Talk:Entrance Pupil Database - Revision history

Erik Krause: removed some paragraphs that where fixed long time ago

2013-03-17T16:26:55Z

removed some paragraphs that where fixed long time ago

Erik Krause: /* Canon 5d Mark II */ Removed, values are there

2013-03-17T16:25:18Z

‎Canon 5d Mark II: Removed, values are there

Erik Krause: /* Canon 550D */ removed, Values are there

2013-03-17T16:24:09Z

‎Canon 550D: removed, Values are there

Plattro: /* Entrance pupil shift */

2013-03-17T15:12:31Z

‎Entrance pupil shift

Plattro: /* Entrance pupil shift */ new section

2013-03-17T15:10:34Z

‎Entrance pupil shift: new section

Skal: Added a post for Canon 5D mark III

2013-01-09T13:39:47Z

Added a post for Canon 5D mark III

Rosco: /* Canon 550D */ new section

2012-08-02T07:38:47Z

‎Canon 550D: new section

Beeswax: /* Focal Length / # of pics for 360° / Degree between pics */ move section to new article ?

2011-01-29T02:23:27Z

‎Focal Length / # of pics for 360° / Degree between pics: move section to new article ?

Beeswax: /* Tripod Mount Length L1 */ suggestion : refactor L1 and L2 data

2011-01-29T02:17:59Z

‎Tripod Mount Length L1: suggestion : refactor L1 and L2 data

Osiris: /* Sigma 8mm F4.0 EX */

2010-10-04T13:06:59Z

‎Sigma 8mm F4.0 EX

← Older revision		Revision as of 16:26, 17 March 2013
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−	~~I am confused by the terms "horizontal" and "off-axial" adjustment.~~
−
−	~~It seems like they should be "horizontal" and "vertical".~~
−
−	And these depend on camera orientation. The distance between camera base and lens axis is "horizontal" only if the camera is in portrait orientation. In landscape, that same distance is "vertical".
−
−	~~Pictures should make this clear.~~
−
−	~~Perhaps it would be even more clear to refer to these offsets as "basal" and "lateral", or some such.~~
−
−	~~Is there a standard nomenclature for these things? Where is it defined?~~
−
−	~~--Rik~~
−
−	~~------~~
−	~~Rik,~~
−
−	~~I agree with you. Initially I had x, y and z but that would probably be just as arbitrary.~~
−	~~I have not had the time to take pictures of the setup to show what I mean.~~
−	~~The descriptions I had in mind are based on a portrait setup.~~
−
−	~~I am not sure if there are standard definition for it. I was not able to find it.~~
−	~~Any help or suggestions would be helpfull.~~
−
−	~~Richard~~
−	~~------~~
−
	== Number of picture for 360 / Degrees between picture ==		== Number of picture for 360 / Degrees between picture ==

@@ Line 89: / Line 89: @@
 ==Enhance==
 The Entrance pupil database needs constant enhancement. Please enter the NPP-settings you found for your camera.
 == Canon 5d Mark III ==

← Older revision		Revision as of 16:24, 17 March 2013
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	::Thanks for the information and the Graph - this explains a lot. I think it would be good to mention this on the page? Would it be possible/allowed to link to this graph? <small>--[[User:Osiris\|Osiris]] 13:06, 4 October 2010 (UTC)</small>		::Thanks for the information and the Graph - this explains a lot. I think it would be good to mention this on the page? Would it be possible/allowed to link to this graph? <small>--[[User:Osiris\|Osiris]] 13:06, 4 October 2010 (UTC)</small>
−
−	~~== Canon 550D ==~~
−
−	~~Does anyone have the measurements for the Canon 550D / Rebel T2i ?~~

	== Entrance pupil shift ==		== Entrance pupil shift ==

@@ Line 120: / Line 120: @@
 == Entrance pupil shift ==
-A number of lenses show strong entrance pupil shift (See the animations by Pierre Toscani!!)
+A number of lenses show strong entrance pupil shift (See the animations by Pierre Toscani!!) by angle from center.
 The Nikon 10.5 and 16mm fisheye's entrance pupil shifts by around 15mm, the ideal LPP point for panoramas is therefore a bit of a compromise, depending on the amount of image overlap and I don't know what else.
 The Nikon 14mm f2.8D  and other wide angles do this too
 I observe a number of entries for the same lens, (Nikon 10.5mm) probably as a result of this.
 Any comments on how to enter this in the table in the most useful way for most people, but still have the details for the more technically oriented?

← Older revision		Revision as of 15:10, 17 March 2013
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	Does anyone have the measurements for the Canon 550D / Rebel T2i ?		Does anyone have the measurements for the Canon 550D / Rebel T2i ?
		+
		+	== Entrance pupil shift ==
		+
		+	A number of lenses show strong entrance pupil shift (See the animations by Pierre Toscani!!)
		+	The Nikon 10.5 and 16mm fisheye's entrance pupil shifts by around 15mm, the ideal LPP point for panoramas is therefore a bit of a compromise, depending on the amount of image overlap and I don't know what else.
		+	The Nikon 14mm f2.8D and other wide angles do this too
		+
		+	I observe a number of entries for the same lens, (Nikon 10.5mm) probably as a result of this.
		+
		+	Any comments on how to enter this in the table in the most useful way for most people, but still have the details for the more technically oriented?

