Instruction: Given a question and the related document, and generate the answer to the question based on the information provided in the document.

Input:
Question: Why is the image so pixellated and blurry when viewed through the VF-4? Using a Canon 600d / T3i
Document: The bale is needed if you are using the VF-4 with a battery grip. The older VF-3 could be modified slightly to allow it to fit the height of the 5d Mark III with grip. But, this VF-4 version works perfectly without modifications. If you are using a grip, get this bale with your VF-4 kit. Quality is right on! !
The Zacuto comes with a dustcover for the wide end. The VF-4 has no dustcover; so far dust has not been a problem.The VF-4 attaches to the camera by sliding a thin metal plate on the viewfinder into a slot on the plate, and then tightening a screw. It takes 5 seconds, is very secure, and is a great solution. The Zacuto attaches to the camera by snapping a plastic ring.
There is a large soft rubber eye cup that fits on the viewfinder. It is possible to rotate the eye cup to use with either eye. It works great without my glasses. Unfortunately I always wear my glasses and the fit is not perfect. It isn't uncomfortable, but some extraneous light does get in.You can ruin an LCD screen if sunlight enters through the viewfinder. There is an ingenious switch on the VF-4 to rotate an occluder into place. This is very convenient.
If you use a different tripod mounting system or rig, then you would have to mount that beneath the VF-4 base plate. The mounting hole is slightly off center. This is not normally a problem, but could present problems with certain rigs. If you need the mount to be centered Zacuto sells an adapter to fix this. I do not know whether this adapter will fit the VF-4.The optics are superb. It is tack sharp from edge to edge.
Both products have a base plate that screws into the standard 1/4" connection on the bottom of virtually all cameras. The plate for the VF-4 is compatible with the Arca Swiss tripod mounting system. Since my tripod uses an Arca Swiss compatible mount, it is convenient to leave the base plate on the camera and always be able to install the viewfinder or mount on the tripod in seconds. The Zacuto uses a gorilla plate which is compatible with other Zacuto products.
My previous experience was with the Hoodman viewfinder. The very cheap optics and inadequate method of fastening the viewfinder to the camera with straps made this unacceptable. The gold standard of viewfinders is the Zacuto Z-Finder Pro. However, this is terribly expensive.After much research I decided on the Carry Speed VF-4 viewfinder. I believe it compares quite well with the Zacuto product, and I was especially happy that the cost of the Carry Speed was less than half that of the Zacuto.
I highly recommend for anyone with a Canon 5D Mark III!
Great unit for outdoor work. It serve me well on sunny days. I use it on Nikon D7100 and Canon 6D. Great compatibility.
I was a bit skeptical, I'll admit it. I own the previous generation of this product for my Canon 7D and it worked, but it is nothing compared to this version. Everything about this product makes it worth twice the money. The base plate is solid, the connection mechanism to remove it is quick and easy, the sun hood is great. I think the only thing that I would have liked is a neck strap for when I remove it.
I'm VERY pleased with this product, for use with my Canon 7D.It makes a BIG difference in the use of the camera.I'm glad I got this version instead of the prior model.This one fixed a few things. The construction is good.I don't know if it has an actual diopter, but it seemedto work with my need for bi-focal glasses, which wasa concern. Afaict, I could easily tell if the scene wasin focus or not. So that was good.
Answer: Have you tried focusing the VF-4?  Turn the red knob until your camera's on-screen data looks sharp.