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#1
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Lens focus adjustments
What does everyone one do for fine in-camera adjustments for
individual lenses? I see that Datacolor and LensAlign have kits, but they are pricey for what you get. Anyone know of cheaper alternatives? I know you can make these, but I'd rather just buy something. Or does anyone have a really simple DIY method to make one? Too many of my photos have serious focus issues, and I'm trying to figure out the reason. It can't all be bad glass. |
#2
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Lens focus adjustments
On Wed, 07 Jan 2015 17:57:25 -0800, Bill W
wrote: What does everyone one do for fine in-camera adjustments for individual lenses? I see that Datacolor and LensAlign have kits, but they are pricey for what you get. Anyone know of cheaper alternatives? I know you can make these, but I'd rather just buy something. Or does anyone have a really simple DIY method to make one? Too many of my photos have serious focus issues, and I'm trying to figure out the reason. It can't all be bad glass. This might help you https://dl.dropboxusercontent.com/u/...tChardOnly.jpg -- Regards, Eric Stevens |
#3
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Lens focus adjustments
On 2015-01-08 01:57:25 +0000, Bill W said:
What does everyone one do for fine in-camera adjustments for individual lenses? I see that Datacolor and LensAlign have kits, but they are pricey for what you get. Anyone know of cheaper alternatives? I know you can make these, but I'd rather just buy something. Or does anyone have a really simple DIY method to make one? Too many of my photos have serious focus issues, and I'm trying to figure out the reason. It can't all be bad glass. If you really don't wan't to buy a LensAlign, head for your local Home Depot, Lowes, or OSH and buy a yard or meter stick. That should be the basis for your tool. Using one of those you won't have to bother with measuring a target track.Next make a set of three focus targets, one for placement at the distance from the lens where the focus should be good. Then you want one you can adjust away from the primary focus target, and one you can adjust towards the camera. That should give you a basic set up. Also check: http://www.steves-digicams.com/knowledge-center/how-tos/troubleshooting-repair/digital-camera-how-to-perform-your-own-lens-calibration.html#b or http://tinyurl.com/k5l5p4m and http://petapixel.com/2013/03/12/ghettoca-a-diy-lens-calibration-tool-for-micro-adjustment-enabled-dslrs/ http://tinyurl.com/lqxs4lc -- Regards, Savageduck |
#4
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Lens focus adjustments
Eric Stevens wrote:
On Wed, 07 Jan 2015 17:57:25 -0800, Bill W wrote: What does everyone one do for fine in-camera adjustments for individual lenses? I see that Datacolor and LensAlign have kits, but they are pricey for what you get. Anyone know of cheaper alternatives? I know you can make these, but I'd rather just buy something. Or does anyone have a really simple DIY method to make one? Too many of my photos have serious focus issues, and I'm trying to figure out the reason. It can't all be bad glass. This might help you https://dl.dropboxusercontent.com/u/...tChardOnly.jpg Hi, That is very helpful, so thanks. Years ago, for some reason, the U.S. Government Printing Office issued various photo focus targets, both high and low contrast, printed on fine paper stock,at the very low price of $3.-. It is dated June 1973, and the number is NBS SP-374. I remember how useful they were, including equivalents for how many lines per millimeter were sharp = pairs seen as pairs and not one line. The lines were printed with a raised technique, like fine stationery, so that you could actually feel them. Mort Linder --- This email has been checked for viruses by Avast antivirus software. http://www.avast.com |
#5
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Lens focus adjustments
Hi,
In the old days of no money, we used to tape a newspaper page to a flat wall, then photograph it from a 45 degree angle, with the focus on an X drawn onto the page. By looking at the negative or slide, you could readily see if the focus was correct or off, and if off in which direction and by how much. What is cheaper as a test than a newspaper page? Mort Linder Savageduck wrote: On 2015-01-08 01:57:25 +0000, Bill W said: What does everyone one do for fine in-camera adjustments for individual lenses? I see that Datacolor and LensAlign have kits, but they are pricey for what you get. Anyone know of cheaper alternatives? I know you can make these, but I'd rather just buy something. Or does anyone have a really simple DIY method to make one? Too many of my photos have serious focus issues, and I'm trying to figure out the reason. It can't all be bad glass. If you really don't wan't to buy a LensAlign, head for your local Home Depot, Lowes, or OSH and buy a yard or meter stick. That should be the basis for your tool. Using one of those you won't have to bother with measuring a target track.Next make a set of three focus targets, one for placement at the distance from the lens where the focus should be good. Then you want one you can adjust away from the primary focus target, and one you can adjust towards the camera. That should give you a basic set up. Also check: http://www.steves-digicams.com/knowledge-center/how-tos/troubleshooting-repair/digital-camera-how-to-perform-your-own-lens-calibration.html#b or http://tinyurl.com/k5l5p4m and http://petapixel.com/2013/03/12/ghettoca-a-diy-lens-calibration-tool-for-micro-adjustment-enabled-dslrs/ http://tinyurl.com/lqxs4lc --- This email has been checked for viruses by Avast antivirus software. http://www.avast.com |
