JonathanChemE

I just got my used Kenko TELEPLUS Pro 300 DG 1.4X Teleconverter for Canon EF Mount from KEH. I am using it with my T7i and Canon EF 70-300mm f/4-5.6 IS USM Lens. I want to report that the auto focus worked great with the combo at 300mm. I just need to get used to keeping the camera steady at that effective focal length but I have gotten some good non-blurry test shots at fast shutter speeds and 3200 ISO. I will see how it works in the field with some real shots using my monopod. My main focus is wildlife, mostly birds. I will report back after I get some nice colorful shots and process them in Affinity. I was considering getting Topaz Denoise but I am not sure that it will work on my MacBook. After I take my next field trip I may download the trial. Any experience using Topaz Denois on a MacBook Pro 2015? At this point I am not wanting to spend ~$1500 on a new computer just to get a better denoise function. Any tips on using the denoise in Affinity?

imagemeister Loc: mid east Florida

This is valuable info. ....thanks for posting. I have a 70-300 IS II nano and tried a third party1.4X with it on a 80D and NO AF. ....8-(

Notorious T.O.D. Loc: Harrisburg, North Carolina

How many focus points function at f/8 on your 80D? I would think at least the center one would...

Richard Engelmann Loc: Boulder, Colorado

The information I see for this adapter states that it is for f4 or brighter. So, are you getting good results at f 5.6 at 300mm? If so, I will rush to buy one.

imagemeister Loc: mid east Florida

It depends on the exact lens and the exact TC - I had assumed after it failed for me that the TC HAD to be a Canon to communicate properly ......yes, at least the center point SHOULD .... but with the "right" lens and TC, 9 are possible.
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chelduser

I have a Teleconverter and rarely use it. I think I will take it out and experiment. Thanks for reminding me of a nice piece of equipment I already have.

Mark Sturtevant Loc: Grand Blanc, MI

Have fun with the new toy.
Before you go with a commercial software product, you might consider looking at what the free ones can do for you. Gimp (free) can be used with the G'Mic plugins (also free), and the several denoise filters in there simply do the job for me. Also RawTherapee (free), for Raw format pictures has amazing denoise functions (you could write a book about all the different ways it does that alone), although that program has a significant learning curve. There are excellent tutorials online on YooToob. I've not had much reason to use commercial software at all, come to think of it.

amfoto1 Loc: San Jose, Calif. USA

In the last 10 or 15 years there have been five different Kenko 1.4X teleconverters for Canon. Two are currently offered.

Teleplus Pro 300 1.4X DG... discontinued, oldest version I'm familiar with, but haven't used personally. EF lenses only. No longer listed on Kenko website.

Teleplus Pro 300 1.4X DGX... discontinued, electronics revised from the first version, overall good image quality, recommended for full frame. EF lenses only. (https://kenkoglobal.com/product/teleplus_pro_300_1_4x_dgx/]

Teleplus MC-4 1.4X DGX... discontinued, a less expensive variant that's actually the sharpest of the bunch at the center, but not as sharp in the corners. Recommended for APS-C cameras. Usable on EF lenses only. Archived info: [url](https://kenkoglobal.com/product/teleplus_mc4_af_1_4x_dgx/)

Teleplus HD 1.4X DGX... current model with revised optical formula, more expensive than any of the previous models, this and the HD Pro are the only teleconverters anyone makes that can be fitted to both EF and EF-S lenses. There really aren't many EF-S lenses that it makes sense to use with a teleconverter (maybe the 55-250mm or 18-135mm). Note: Canon's own teleconverters cannot be used with EF-S lenses (and have many other limitations due to their protruding front elements that have to fit inside the rear barrel of a lens). https://kenkoglobal.com/product/teleplus_hd_1_4x_dgx/

Teleplus HD Pro 1.4X DGX... current premium model. Other than a more complex optical formula and exterior finish, I don't know how it differs from the non "Pro" version. Also usable with both EF and EF-S lenses.[url]https://kenkoglobal.com/product/teleplus_hd_pro_1_4x_dgx/[/b]

In their documentation, Kenko states that the teleconverters are only compatible with Canon and Tokina lenses, incompatible with other brands. They also state that the 1.4X are only usable with f/4 lenses (and their 2X are only compatible with f/2.8 lenses).

All this is just Kenko covering their bases. "Don't blame us if something doesn't work!". It's virtually impossible to test every combination of lens, teleconverter and camera. There are just way too many possible combinations. They have tested most current Canon lens compatibility, as well as current and recent Tokina (which is part of the same company as Kenko... and Hoya). The same is true of the lens max aperture.... they say f/4 lenses because some Canon cameras don't support f/8 lens/TC combos. Many do now, but some current and many older models don't. I think Kenko also covers their bases by telling you to turn off image stabilization, automatic lens correction and any micro focus adjustment (MFA). I can see where there won't be a lens profile in the camera for auto corrections (vignetting, distortion, chromatic aberration, etc.). But it doesn't make sense that IS needs to be turned off. MFA should be usable, too. (MFA should be done for any specific lens/TC combo. MFA for the lens alone wouldn't apply.)

All the Canon 45-point AF systems (1st seen in 80D, also in 77D, T7i, T8i, 90D, 6D Mark II) are "f/8 capable" at one or more points. In all cases, the center AF point alone is usable with an f/8 lens/TC combo.

In a few very specific combos, up to 27 of the AF points can be used. The only combo I know of that works with 27 is the Canon EF 100-400mm II lens with the Canon 1.4X III teleconverter. Supposedly there are some others that don't allow 27 points, but do allow more than 1 to be used. I don't know what those are.

JonathanChemE

The T7i can focus down to f/8. Still I wasn't sure that it would work but it does.

madpaddler Loc: Near Seattle, Washington

I own one of the first KENKO C-AF 1.4x Teleplus Pro 300. The auto-focus works on both my 6D mk II & 5D mk II with all of my Canon lenses (f/2.8 zooms and 50mm prime f/1.4) and one (1) Tamron zoom lens, (the 28-300 f/3.5-63). However, auto-focus will not work on my Tamron 150mm-600mm G2, which limits this manual-focus mode. I have never used this Teleconverter on the 150-600mm G2 as it gives me all the reach I need without it.