Everyone is always asking for more information on lenses they should buy for their cameras. The common debate is between Canon vs Nikon glass because those two are the largest in the industry.
However, there are times where it is nice to have both. Nikon lenses usually have the aperture ring on the lens whereas Canon lenses do not and so you don't have the ability to full control the aperture.
You may be aware you can use your Nikon lenses on your EOS mount camera by simply using an adapter.
However, I wonder how many people test their lenses after they put on the adapter?
Here is a great article by Alister Chapman on how to properly adjust your lens adapters and make sure your focus marks on your lens still match up properly. He includes a step by step process as well as photographs you can easily follow.
Have you done this with your lenses in the past? Does this compel you to start doing this or do you feel you don't need that accuracy for your type of shooting?
Shimming Nikon to Canon Lens Adapters
Excerpt from Alister Chapman's article:
Now a problem with a lot of these adapters is that they are a little bit too thin. This is done to guarantee that the lens will reach infinity focus. If the adapter is too thick you won’t be able to focus on distant objects. This means that the focus marks on the lens and the distances your focussing at don’t line up. Typically you’ll be focussed on something 3m/9ft away but the lens markings will be at 1m/3ft. It can mean that the lens won’t focus on close objects when really it should. If your using a zoom lens this will also mean that as you zoom in and out you will see much bigger focus swings than you should. When the lens flange back (distance from the back of the lens to the sensor) is correctly set any focus shifts will be minimised. If the flange back distance is wrong then the focus shifts can be huge.
So what’s the answer? Well it’s actually quite simple and easy. All you need to do is to split the front and rear halves of the adapter and insert a thin shim or spacer. Most of the lower cost adapters are made from two parts. Removing 4 small screws allows you to separate the two halves. Make sure you don’t loose the little locking tab and it’s tiny spring!
Split the two halves apart. Then use the smaller inner part as a template for a thin card spacer that will go in between the two parts when you put the adapter back together. The thickness of the card you need will depend on the specific adapter you have, but in general I have found card that is about the same thickness as a typical business card or cereal packet to work well. I use a scalpel to cut around the smaller part of the adapter. Note that you will also need to cut a small slot in the card ring to allow for the locking tab. Also note that when you look at the face of the larger half of the adapter you will see a small lip or ridge that the smaller part sits in. Your spacer needs to fit just inside this lip/ridge.
Continue reading the instructions on Alister Chapman's article “Shimming Nikon to Canon Lens Adapters. Helps get your zooms to track focus.”
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(cover photo credit: snap from Alister Chapman)