#6
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Lens focus adjustments
"Bill W" wrote in message
news What does everyone one do for fine in-camera adjustments for individual lenses? I see that Datacolor and LensAlign have kits, but they are pricey for what you get. Anyone know of cheaper alternatives? I know you can make these, but I'd rather just buy something. Or does anyone have a really simple DIY method to make one? Too many of my photos have serious focus issues, and I'm trying to figure out the reason. It can't all be bad glass. With the use of a focus chart like Eric posted, I found the "Dot Tune" method to work very well. http://www.fredmiranda.com/forum/topic/1187247 |
#7
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Lens focus adjustments
On Wed, 07 Jan 2015 21:35:03 -0500, Mort wrote:
Hi, Hi In the old days of no money, we used to tape a newspaper page to a flat wall, then photograph it from a 45 degree angle, with the focus on an X drawn onto the page. By looking at the negative or slide, you could readily see if the focus was correct or off, and if off in which direction and by how much. What is cheaper as a test than a newspaper page? For focus accuracy, you should focus on a high contrast object that is PARALLEL to the sensor. Those AF points are bigger than depicted. If the target is at 45 deg, then the AF point may focus on the part of the target that is closest to the camera, thus front-focusing a bit. W --- This email has been checked for viruses by Avast antivirus software. http://www.avast.com |
#8
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Lens focus adjustments
On 1/8/2015 12:23 PM, Wally wrote:
On Wed, 07 Jan 2015 21:35:03 -0500, Mort wrote: Hi, Hi In the old days of no money, we used to tape a newspaper page to a flat wall, then photograph it from a 45 degree angle, with the focus on an X drawn onto the page. By looking at the negative or slide, you could readily see if the focus was correct or off, and if off in which direction and by how much. What is cheaper as a test than a newspaper page? For focus accuracy, you should focus on a high contrast object that is PARALLEL to the sensor. Those AF points are bigger than depicted. If the target is at 45 deg, then the AF point may focus on the part of the target that is closest to the camera, thus front-focusing a bit. W With the exception of certain types of pohotgraphy, such as forensic & scientific, it is rare that the focus plane is exactly parallel to the focal plane. -- PeterN |
#9
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Lens focus adjustments
On Thu, 08 Jan 2015 17:38:32 -0500, PeterN wrote:
On 1/8/2015 12:23 PM, Wally wrote: On Wed, 07 Jan 2015 21:35:03 -0500, Mort wrote: Hi, Hi In the old days of no money, we used to tape a newspaper page to a flat wall, then photograph it from a 45 degree angle, with the focus on an X drawn onto the page. By looking at the negative or slide, you could readily see if the focus was correct or off, and if off in which direction and by how much. What is cheaper as a test than a newspaper page? For focus accuracy, you should focus on a high contrast object that is PARALLEL to the sensor. Those AF points are bigger than depicted. If the target is at 45 deg, then the AF point may focus on the part of the target that is closest to the camera, thus front-focusing a bit. W With the exception of certain types of pohotgraphy, such as forensic & scientific, it is rare that the focus plane is exactly parallel to the focal plane. Having spent 30+ years doing forensic photography I can say that I cannot recall a single occasion when I have had to set up the camera so that the image plane is parallel to the object plane. There have been occasions when it might have been useful but, when needed, I have always had software to correct errors in parallelism. -- Regards, Eric Stevens |
#10
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Lens focus adjustments
In article , Eric Stevens wrote:
Wally: For focus accuracy, you should focus on a high contrast object that is PARALLEL to the sensor. Those AF points are bigger than depicted. If the target is at 45 deg, then the AF point may focus on the part of the target that is closest to the camera, thus front-focusing a bit. PeterN: With the exception of certain types of pohotgraphy, such as forensic & scientific, it is rare that the focus plane is exactly parallel to the focal plane. Having spent 30+ years doing forensic photography I can say that I cannot recall a single occasion when I have had to set up the camera so that the image plane is parallel to the object plane. There have been occasions when it might have been useful but, when needed, I have always had software to correct errors in parallelism. -- Talk about missing the point... -- Sandman[.net] |
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