Really nice weather today, almost 80 degrees here in Chicago and some not overly bright conditions, so I set off to do some more testing on the extenders.
Below is the BTS setup, same as last time as far as the equipment.
- Cambo WRS 1600 w/ Litz Studio V adapter
- Hasselblad CFVII50c digital back
- RRS TVC-24L with C1 Cube
- Hasselblad 250mm CF Superachromat
- PC Mutar 2X
- 2XE
- Special Guest Appearance - 180mm CF
Each scene was shot 3 times, manually defocusing and refocusing between each shot and then I picked the image I felt was most in focus for this comparison.
The operating distance is roughly 50 ft or 15.25 meters. I've also printed out a B&H test chart and taped it to the shed door so I had a target and we had some decent detail to try and resolve. Full sized images are linked, and in this post you'll find 1200px wide versions of the full scene followed by 100% crops @ 1200px (1:1). Since the light was changing a bit I did let AWB do it's thing and for the most part color shift should be minimized. For the two extender 100% crops, I did set the WB to the sheet of paper since that filled the image frame (500mm is fun!).
All images were shot at f/11 and used the redicioulsy priced X shutter release cable.
I have my impressions but don't want to bias you all, I"m curious to hear your thoughts. I included a 180mm shot as well for refernce, and have linked to that full size image as well in case it's of interest.
Let's start off with the full scene. First is the 180mm followed by the 250SA.
180mm -
Full Size (note the CA here on the door hinges and compare with the lack of CA in the 250mm SA image below)
250mm Superachromat -
Full Size (Where'd that CA go?! That is pretty cool to see..)
Now the full scene as seen with the 250SA and each 2X extender. First the Mutar 2X, then the 2XE.
250SA + Mutar 2X -
Full Size
250SA + 2XE -
Full Size
And finally the 1200px, 100% crops. No full size links here, they are crops from the above full sized images. Ideally at 1200px these should be displaying on the forum at full size.
Also a quick note here on the B&H Test print out.. There is no dark black on this image, this was all a lighter shade of gray, so don't interpret that as a lack of contrast. If you're looking for the closest thing to black it will be my handwritte "Test Target" in black magic market. Also the color in the small lines is moire, it's not present in the actual test target.
For reference, that test target PDF file is here. -
https://static.bhphotovideo.com/explora/sites/default/files/bandh-test-target.jpg
To set the stage, this is a 1200px (100% crop) from the 250mm without any extender (taken from the full sized image labeled "250mm Superachromat" above).
250SA - No Extender - 100% crop
First up, the Mutar 2x, then the 2XE follows.
250SA + Mutar 2X - 100% crop
250SA + 2XE - 100% crop
And bonus 100% crop of the 180mm CF.
180mm CF - 100% crop
Curious to hear your thoughts, and feel free to check the corners and edges on the full sized images.. the 250SA certainly doesn't disappoint.