Looks like your software does not support the raw format from your camera. What software are you using? I had this problem when I used Raw Therapee and tried to open my Canon 5D Mark IV CR2 files.

I love the 50mm focal length on both full frame and cropped frame bodies. My favorite of the Canon 50mm lens is the f/2.5 macro. The focus is a little noisy and the AF is adequate. The manual focus is very good on this lens.

The f/1.8 versions of the the 50mm are very similar in image quality with the STM version having a little more pleasing bokeh. I do not like the STM version for still photography because of the difficuly of manually focusing the STM type lens- this is a personal opinion (I do a lot of night photography).

The f/1.4 version is one I prefer for low light conditions. Although I rarely use it wide open, it's AF is considerably better in extreme low light conditions. I have had this lens for years and I have never experienced any of the issues that some users have had with this lens. The sharpness difference between the f/1.8 and f/1.4 are very slight even at the pixel peeping level- the f/1.8 may have a slight edge. The f/1.4 version has considerably better contrast and color rendition than the f/1.8 versions. At least this is true with my copies.

Thanks for you reply. I know that the photo is not a macro, but a close-up photo. I am using a continuous LED ring light. The Kelvin temp is 5500 K and this is correct as far as I can determine. Using a grey card I get the same results. The ground (substrate) is the correct color but the tarantula has a slight yellow hue. This is a consistent problem- using the ring light, flash, and ambient light.

I have read that this can be a problem with certain species of tarantulas and insects. I am just looking for suggestions. Apparently this is not the correct section of UHH to ask for help with this since I am not taking true macro photos. I'm sorry.

Thanks. I did try setting the WB by the color temperature. I can get the eco-earth close to correct but the spider is way off. As was also suggested by Mark, I may try direct sunlight when the weather warms up a bit.
I served as the mayor of Walthill for a while and now I am out of politics My dad was the postmaster in Dakota City for a couple of years.

Thanks. The ambient light temperature is 5000 K. I have tried both black and white backdrops around the terrarium and that seems to make no difference.

I may try my 5D MK IV using liveview to see if I can get better color.

I am having problems getting the colors correct when taking photos of my Aphonopelma Chalcodes. If I get the dirt correct, the spider is too cool and I can not get the blonde coloring near correct. I shoot in raw and my ring light is a temp of 5500. The iridescent hairs on the legs seem to absorb certain light frequencies. Any ideas? The camera used is a Canon 1Dx with the 50mm f/2.5 macro lens- with and without the life size adapter.

If my memory serves me right- the Pro 300 Teleplus has 7 lens elements in 4 groups, and will be optically better than the MC4, which has 4 lens elements in 4 groups.

I would not consider the 24-105mm STM lens. The STM version is nice for video AF but the image quality is not near the quality of the 24-105mm f/4 L lens (versions 1or 2). Also, on a cropped frame body, you lose a bit on the wide side- if that matters to you.

http://www.techradar.com/reviews/cameras-and-camcorders/cameras/canon-eos-5d-mark-iv-1326906/review

In several of the review videos they also referenced this.

Yes and no.

The Canon EOS 5D Mark IV uses both a DIGIC 6 and a DIGIC 6+ processor, with the former used solely for metering, freeing up the DIGIC 6+ processor to handle everything else, including the 61-point AF system with 41 cross-type sensors.

Many of the front end tele/macro converters are quite heavy and change the balance of the lens- this can damage the AF drive in the lens.

I remember my T1i very well. The Sigma lens should do well on that body for a walk around/ general purpose lens. When I updated to the T2i I began to notice some of the limitations in the wide range zooms. I preferred the Canon 55-250mm over the Canon 70-300mm for image quality on the Canon Rebels that I owned. The 70-300mm IS USM became very 'soft' at focal lengths about around 210mm, even in the center. My favorite walk around lens for Canon Rebels was the EF-S 17-85mm f/4-5.6, that is until I got the Canon 24-105mm f/4L.

What camera? What subjects do you shoot?

The Canon 70-300mm IS USM is probably the best of the three. The Sigmas listed have a greater focal range but with that comes many compromises to the image quality.

You don't mention what you photograph.

The AF in the 7D MKII is far better at tracking moving subjects than the original 7D. It AF is quicker and has more AF points. If you shoot in LiveView or shoot video, the dual pixel AF is great. You can shoot at a little higher ISO (only you can determine how much noise you are satisfied with). In my experience, the noise cleans up much better than the original 7D.

From what you state you would like in the camera, I would recommend the 80D over the 6D.

The 80D has several advantages such as the AF system for both still and video, the dynamic range, more megapixels, newer technology, and touch screen.

The 6D will have slightly better low light performance- the 80D has amazing low light abilities for a Canon cropped sensor.