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I worked with Elie tonight and your support is amazing. She was friendly, patient and knowledgeable. She was able me to better understand the PDFfiller and was able to accomplish what I wanted. Very Pleased with your service and product.
2017-01-27
Saving me so much paper and I'm feeling really positive about my environmental impact. We are in the process submitting our B Corp assessment and this product has highlighted that with some thought you can make small differences
2017-10-06
after years of hunting I finally found…
after years of hunting I finally found a pdf editor that is powerful, easy to use and reasonably priced.
2019-12-26
I was skeptical at first, but eventually got the hang of it. Now, I pleased to say, this is valuable website for filing documents and important papers. Thank you.
2024-06-18
Avis personnel pour une PME
Très belle expérience, que je continue encore à ce jour.
Son aspect ludique, sobre et sophistiqué à la fois, d'un simple logiciel PDF il en devient une ressource majeure pour une entreprise, quel que soit le domaine.
Franchement, je n'en ai pas trouvé, peut être que mon avis n'est pas suffisamment objectif pour répondre honnêtement à cette question.
2023-03-12
I had a billing issue and customer…
I had a billing issue and customer support identified my problem and solved it with ease, no hassle, and immediately. Just good customer support. That makes the entire experience worth it, and the product worth paying for in my opinion.
2022-04-09
I'm 77 with very little computer…
I'm 77 with very little computer skills. I found it easy to use after a few trials and errors. I seem to work for me. Thank you.
2021-09-09
Very pleased with the customer care
I was new to using pdf filler and had a small technical issue with text auto deleting, so I hopped onto the chat where Sam helped fix the issue using screen share via a Zoom call, he kept me informed of what he was doing and the issue was resolved quickly. Sam also took the time to explain to me how to resolve the issue if I ever had it again and was friendly to communicate with, I am very pleased with the customer care, thank you Sam,
2020-09-10
Great customer service and solid product.
I don't usually leave reviews, but this product deserves my time.
Works very well in filling PDFs. Typing, checking boxes (using the checkmark or "x" feature), filling out tables, etc. Saving and editing again works well, though it isn't entirely intuitive the first time.
Customer service was absolutely awesome! I realized, after signing up for a paid subscription, that I no longer needed the service. I cancelled online (or THOUGHT I did), but I must've had a glitch. When I got billed, I called and they issued me a refund no questions asked and zero hassle.
Customer service was incredibly helpful. Product was great for filling out multiple long pdfs that only had slight variations (saved a copy and changed only the fields that I needed). Easy to use and quick to learn.
I cancelled my subscription only because I realized I wouldn't be using it enough to justify the cost. Life changes!
2020-09-01
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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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