DPReview.com is closing April 10th - Find out more

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

Started 7 months ago | Discussions thread
ThrillaMozilla Veteran Member • Posts: 7,665
Re: M50ii + EF-S 55-250mm STM + Kenko SHQ 1.5x Teleconverter
1

JasonS70 wrote:

I am redrawing my conclusion that there is isn't much of a difference in image quality between converter and non-converter photos. There is a clear difference, to the negative, when using the teleconverter. So for me it is going to be shelved and I will go back to relying on cropping

I don't think you did the test very well.  There is evidence of camera motion or subject motion with the teleconverter.  Look at the reflection of the sun in the eye.

Second, you used different conditions for the two lenses.  For example, you used a longer exposure time with the TC, and this may be one reason for the motion.

I would use a static test target on a sturdy tripod.  For an even comparison you should use exactly the same lens aperture and shutter speed, except double the ISO setting with the TC to compensate for the difference in exposure.  That's how you are going to use the lens, after all -- probably wide open in most cases.  When I say the same aperture, I mean the same aperture diameter.  If you removed the electronics from the TC, that means the same f stop setting.

 ThrillaMozilla's gear list:ThrillaMozilla's gear list
Canon EOS Rebel SL1 Canon EOS M6 II Canon EF 400mm f/5.6L USM
Post (hide subjects) Posted by
MAC
Keyboard shortcuts:
FForum PPrevious NNext WNext unread UUpvote SSubscribe RReply QQuote BBookmark MMy threads
Color scheme? Blue / Yellow