Interpretation of focal lengths specified

Similar Questions

• astrophotography. I want to know that the focal length is to determine the field of vision?

  I'm interested in astrophotography.  I want to buy a camera for my telescope.  You can find the field of vision, if you know the focal length of the telescope.  But what is the focal length of a camera with a fixed lens?  If I have a 50 mm lens, is the focal distance 50 mm? or do you need to know the distance from the camera of body image sensor and add it to the lens focal length?  Thanks in advance...

  If you have a 50mm... lens focal length.  The focal length is the distance between the end of the lens and the image plane.  If you look at a digital SLR, there is a symbol on the body (usually the top of the body and often near the viewfinder) that looks like a small circle with a line through IT... which line marks the position of the focal plane inside the camera.

  There is a friction more... If you have a 'simple' goal, it would be the focal length.  Many modern lenses are technically able to be physically shorter than the focal length they provide... because of the types of 'glass' and the configuration of optics.  So the focal length is based on how long a simple goal should be to provide that same value (even if you were to physically measure it and not get this value.)

  All telescopes list their focal lengths, but also among the specs of the telescope focal reports.  I have a refractor of 540mm with an opening of 101mm... so it is 'roughly' f/5.4 scope.  I have also a larger 14 "SCT with a focal length of 3556mm and it is a stretch of f/10.

  The distance "flange to focal plane" on a camera Canon is 44 mm... in the grand scheme of things with a telescope, it will not substantially change the focal length of the image.

  Depending on the scope, you can use either a "focal reducer" or a "barlow" to decrease or increase the focal length.

  One last thing... many designs of 'Newtonian' type telescope is problematic for astrophotography.  This is because most of the glasses and catadioptric telescopes are designed with the intention that a person would use a diagonal of 90º with their eyepiece.  "The diagonal has a tendency to add"roughly"2" to the overal of the focal path length.  If you are using a camera you take this "diagonal" and simply attach the camera for a shot "straight through".  So even if you have lost the focal length 2 ", created by the diagonal... the camera adds"roughly"the same amount of back in.

  BUT... When you use a Newtonian telescope of reflector design, the eyepiece is near the front and there is no "diagonal" in use.  This means that when you add a camera, focal length gets longer, it would be with an eyepiece.    Pull door-eyepiece tube has some development trips... but because the camera is the longest focal length, you end up having to run the focuser completely 'in' to shorten the length of the focal length to put the image in focus.  And that's where you are having problems... very often on a Newtonian telescope, you exceed the limit of traction of focuser (you can't shorten the development any more that you have) and the image was just starting to focus... but it's still pretty fuzzy.

  This problem not to poison all the reflectors of knighting... some can accommodate cameras and still come to focus.  You really check the specific scope.

• Script to focal length metadata function

  Hello everyone,

  I'm looking to apply a script on my pictures, which is able to recognize the focal length in the metadata.

  I did a specific series of photo with 3 focal length: 50mm, 70mm and 105 mm and I want to apply a specific script on my photos based on the focal length...

  I hope you can help me

  Best regards

  Change the ActionName and ActionSet in function.

  #target photoshop
  if(documents.length){
  if (ExternalObject.AdobeXMPScript == undefined)  ExternalObject.AdobeXMPScript = new ExternalObject("lib:AdobeXMPScript");
  xmp = new XMPMeta( app.activeDocument.xmpMetadata.rawData );
  if( xmp.doesPropertyExist("http://ns.adobe.com/exif/1.0/", "FocalLength" ) ){
  var fl= xmp.getProperty(XMPConst.NS_EXIF, "FocalLength").toString().match(/^\d+/);
  switch(Number(fl)){
      case  50 : doAction("ActionName","ActionSet"); break;
      case 70 : doAction("ActionName","ActionSet"); break;
      case 105 : doAction("ActionName","ActionSet"); break;
      default : doAction("ActionName","ActionSet"); //any other focal length
      }
  }else{
      //No Focal Length
      doAction("ActionName","ActionSet");
      }
  };
  

• Bad focal length

  Why the metadata display my focal length of my Fujifilm X 20 7.5 mm whereas it should be 28mm

  Because it's the right focal length, the lens on the 2/3 X 20 is zoom 4 x 7.1 - 28, 4 mm, equivalent to 28-112 mm on a 35 mm format

  My X100T has a focal length of 23mm, equivalent to 35mm on a 35mm format

  What you see is the reported correct focal length, not the 35 mm equivalent.

• Is there a way to manually opening of entry and/or the focal length of the lens corrections profile?

  This feature would be very useful for those moments when we shoot with manual glass or use adapters manual or really all cases where metadata is missing or damaged. It is to the correct lens distortions at a specific focal length in the case of the zooms. And manually impute the aperture value would determine how much vignetting correction and chromatic aberration correction is required.

  
  

  Thank you!
  

  This facility is not as much as I know sorry.