← Older revision		Revision as of 13:39, 9 January 2013
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	Does anyone have these measurements for the Canon 5d Mark II? -[[User:Dvmorris\|Dvmorris]] 17:29, 11 April 2009 (UTC)		Does anyone have these measurements for the Canon 5d Mark II? -[[User:Dvmorris\|Dvmorris]] 17:29, 11 April 2009 (UTC)
		+
		+	== Canon 5d Mark III ==
		+
		+	Does anyone have tested if Mark II and Mark III are the same? - [[User:Skal\|Skal]] 13:37, 9 January 2013 (UTC)

	==Tables==		==Tables==

← Older revision		Revision as of 07:38, 2 August 2012
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	::Thanks for the information and the Graph - this explains a lot. I think it would be good to mention this on the page? Would it be possible/allowed to link to this graph? <small>--[[User:Osiris\|Osiris]] 13:06, 4 October 2010 (UTC)</small>		::Thanks for the information and the Graph - this explains a lot. I think it would be good to mention this on the page? Would it be possible/allowed to link to this graph? <small>--[[User:Osiris\|Osiris]] 13:06, 4 October 2010 (UTC)</small>
		+
		+	== Canon 550D ==
		+
		+	Does anyone have the measurements for the Canon 550D / Rebel T2i ?

← Older revision		Revision as of 02:23, 29 January 2011
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	:: I will.. when I get time, probably in May. [[User:JX\|JX]] 18:13, 14 April 2008 (CEST)		:: I will.. when I get time, probably in May. [[User:JX\|JX]] 18:13, 14 April 2008 (CEST)
		+
		+	::: Perhaps this "Number of pics for 360°" info deserves its own page/article rather than being appended to the already lengthy "Entrance Pupil Database" ? --[[User:Beeswax\|Beeswax]] 02:23, 29 January 2011 (UTC)

	==Enhance==		==Enhance==

← Older revision		Revision as of 02:17, 29 January 2011
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	Geoff		Geoff
		+
		+	== Tripod mount to NPP : L, L1 and L2. ==
		+
		+	Problem : The list includes a number of "third-party" SLR lenses (Sigma, Tamron, Tokina, Zeiss, etc) which are available with different lens mounts (Nikon F, Canon EF, etc). Each distinct mount system usually has a different flange-back-distance (see http://en.wikipedia.org/wiki/Lens_mount#List_of_lens_mounts), ... which means that the L2 distance for ''nikon-fit'' Sigma 8mm f/4 will be different from the canon-fit version. Where the mount system is not known, this ambiguity renders the current L2 data less than useful.
		+
		+	Proposed solution A : Following the example of http://olypedia.de/Nodalpunkte_E_System let L2 be measured from "NPP to image plane" (ie the sensor or film plane) because - to the best of my knowledge - this will be ''consistent for a given lens regardless of the lens mount system''. Also let L1 be from "tripod screw to image plane".
		+
		+	:Task 1 : Updating L2 data for all the 'known mount' lenses is a simple job : for Canon-EF lenses add 44mm, for the Nikon-Fs add 46.5mm, for Minolta-AF add 44.5mm, etc. For the 'unknown mount' lenses, as I say, the current data is unusable, so no useful data is lost by switching over the image plane measurement system. Perhaps the 'ambiguous' data could be preserved - in the hope of future clarification - in a separate table, possibly here on the discussion page ?
		+
		+	:Task 2 : Updating L1 is simply a matter of subtracting the appropriate FBD from the current L1 value (eg: Nikon D90 = 40mm - 46.5mm = -6.5mm). The instructions for how to measure L1 could be updated to something like "measure from tripod to mount flange and then subtract the appropriate FBD ..." ?
		+
		+	: Task 3 : Data for H and C are unaffected by this change. (That's an easy one!)
		+
		+	: Task 4: Many cameras with fixed-on lenses will also have an exterior image plane marker (circle with a line through it), but IMO it would be easier to have a separate table for fixed-lens cameras which might as well indicate NPP to tripod socket (L) directly.
		+
		+	Comments most welcome! --[[User:Beeswax\|Beeswax]] 02:17, 29 January 2011 (UTC)

	== Focal Length / # of pics for 360° / Degree between pics ==		== Focal Length / # of pics for 360° / Degree between pics ==

← Older revision		Revision as of 13:06, 4 October 2010
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	--[[User:Osiris\|Osiris]] 11:30, 30 September 2010 (UTC)		--[[User:Osiris\|Osiris]] 11:30, 30 September 2010 (UTC)
	:Could well be all of them are right. Fisheyes don't have a single NPP: See [http://michel.thoby.free.fr/Blur_Panorama/Nikkor10-5mm_or_Sigma8mm/Sigma_or_Nikkor/NPP_Sigma_New.jpg this Graph] <small>--[[User:Erik Krause\|Erik Krause]] 18:54, 30 September 2010 (UTC)</small>		:Could well be all of them are right. Fisheyes don't have a single NPP: See [http://michel.thoby.free.fr/Blur_Panorama/Nikkor10-5mm_or_Sigma8mm/Sigma_or_Nikkor/NPP_Sigma_New.jpg this Graph] <small>--[[User:Erik Krause\|Erik Krause]] 18:54, 30 September 2010 (UTC)</small>
		+
		+	::Thanks for the information and the Graph - this explains a lot. I think it would be good to mention this on the page? Would it be possible/allowed to link to this graph? <small>--[[User:Osiris\|Osiris]] 13:06, 4 October 2010 (UTC)</small>