M50ii + EF-S 55-250mm STM + Kenko SHQ 1.5x Teleconverter

JasonS70 wrote:

Hi all,

Well after some procrasination I finally followed some advice given on previous posts about modifying my lens to work with the Kenko adapter

The thing I did different is a did not chop up the mount, instead I bought a EF mount replacement part from fleabay that screwed on perfectly. It it well built and has given me no issues

As for the Kenko adapter, taking the chip out so it would work with the lens proved to be fun and games but in the end everything came together and works with not problems. Of course the information about the lens F stop and focal length is not correct but that does not bother me

As for the results I am pretty happy with them, there is a small hit to image quality but with the plethora of software out there today that small hit is more than manageable. Plus for the $100 Aus odd dollars spent who can complain.

So here are some recent examples, of course to get the correct exif data you will need to do some math, I am to lazy

Cheers

Jason

The EF mount part

Nice images! Great job. It is a fun little project for sure.

Welcome to the small but growing club of EF-S 55-250 + teleconverter users. It's a great, light combo.

The back of your EF-S 55-250 IS STM sure looks a lot better than my hacked off mount.

You are correct that the image quality is slightly degraded using the TC, but it's not much and partly due to the fact that the proper lens corrections are not applied in post-processing or in the camera for the combo.

I have found using DxO PhotoLab 5 that setting the global sharpening to about 30-50, maxing out the CA corrections including enabling purple fringing correction, and using an unsharp mask with intensity 25-50, Radius 0.91, and threshold zero will yeild results that look very much like the lens without the teleconverter, they will be pretty sharp at the pixel level. Also using Deep prime de-noise even at low ISOs seems to always give a cleaner, sharper image... for low ISOs a low value of 10-25 is often about right.

For other post-processing software, applying a little more sharpning and more CA correction should help.

For those who might be interested in this conversion, here is a link to a past thread where this was discussed a bit, and the posts have links to other threads where I detail how to remove the chip from the Kenko 1.5x SHQ teleconverter.

https://www.dpreview.com/forums/post/65817791