• Since the last update when you import images directly into Lightroom, metadata display the correct focal length, but display no information of the lens, Lightroom reports only as "unknown lens", the news of the lens are in meta-data... whe

  Since the last update when importing image directly in Lightroom, metadata display the correct focal length, but will not display any information from the lens, Lightroom reports only as 'unknown lens', the info from the lens is in the meta-data... When you change an image in LR in PS then save, lens Info appears as if by magic. This is a problem of workflow for those who could use multiple lenses on a shoot... What is the status on this issue? I shoot with Nikon D800... thnx ted-lens-metadata-field-missing-on-import?topic-reply-list[settings][filter_by]=company_promo https://feedback.photoshop.com/photoshop_family/topics/camera-raw-9-5-lens-information-aux I posted this on FB with LIGHTROOM page, they instructed me to send you.  Needless to say that it is a huge problem for the workflow, and reduce my bright room isn't an option because whenever he do it takes two days to arrive, and I have no time to lose if I appreciate some type of response as soon as possible

  What is the status on this issue?

  The link you gave clearly indicates the status of this issue. Adobe is working on it.

• The lateset, 2015.5 edition, does not transfer data from the metadata, only the focal length objective. Disappointment when you want to know what that lens you used. (It allows to rename the files but after you create a second copy. "It's an improvement.)

  The last edition, 2015.5, does not transfer data from the metadata, only the focal length objective. Disappointment when you want to know what that lens you used. (It allows to rename the files but after you create a second copy. "It's an improvement.)

  Yes, copied files from Nikon NEF, DNG.

• calculate the field of vision or the focal length of harvest

  Is there a way to do this or a plugin that someone knows?

  (If you have a shot at a 14mm but you crop to the center of it, it would be good to know what is equal to the equivalent focal length of culture)

  Set the Info Overlay to show the new cropped dimensions. In the case the simplest where the aspect ratio of the culture is the same original image, divide one side original by the culture to get the crop factor. If the original is from a full camera frame, the equivalent of 35 mm. long focal length times the crop factor. If the camera has a sensor that is less than 24 x 36 mm, the total of crop factor is crop factor of the camera times the factor of culture "in LR. So, if you have a Canon 7 d, which has a sensor 5184 x 3456 pixels and a factor of 1.6 harvest and crop you the image to 2592 x 1728, the crop factor resulting is 3.2 and your 14 mm lens. will take the field of VISION of a 44.8 mm lens. on a 35 mm camera.. If the harvest of LR has an aspect ratio different that the original, the equivalence is, of course, different for the height and width.

• Is this possible with LR5 to export the EXIF of every photo album (or albums) to an Excel file? My goal is to analyse the focal length I use most

  Is this possible with LR5 to export the EXIF of every photo album (or albums) to an Excel file? My goal is to analyse the focal length I use most. It could be used for various other analysis also

  Therefore change one of your columns in the filter bar to display the focus distance.

  

• [Beginner] How you view focal length of 35mm EQ. ?

  How yo view focal length in 35mm equivalent?

  I found a plugin which sorts the photos in eq. 35mm, but I'm looking for a medium/plug-in that displays focal length in eq. 35 mm in the info of the loop.

  Any other editor of PP I have used in the past were less than LR, but always had the ability to view the focal length in 35mm. I wonder why LR, a far superior tool, is lacking in this Department. Since I still have to learn photography and use the 2 systems of interchangeable lens camera with factors of different cultures and although two compact cameras, through my pictures with the focal length in mind really allows me to get a better understanding of the perspective.

  This plugin can do what you want, but read on:

  http://regex.info/blog/Lightroom-goodies/focal-length-sort

  More than 35 years ago, I bought my first 35 mm SLR film camera and a bunch of privileged (i.e. objectives to single focal length) lenses. I walked with three 3 boxes, each fitted with one (1) 'main' focal lens and a camera with three or more lens bag. Fortunately, the equipment of series Olympus OM I used was extremely, compact and light weight, even by today's standards.

  With ranges of today zoom lens you can cover most tire using only two lenses.

  To "learn the purpose" why not create a spreadsheet containing a list of focal lengths of 35mm (14mm, 16mm, 17mm, 24mm, 28mm, 35mm, etc.) and add a column for each camera with its equivalent focal length model.

  You can then create a group of collections of LR based on the length focus groups for purposes of comparison:

  1.x Crop camera 1 1.x Crop camera 35mm 2

  super wide 14-20mm

  width 21mm - 35 mm

  normal 36mm - 69 mm

  70-299mm telephoto

  Super Telephoto 300mm and more

  Add images from one camera at a time by using the sort column filter bar "Lens" and your impression dandy new handy focal distance calculator spreadsheet.

  It will give you a much better appreciation of what your current hardware can and cannot do. And despite what says Web Weaver, you will never be able to take a picture like that with a 50mm lens:

  

• Missing EXIF focal length

  I'm having this problem in versions 3 and 4. I have a Canon 40 d and all my photos that I edit in LR (uncropped) lack the focal length in the EXIF data.

  This does not happen with Canon DPP. LR will be the focal length in library view, but when he converted to JPG format and then displayed in ZoomBrowser or whatever this piece of program data is missing.

