] 15:27, 13 May 2009 (CDT)

			Ok, Andrey, I did not understand the first time the adapter was not a lens.
			I agree, it's a good idea and a 140 mm of '35mm' mount should not be too expensive.
			--[[User:Keops Leader\|Keops Leader]] 08:22, 14 May 2009 (CDT)

Andrey.filippov: /* Using C-mout adapter with 35-mm lenses */

2009-05-13T20:27:20Z

Using C-mout adapter with 35-mm lenses

← Older revision		Revision as of 20:27, 13 May 2009
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	but it's really too expensive and too heavy. Julien		but it's really too expensive and too heavy. Julien
	--[[User:Keops Leader\|Keops Leader]] 13:35, 13 May 2009 (CDT)		--[[User:Keops Leader\|Keops Leader]] 13:35, 13 May 2009 (CDT)


			----
			Julien, these adapters do not have any lenses inside, so they do not change the focal length. If you would like to have the "equivalent" of 70*2=140mm for C-mount camera - well, you just need a 35mm f=140mm lens. If you use some popular in France 35mm lens mount - you may easily try different lenses that either you or your friends have --[[User:Andrey.filippov\|Andrey.filippov]] 15:27, 13 May 2009 (CDT)

Keops Leader at 18:35, 13 May 2009

2009-05-13T18:35:57Z

← Older revision		Revision as of 18:35, 13 May 2009
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	For longer focal length - did you try any of the 35mm lenses with a [http://www.astrovid.com/products.php?subcat=86 C-mount adapter]? I think you can get better image quality than using x2 extender--[[User:Andrey.filippov\|Andrey.filippov]] 08:37, 13 May 2009 (CDT)		For longer focal length - did you try any of the 35mm lenses with a [http://www.astrovid.com/products.php?subcat=86 C-mount adapter]? I think you can get better image quality than using x2 extender--[[User:Andrey.filippov\|Andrey.filippov]] 08:37, 13 May 2009 (CDT)


			Hi Andrey,

			For obtaining an equivalent mount of < 1/2" sensor + 70 mm lens +/- X2 extender >,
			we should use a 380 mm lens for a '35mm'(24x36) sensor,
			ie. if we want the same FoV, we should have the mount : < 1/2" sensor + C-mount adapter(C-'35mm') + 380 mm lens +/- X2 extender(in C or '35mm' format) >
			For a same resolution, this mount has a better quality, it's true,
			but it's really too expensive and too heavy. Julien
			--[[User:Keops Leader\|Keops Leader]] 13:35, 13 May 2009 (CDT)

Andrey.filippov at 13:37, 13 May 2009

2009-05-13T13:37:27Z

← Older revision		Revision as of 13:37, 13 May 2009
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			== CPU-controlled H-bridges ==
	Did you consider using camera CPU to control H-bridges? With 10369 board you can use any of i2c or usb to control the motors. There are several GP I/O going directly to the FPGA available, so you can flip those bits by software initially and then add some FPGA module (i.e. PWM) so these outputs will be run w/o CPU overhead.		Did you consider using camera CPU to control H-bridges? With 10369 board you can use any of i2c or usb to control the motors. There are several GP I/O going directly to the FPGA available, so you can flip those bits by software initially and then add some FPGA module (i.e. PWM) so these outputs will be run w/o CPU overhead.

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	--[[User:TRoll\|TRoll]] 10:43:33, 2009-03-14 (CDT)		--[[User:TRoll\|TRoll]] 10:43:33, 2009-03-14 (CDT)

			== One motor or two motors? ==

	How about just use one motor other than 2 motor? it seems only the tilt movement is critical for tracking, pan movement maybe not necessary for this application. and the burden of micro controller can be half.		How about just use one motor other than 2 motor? it seems only the tilt movement is critical for tracking, pan movement maybe not necessary for this application. and the burden of micro controller can be half.
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	--[[User:Keops_Leader\|Keops Leader]]		--[[User:Keops_Leader\|Keops Leader]]

			== Using C-mout adapter with 35-mm lenses ==

			For longer focal length - did you try any of the 35mm lenses with a [http://www.astrovid.com/products.php?subcat=86 C-mount adapter]? I think you can get better image quality than using x2 extender--[[User:Andrey.filippov\|Andrey.filippov]] 08:37, 13 May 2009 (CDT)

Polto at 18:07, 24 April 2009

2009-04-24T18:07:18Z

← Older revision		Revision as of 18:07, 24 April 2009
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	Hi Larry,		Hi Larry,

	In fact, we will use a 70mm lens (ie FoV about of 5.2x4 deg) with a numeric zoom, ie only a part of ~~CCD~~ and not the full ~~CCD~~.		In fact, we will use a 70mm lens (ie FoV about of 5.2x4 deg) with a numeric zoom, ie only a part of CMOS and not the full CMOS.

	--[[User:Keops_Leader\|Keops Leader]]		--[[User:Keops_Leader\|Keops Leader]]

Keops Leader at 12:37, 24 April 2009

2009-04-24T12:37:38Z

← Older revision		Revision as of 12:37, 24 April 2009
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	An FOV of 2X1.5 deg. means a 160mm lens, it could be quite long and heavy. Larry--[[User:LarryLiang\|LarryLiang]] 06:27, 24 April 2009 (CDT)		An FOV of 2X1.5 deg. means a 160mm lens, it could be quite long and heavy. Larry--[[User:LarryLiang\|LarryLiang]] 06:27, 24 April 2009 (CDT)

			Hi Larry,

			In fact, we will use a 70mm lens (ie FoV about of 5.2x4 deg) with a numeric zoom, ie only a part of CCD and not the full CCD.

			--[[User:Keops_Leader\|Keops Leader]]

LarryLiang at 11:27, 24 April 2009

2009-04-24T11:27:36Z

← Older revision		Revision as of 11:27, 24 April 2009
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	--[[User:TRoll\|TRoll]]		--[[User:TRoll\|TRoll]]

			An FOV of 2X1.5 deg. means a 160mm lens, it could be quite long and heavy. Larry--[[User:LarryLiang\|LarryLiang]] 06:27, 24 April 2009 (CDT)

TRoll at 14:03, 20 April 2009

2009-04-20T14:03:42Z

@@ Line 32: / Line 32: @@
 I'll discuss about this solution with the team.
 --[[User:TRoll|TRoll]] 10:43:33, 2009-03-14 (CDT)
@@ Line 38: / Line 45: @@
 Larry Liang

LarryLiang at 12:15, 18 April 2009

2009-04-18T12:15:21Z

← Older revision		Revision as of 12:15, 18 April 2009
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	--[[User:TRoll\|TRoll]] 10:43:33, 2009-03-14 (CDT)		--[[User:TRoll\|TRoll]] 10:43:33, 2009-03-14 (CDT)

			How about just use one motor other than 2 motor? it seems only the tilt movement is critical for tracking, pan movement maybe not necessary for this application. and the burden of micro controller can be half.

			Larry Liang