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What our customers say about pdfFiller
See for yourself by reading reviews on the most popular resources:
exceptionally easy to use, perfect for editing PDF forms which are otherwise impossible to edit, makes life all that much easier, and best of all everything is legible - awesome
2016-03-21
I can't verify that my completed forms are actually sent to recipients. Programs keeps requesting me to have my e-mail verified but no code is ever sent to my e-mail.
2017-12-16
good product. but pricing was not clear i subscribed to one year one time payment when i wanted the pay as you go per moth option. hope to get it resolved soon. or will cancel fully.
2018-01-09
I cut off the bottom part of the document. I'm trying a reprint, now and will select "fit to page" on my printer preferences to see if that works.
2018-03-19
The "Draw" tool needs to have an option to match the color on the picture or PDF page so when you're drawing you don't mess up your picture so bad!
2019-01-15
I'm learning how to use the program. We need it for online school for our granddaughter
It is a bit complicated. As we learn to print and save and figure out which document it which, it will be easier to use
2019-11-13
Very happy with the product
Very happy with the product, I used trial version to promote it within the company, simply amazing, thanks team.Best regards,Juan Soto
2019-12-23
I've never had a tantrum using it...It makes my day much easier and saves me time and money!
I enjoy using PDF Filler. It is a valuable asset to my business. I'm able to sign, send and receive documents, receipts, invoices, you name it! They have a form for everything, and if they don't, they will find one for you!! This program is easy to use and I love how there is a record kept of everything I send.
I don't know how to re-use a form over and over without having to delete whats on it , so I can use it again. I wish there was an option to use a new one!!
2017-11-14
At the first, i had some problems with using the application but later on, I learned how to use it, still, I need further study to be more familiar with it
2023-02-06
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What is diffraction limited resolution?
An optical system with the ability to produce images with angular resolution as good as the instrument's theoretical limit is said to be diffraction limited. The resolution of a given instrument is proportional to the size of its objective, and inversely proportional to the wavelength of the light being observed.
What is meant by the diffraction limited resolution of a telescope?
angular resolution. Ability of a telescope to distinguish between adjacent objects in the sky. Diffraction-limited resolution. Theoretical resolution that a telescope can have due to diffraction of light at the telescope's aperture. Depends on the wavelength of radiation and the diameter of the telescope's mirror.
What is the diffraction limit of a telescope?
What is the diffraction limit of a telescope? The minimum angular separation of two sources that can be distinguished by a telescope depends on the wavelength of the light being observed and the diameter of the telescope. This angle is called the DIFFRACTION LIMIT. In this equation, the computed angle is in radians.
What is meant by resolution of a telescope?
The angular resolving power (or resolution) of a telescope is the smallest angle between close objects that can be seen clearly to be separate. Resolution is limited by the wave nature of light.
What does diffraction limited mean?
Diffraction limit means that an imaging lens could not resolve two adjacent objects located closer than /2NA, where is the wavelength of light and NA is the numerical aperture of the lens. E.g. the resolution of optical imaging instruments, is fundamentally limited by the diffraction of light.
How does diffraction affect resolution?
Diffraction causes points of light which are close together to blur into a single spot: it sets a limit on the resolution with which one can see. If the light passes through a circular aperture.
Why do you think this limit of resolution is described as diffraction limited?
There are many situations in which diffraction limits the resolution. The acuity of our vision is limited because light passes through the pupil, the circular aperture of our eye. Be aware that the diffraction-like spreading of light is due to the limited diameter of a light beam, not the interaction with an aperture.
What does it mean to be diffraction limited?
An optical system with the ability to produce images with angular resolution as good as the instrument's theoretical limit is said to be diffraction limited. The resolution of a given instrument is proportional to the size of its objective, and inversely proportional to the wavelength of the light being observed.
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