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What our customers say about pdfFiller
See for yourself by reading reviews on the most popular resources:
So far so good. I don't know why when I add pictures it doesn't come through in the email. Plus, I don't know how to edit a form once I've completed it.
2014-07-01
I was annoyed that I had to enter credit card info for a free trial. It makes me feel as if I'm being tricked into keeping your service. Very pleased with how the product works though.
2019-05-07
Customer Service Is Great
I used this service while at work and as a functional feature it is great, does what one needs it to do. However, as sometimes happens, I needed to charge this to my personal banking account at the time. When I left the company, I contacted their customer services team via their web based chat service and a kind lady named Monica answered my query. She was very helpful, diligent in helping me locate my details, and took her time to reassure me that the service subscription had ended and evening was a-ok. I know if I ever need to use this service I will come back, and part of the reason is because the customer care was absolutely spot on. Would recommend.
2020-04-17
I had an issue that customer service…
I had an issue that customer service handled quickly and professionally. I was very impressed! I highly recommend working with this company they have excellent customer service.
2020-01-17
Makes My Job Easy
I use PDFfiller to create contracts and purchase orders. For contracts, I typically input data into Excel, and then use PDFfiller to create the finished contract from my Excel data. For purchase orders, I use PDFfiller to edit document information, highlight items, and sign the document. This saves me the hassle of having to print out documents, edit them by hand, and then scan/fax them. Very happy with PDFfiller, as it most certainly makes my job easier.
PDFfiller has all the features that I need for my documents: adding a logo, highlighting, and drawing. I also think that it's great how you can seamlessly use Excel data to fill out forms automatically. This is especially helpful when creating contracts.
The price is a little steep for what I see as somewhat of a basic software concept; however, it's worth it in my opinion. There is also a decent learning curve, but once you get the hang of all features, you can automate things and fill out your PDFs very quickly.
2018-10-14
Refund amount was authorized on a…
Refund amount was authorized on a timely matter without hassle. I was not easily able to unsubscribe when accessing my account directly through my google account.
2024-10-04
Very helpful for merging and deleting un needed pages in documents! Only issue is loosing the ability for the fillable spaces I created when I upload.
2023-02-02
Very easy to use
Very easy to use. Strongly reaccommodated.
Free subscription is strong enough to support most pdf editing requirement. Happy to upgrade for pay subscription once need more powerful features.
2022-10-15
This app is a life saver
This app is a life saver, it has saved me so much money and time by not having to print, a document, fill out the document and then fax it back.
2022-01-22
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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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