Pages: [1]   Go Down

Author Topic: 1.4 TC vs Cropping  (Read 500 times)

rgs

  • Sr. Member
  • ****
  • Offline Offline
  • Posts: 582
    • Richard Smith Photography
1.4 TC vs Cropping
« on: November 08, 2021, 09:57:16 pm »

This should provoke a discussion and, of course, not all circumstances are the same.

For several years, my main camera has been a Canon 7DII. Professionally I do real estate and architectural work, some large musical groups on stage (100+ people), and whatever else might happen along. Personally, I have a longstanding love for landscape photography and a more recent interest in wildlife - particularly birds - that I find one of the most intriguing photographic challenges around. For this, the 7DII has been a generally good choice. For wildlife, I use a Canon 70-300L which has become my favorite lens. On the 7DII, it is usually long enough, the IQ is superb, and it's small enough to fit to go anywhere without extra effort.

Here's where the fun starts. This week, I will be ordering a new Canon R6 that I expect to mostly (but not entirely) replace the 7DII, which will become the backup. The old 50D will be relieved of backup duty and retired to a shelf in my office. But that presents a problem for the 70-300L. It will not be long enough to satisfy me on the R6 - although I expect it will become useful in ways it was not on the 7DII. Since the R6 has only a 20 MP sensor, I am wondering if using a 1.4 TC with it will be a better choice than cropping. The Canon TCs cannot be used with the 70-300L but the Kenkos can. I suspect that the hit to the IQ will be similar with heavy cropping or a TC, but saving some of those MPs may be important. I will probably get one of the new RF 800 f11s soon, but not right away, and don't anticipate being in a position to buy the new RF 100-500L very soon. The f4 500s (and longer) simply don't fit the way I work or the budget.

Sorry this is so long. If you made it this far, please comment. I'd like to see what others think. Thanks.
Logged

stever

  • Sr. Member
  • ****
  • Offline Offline
  • Posts: 1250
Re: 1.4 TC vs Cropping
« Reply #1 on: November 09, 2021, 08:44:18 pm »

there are a couple other options 1) the kenko RF to EF adapter can be filed out to accept the RF 1.4x converter on the R camera (I've done it and it seems to work fine with the 70-200f4 and 100-400 but I haven't done a careful comparison to the to the Canon 1.4x  2) for not a lot more money you can have the RF 100-400 which I find to lose little to the 100-500 in center sharpness and better than expected in the corners - it's a light, compact, lovely handling lens with the benefit of the lens IS communicating with the body IS - and it does surprisingly well with the 1.4x (including AF).  But it's not weather sealed which may be a deal breaker for you.

From personal experience I don't recommend the 3rd party TCs
Logged

rgs

  • Sr. Member
  • ****
  • Offline Offline
  • Posts: 582
    • Richard Smith Photography
Re: 1.4 TC vs Cropping
« Reply #2 on: November 09, 2021, 09:20:50 pm »

I consider the Kenko 1.4 to be a temporary and later infrequent solution. The little 100-400 might be worth a look and the RF 800 (or maybe the 600 if the TC proves unusable) also looks good even if a bit - unorthodox? I am mainly thinking that, in the short term, using the TC may not harm IQ any more than strong cropping while preserving all or most of the sensor data. But then, I could just revert to the 7DII when additional reach is needed.
 
Logged

Paul_Roark

  • Full Member
  • ***
  • Offline Offline
  • Posts: 104
Re: 1.4 TC vs Cropping
« Reply #3 on: November 10, 2021, 10:57:54 am »

The OEM TC I have experience with has rather poor off-axis performance.  I am more inclined to use Topaz's AI Gigapixel to improve the image quality of a cropped frame.

Paul
www.PaulRoark.com
Logged

rgs

  • Sr. Member
  • ****
  • Offline Offline
  • Posts: 582
    • Richard Smith Photography
Re: 1.4 TC vs Cropping
« Reply #4 on: November 10, 2021, 12:19:01 pm »

The OEM TC I have experience with has rather poor off-axis performance.  I am more inclined to use Topaz's AI Gigapixel to improve the image quality of a cropped frame.

Paul
www.PaulRoark.com

Thank you, Paul. Gigapixel is another consideration. I have wondered if the synthesized data might be equal to real data from a TC. The Canon TCs won't work with the 70-300L. The extension bumps into the lens' real element so the Kenko is the only TC option.
Logged
Pages: [1]   Go Up