Welcome to Photography Stack Exchange
We're a little bit different from other sites. Here's how:
Ask questions, get answers, no distractions
This site is all about getting answers. It's not a discussion forum. There's no chit-chat.
Just questions...
...and answers.
Good answers are voted up and rise to the top.
The best answers show up first so that they are always easy to find.
The person who asked can mark one answer as "accepted".
Accepting doesn't mean it's the best answer, it just means that it worked for the person who asked.
Why am I having problems focusing with extension tubes?
I am adding Kenko tubes to my Nikon 50mm 1.8 D lens. I need some advice. This is my first time using extension tubes. I can't focus. I'm just getting a blurred image. Any advice would be welcome.
531 silver badge4 bronze badges
2 Answers
When you add extension tubes, your camera become myopic, it will no longer focus to infinity (the ring shifts the focus range towards you). The thicker the ring or the shorter the lens, the more pronounced the effect. With the same 21mm ring on my 17-70 lens, at 70mm infinity focus is brought to 15cm while at 17mm it must be somewhere inside the lens.
20.2k1 gold badge28 silver badges61 bronze badges
What everyone else said... Try looking at something relatively close (flowers on a table, etc.) and focus by moving closer or further away. You'll find that the focusing ring may have little effect, especially with longer extensions. Another odd effect is that when used with a zoom lens the zoom will change focus as well.
6,6841 gold badge23 silver badges36 bronze badges
Get answers to practical, detailed questions
Focus on questions about an actual problem you have faced. Include details about what you have tried and exactly what you are trying to do.
Not all questions work well in our format. Avoid questions that are primarily opinion-based, or that are likely to generate discussion rather than answers.
Questions that need improvement may be closed until someone fixes them.
Tags make it easy to find interesting questions
All questions are tagged with their subject areas. Each can have up to 5 tags, since a question might be related to several subjects.
Click any tag to see a list of questions with that tag, or go to the tag list to browse for topics that interest you.
Why am I having problems focusing with extension tubes?
I am adding Kenko tubes to my Nikon 50mm 1.8 D lens. I need some advice. This is my first time using extension tubes. I can't focus. I'm just getting a blurred image. Any advice would be welcome.
531 silver badge4 bronze badges
You earn reputation when people vote on your posts
Your reputation score goes up when others vote up your questions, answers and edits.
As you earn reputation, you'll unlock new privileges like the ability to vote, comment, and even edit other people's posts.
At the highest levels, you'll have access to special moderation tools. You'll be able to work alongside our community moderators to keep the site focused and helpful.
Improve posts by editing or commenting
Our goal is to have the best answers to every question, so if you see questions or answers that can be improved, you can edit them.
Use edits to fix mistakes, improve formatting, or clarify the meaning of a post.
Use comments to ask for more information or clarify a question or answer.
You can always comment on your own questions and answers. Once you earn 50 reputation, you can comment on anybody's post.
Remember: we're all here to learn, so be friendly and helpful!
When you add extension tubes, your camera become myopic, it will no longer focus to infinity (the ring shifts the focus range towards you). The thicker the ring or the shorter the lens, the more pronounced the effect. With the same 21mm ring on my 17-70 lens, at 70mm infinity focus is brought to 15cm while at 17mm it must be somewhere inside the lens.
20.2k1 gold badge28 silver badges61 bronze badges
Unlock badges for special achievements
Sign up to get started
Signing up allows you to:
- Earn reputation when you help others with questions, answers and edits.
- Select favorite tags to customize your home page.
- Claim your first badge: Informed
Photography Stack Exchange is part of the Stack Exchange network
Like this site? Stack Exchange is a network of 182 Q&A sites just like it. Check out the full list of sites.