  Windows 7 SP1 x 64, x 64 LR, "reduced data embded" is unchecked as well.

  I'm doing something wrong?

  Photog1982 wrote:

  I'm having this problem in versions 3 and 4. I have a Canon 40 d and all my photos that I edit in LR (uncropped) lack the focal length in the EXIF data.

  This does not happen with Canon DPP. LR will be the focal length in library view, but when he converted to JPG format and then displayed in ZoomBrowser or whatever this piece of program data is missing.

  I can see what you have noticed for a JPG exported from a CR2 from a 5 d Mk II. BUT:

  The focal length is present in the Exif tag, but Canon ZoomBrowser or DPP will not show it. Try using the Windows Photo Viewer and check the properties, you will see the focal length there (as in other programs like IrfanView, ExifTool, etc.). Same distance from the subject (what is no longer displayed in LR3.6 or 4.0) is included in the format of JPEG Exif.

  Beat

• PpiEnableInterrupts returns error "Invalid Length specified"

  I work with IVI VISA PXI plug in modules OR (defined by IVI-6, 3). Almost all of its functionality works perfectly - like module list, attributes and access the memory space, etc... The only problem I got is interruptions. 'PpiEnableInterrupts (__in PpiHandle handle, __in ViUInt16 queueLength)' returns 0xbfff0083 'specified length is invalid error code. " I tried with different values of queueLength... or actually, I did a sweep from 0 to 1024. in all cases, the same error status is returned.

  The material I work with is the following:
  * Chassis: NOR SMU-1071
  * Module system: Ni-SMU-8360
  * Module that I work with the help of the plugin: OR PXI - 6509 (DIO)

  Versions of the software:
  * OR VISA: 5.4
  * NI PXI Platform Services: 4.0
  IVI VISA PXI of the NOR plugin (NiViPpiP.dll & NiViPpiD.dll): 5.4.0.49152

  I know that PXI-6509 generates interrupts...

  Any ideas why PpiEnableInterrupts does not work? Maybe its because the module is PXI SMU not?

  Dear bartek-o,

  I searched our resources to see if we have a better explanation for this error. What I've found, is that it is especially caused by the configuration of the interrupt functionality error.
  Please consult this document: http://www.ni.com/white-paper/3142/en/

  There is a section that says:
  Tip: If you write an instrument driver, let generates interrupts disabled during the initial development phase, even if you plan to implement of the interruptions. It is often useful get the basic functionality of driver before trying to add support for the interruption of work. Interrupt management can be added to the. INF file by running the wizard VISA Driver Development again.

  I suggest that you open VISA Driver Development Wizard and reconfigure the interruptions component generates. It is possible that it is not properly set / and / or not allowed at all.

  Please get back to me if you could try this!

  Best regards

  Peter

• Length specified in pixels. It work?

  Hello
  
  I have a requirement where I need to specify lengths in pixels (fill, column length, line height, font, size etc.). I use fo models for my reports.
  
  When a rtf model is converted to fo, I see most of the pts and not pxls measures. I tried to mention the width in pixels in my model and if it works, the width is not equal to the pixels that I put it in.
  
  IE if I change the attribute padding-left 5px to 10px for a cell, the content is moved to the right by a certain amount, but the shift isn't exactly 5px.
  
  I was wondering if there is no reason why we only use the pts in the models.
  
  All my measurements are taken on an output pdf at 100% zoom.
  
  Pointers, thought that are welcome.
  
  Thanks in advance
  SX

  Hi Sx,

  I think you should read the next section on pixels in xsl. http://www.w3.org/TR/XSL/#pixels

  When I started with xsl, I had the same problems. I could simply not my pixels to fit. I'm and old school-developer web and have always been very fond of using pixels as my unit of measure. Until I started with XSL.

  Because of the problem that you described above, I started to use milimeters (mm) instead. It was really a relief and certainly made my life easier to use pixels. I suggest you think to change your unit of measure.

  Another thing.

  How do you measure the pixels? Do you want to do it directly on the screen, or print you your report?

  Kenneth BR

• How to find exposure, focal length given in 12 items

  Hallo,

  The data for each image (for example canon 6 d, f8, 1/350th etc.) disappeared. It appears on the right side of the screen elements.

  Since arriving at El Captain I have more right click on the mouse which I think has been used to display this info.

  Can someone show me how to find these data?

  Thank you very much

  Roger UK

  In the Organizer 12 PES, click tags/info in the lower right of the Organizer.

  

  Do right click seems to work here on El Capitan with organizer pse 12.

  Using a magic mouse, trackpad, or the classic mouse?

  Is Control click left work?

• Since the update of LR6.5 my lens data no longer appear. I always get the actual focal length, but the name of the lens stopped to appear, which for me is a nuisance!

  Is this likely to be fixed anytime soon?

  Hi Peter,.

  Please see the objective metadata hidden for some photos in Lightroom 2015.5 and 6.5 devices

  Kind regards

  Assani