Question regarding lenses with aperture range

3 years 9 months ago #690490 by Olivia
I'm thinking about pre ordering a Canon 100-500mm RF f/4.1-7L.  I've not had a variable aperture lense before.  How does this work?  100mm would be f/4.1 and 500mm f/7?  

Can you use a teleconverter on something like this?


Photo Comments
,
3 years 9 months ago - 3 years 9 months ago #690491 by Nikon Shooter

Olivia wrote: How does this work?  100mm would be f/4.1 and 500mm f/7?

Yes, you got that right. These lenses change their morphology
as they zoom in and out and as they focus — they may get im-
pressively longer from one end of the focal range to the other.
And so do not wear the "IF" designation badge showing that
they are neither sealed or resistant.

I prefer to invest in "IF" lenses when available — pricy though.


Olivia wrote: Can you use a teleconverter on something like this?

I don't even use TCs on prime lenses of any length because of
the loss in quality. Being in the publishing industry, quality is a
most important criteria. I've seen that many do… each his own!

Light is free… capturing it is not!
Photo Comments
,
3 years 9 months ago #690496 by Olivia
Well with the TC's you lose just 1 stop of light with each 1.X right?


Photo Comments
,
3 years 9 months ago #690497 by garyrhook
Yes, but that's only part of it. Since a TC isn't integral to the lens, there will be some loss of image quality (IQ). How much is dependent upon the TC's magnification factor, and I believe the lens in question.

My (Nikon) 1.4 II gives me 85%-ish IQ on my 200-500. Not horrible, but noticeable.

You will also want to ensure that your intended TC is compatible with the intended lens. For Nikon, at least, TCs can't be used on just any lens.


Photo Comments
,
3 years 9 months ago - 3 years 9 months ago #690513 by Nikon Shooter

Olivia wrote: Well with the TC's you lose just 1 stop of light with each 1.X right?



Yes but it has to do with the size of the "tube" and not the
magnification factor.


When using Nikon TCs…

a 1.4x teleconverter, you lose 1 stop of light. When using a
f/2.8 lens, the widest effective aperture is ƒ/4

a 1.7x teleconverter, you lose 1½ stops of light, When using 
a f/2.8 lens, the widest effective aperture is f/4.5

a 2x teleconverter, you lose 2 stops of light. When using a
f/2.8 lens, the widest effective aperture is f/5.6.

Light is free… capturing it is not!
Photo Comments
,

817.3K

241K

  • Facebook

    817,251 / Likes

  • Twitter

    241,000 / Followers

  • Google+

    1,620,816 / Followers

Latest Reviews

The Canon EOS R100 is an entry-level mirrorless camera introduced in 2023. But just because it’s an entry-level camera doesn’t mean it’s a bare-bones camera. Find out why in this review!

Apr 22, 2024

Nikon’s retro-looking Nikon Zfc is anything but retro. Under its classic body is a host of features and amenities that make it a worthwhile compact mirrorless camera for 2024.

Apr 15, 2024

The Canon EOS R50 is one of the newest R-system cameras from Canon. Is it worth your money? Find out all the details you need to know in this comprehensive review.

Apr 10, 2024

The Sony FE 70-200mm f/2.8 GM OSS II is Sony’s flagship mirrorless zoom lens. As such, it’s loaded with features and has a top-shelf build quality that makes it a top pick!

Mar 27, 2024
Get 600+ Pro photo lessons for $1

Forum Top Posters

Latest Articles

The Insta360 has one of the best lineups of action cams and 360-degree cameras. With these Insta360 accessories, you can elevate your photography and videography game!

Apr 24, 2024

Creating impactful photos of landscapes depends on many factors, not the least of which is your talent behind the lens. This guide explores other elements required for the best product.

Apr 23, 2024

The Canon EOS R100 is an entry-level mirrorless camera introduced in 2023. But just because it’s an entry-level camera doesn’t mean it’s a bare-bones camera. Find out why in this review!

Apr 22, 2024

Are you ready to upgrade your camera? Before buying new, you might consider the value of purchasing used gear to save money.

Apr 18, 2024

The Olympus OM-D E-M10 Mark IV is a micro four thirds camera released in 2020. It’s an entry-level system along with the OM-D E-M5 Mark III. Use this guide to determine which one is best for you!

Apr 17, 2024

Blue hour photography might not be as well known as golden hour photography, but it is every bit as good a time to create epic images of landscapes. Learn how in this quick tutorial!

Apr 17, 2024

Nikon’s retro-looking Nikon Zfc is anything but retro. Under its classic body is a host of features and amenities that make it a worthwhile compact mirrorless camera for 2024.

Apr 15, 2024

Moving from taking snapshots of your dog to creating beautiful images doesn’t have to be that difficult! Use the tips outlined in this dog photography guide, and you’ll get better results in no time.

Apr 15, 2024