What is a parfocal lens and how beneficial is it to photography?
Aug 16, 2011 · What is a parfocal lens, how is it different from any other lens, and what are the advantages and disadvantages for photography? Would you pay extra for this or prefer it over varifocal?
canon - Are electronically parfocal RF lenses parfocal enough for ...
Dec 2, 2019 · My question is: do the electronically parfocal Canon RF lenses maintain infinity focus well enough for fireworks photography that I can focus to infinity at one focal length (probably the longest) …
Is the Canon EF 24-105mm f/4L IS USM lens parfocal or not?
Jun 23, 2019 · I then zoomed in to 105mm end, and the focus scale was still at 3 meters. So, zooming doesn't affect the focus scale at all (it might affect how autofocus sees things, however). So, is the …
Why do photo cameras lose focus when you zoom, when movie or TV …
Nov 25, 2017 · Anyhow, as it explains, parfocal lenses usually have an independetly moving focus lens group that varifocal lenses lack - usually to keep costs, weight, and/or lens dimensions (as in …
Does a lens exist that is parfocal, has a linear zoom throw, and is ...
Feb 3, 2016 · Parfocal optics. This means that the lens holds focus through the entire zoom range; a videographer can zoom into a subject, focus, and then zoom back out without needing to adjust focus.
If a zoom lens has a distance scale, is it parfocal?
Sep 25, 2017 · The word parfocal just means that a lens (or microscope) doesn't change focus when the zoom setting (focal length) changes. In the case of microscopes, the zoom changes by swapping …
Why are so many kit-lenses parfocal if it's an expensive feature?
According to this answer, parfocal lenses (lenses that can zoom in/out without losing focus) are relatively rare and more expensive. However, the original poster's kit-lens is parfocal. Additiona...
canon - New camera won't focus while zoomed in, old one focuses ...
May 9, 2019 · I take photos of computer hardware for sale on ebay. I had been borrowing a camera for photos (Olympus SZ-16) and the camera will be able to focus while very zoomed in to a device while …
focus - How can I quickly tell without testing if my lens is parfocal ...
I have read a couple of related questions, but I am curious to find out if there is a list of parfocal/varifocal lenses out there. I'm most concerned with the lenses I have and I would like to kno...
What is the focusing mechanism on a Sigma 18-35mm F1.8?
It's not a "true" cinema lens in many respects (it does not offer no focus breathing, it is not parfocal, etc.), but it does have the external controls you seem to want, and it is still about a quarter the cost of a …