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I was upset about a billing issue. Customer service reached out to me immediately and had my issue resolved in a very short period of time. I appreciate the way they handled it and followed up with me. Great customer service!
2014-05-09
I was looking for a PDF filler software that would be easy to use, fast and reliable. PDF filler is the best online tool to fill out, edit, and easily access from dropbox, email or just uploading which makes accessing your PDF documents a walk in the park. I am A Brisbane guy from Australia and I recommend this program to anyone who wants to edit thier PDF documents.
2014-08-28
I had an initial difficult time getting use to the program. I have now fine tuned the functions and have accessed the benefits. The support online was informative and patient with my frustrations. I will recommend this program to my clients and co-workers. The cost is reasonable.
2016-01-27
Good utility but service was even better
I used this a couple of times. It was good, but other than that specific task I had no use of it, I let the trial run out and a week after I was charged and they were gracious enough to give me a refund and cancel the subscription with no fuss. Greatly appreciated.
2020-03-25
pdfFiller Review
Overall, PDFfiller is an excellent solution for digital signature, document management, and PDF editing needs. I highly recommend this platform for any user looking for a reliable and convenient solution to work with PDF documents.
PDFfiller is an excellent online platform that I really enjoyed using for its features of digital signature, document management, and PDF editing. I used this platform for more than a year and I was impressed with its ease of use and the speed of its features.
The negative aspect that I noticed on PDFfiller is that it is not always easy to find advanced editing options, especially for beginner users. This can lead to some frustration at the beginning, but once you get familiar with the interface, it becomes much easier to use.
2023-02-17
A life saver
pdfFiller has helped me to make easier my load of work and without I might be stressing a lot.
What I like most about this software is the ease of use, as an educator I need to use PDF's everyday and this software helps me a lot with that.
The free trial is good but then you need to pay for another features.
2022-11-13
This made filing my documents SOOO much…
This made filing my documents SOOO much easier! It also looks so much more professional than handwriting or typing in. Was so happy to find this.
2020-09-11
Great customer experience with this company. Very responsive to technical questions and billing service cared more about our satisfaction than most companies even though it wasn't to their direct bottom line advantage. Will use them again surely.
2020-06-10
Good
Good, but would be better if the cursor would line up exactly on each line with the line above. It's frustrating to have to manually line it up every time.
2020-05-29
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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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