When using extension tubes…

Atho wrote:

Is there an easy way to calculate the distance to which a lens will focus after adding a 10 or 16mm extension tube or both? (I know I will lose infinity focus, whatever the h€|l that means)

Hint. It must be really easy because I’m really stupid. No point in offering any complicated equations because I will just lose the will to live.

Infinity is the opposite of minimum focus, so you can focus on distant subjects.

When you add the extension tubes,the infinity setting will then be inches. It won't focus if you aren't close enough.

With a micro 4/3 at 45mm, I'd be nearly touching the subject with 26mm tubes. I didn't bother to stack them or I was too close.

Atho wrote:

Is there an easy way to calculate the distance to which a lens will focus after adding a 10 or 16mm extension tube or both? (I know I will lose infinity focus, whatever the h€|l that means)

Hint. It must be really easy because I’m really stupid. No point in offering any complicated equations because I will just lose the will to live.

See if this page is of any use:

http://extreme-macro.co.uk/extension-tubes/#calculator

BBbuilder467 wrote:

Atho wrote:

Is there an easy way to calculate the distance to which a lens will focus after adding a 10 or 16mm extension tube or both? (I know I will lose infinity focus, whatever the h€|l that means)

Hint. It must be really easy because I’m really stupid. No point in offering any complicated equations because I will just lose the will to live.

Infinity is the opposite of minimum focus, so you can focus on distant subjects.

When you add the extension tubes,the infinity setting will then be inches. It won't focus if you aren't close enough.

With a micro 4/3 at 45mm, I'd be nearly touching the subject with 26mm tubes. I didn't bother to stack them or I was too close.

Ta, thanks.

DanRN wrote:

Atho wrote:

Is there an easy way to calculate the distance to which a lens will focus after adding a 10 or 16mm extension tube or both? (I know I will lose infinity focus, whatever the h€|l that means)

Hint. It must be really easy because I’m really stupid. No point in offering any complicated equations because I will just lose the will to live.

See if this page is of any use:

http://extreme-macro.co.uk/extension-tubes/#calculator

Thanks for the contribution. According the the calculation my minimum focus distance increases to 78.4 from 70cm…

Atho wrote:

DanRN wrote:

Atho wrote:

Is there an easy way to calculate the distance to which a lens will focus after adding a 10 or 16mm extension tube or both? (I know I will lose infinity focus, whatever the h€|l that means)

Hint. It must be really easy because I’m really stupid. No point in offering any complicated equations because I will just lose the will to live.

See if this page is of any use:

http://extreme-macro.co.uk/extension-tubes/#calculator

Thanks for the contribution. According the the calculation my minimum focus distance increases to 78.4 from 70cm…

You’re welcome.  I recommend that site all the time. 
Still really helpful, despite being dormant for a while.

DanRN wrote:

Atho wrote:

Is there an easy way to calculate the distance to which a lens will focus after adding a 10 or 16mm extension tube or both? (I know I will lose infinity focus, whatever the h€|l that means)

Hint. It must be really easy because I’m really stupid. No point in offering any complicated equations because I will just lose the will to live.

See if this page is of any use:

http://extreme-macro.co.uk/extension-tubes/#calculator

It is still very useful, the laws of physics are not updated that often fortunately! I'm sort of old school and like to check if what I see/want is realistic. Starting to test different lenses with bellows  with a large adjustment range is easier if you can figure out what to expect (and what is "out of range") like when you have a specific object you want to catch and get a reasonable result in the end.

... and then there is all the software in the camera doing the actual focusing and the lighting ... and ... and ...

East Gothia wrote:

DanRN wrote:

Atho wrote:

Is there an easy way to calculate the distance to which a lens will focus after adding a 10 or 16mm extension tube or both? (I know I will lose infinity focus, whatever the h€|l that means)

Hint. It must be really easy because I’m really stupid. No point in offering any complicated equations because I will just lose the will to live.

See if this page is of any use:

http://extreme-macro.co.uk/extension-tubes/#calculator

It is still very useful, the laws of physics are not updated that often fortunately! I'm sort of old school and like to check if what I see/want is realistic. Starting to test different lenses with bellows with a large adjustment range is easier if you can figure out what to expect (and what is "out of range") like when you have a specific object you want to catch and get a reasonable result in the end.

... and then there is all the software in the camera doing the actual focusing and the lighting ... and ... and ...

I’ve gotten to the point where the only time I autofocus with macro/close ups is when stacking. If a static subject, I’ll use a rail. If not, or I’m using a flash, I’ll rock the camera back and forth manually. The results there definitely vary.
But, if it were easy, where’s the challenge in that? ;p If I blow a shot, it’s not like I missed Bigfoot or a UFO… there’ll definitely be more insects.

Atho wrote:

DanRN wrote:

Atho wrote:

Is there an easy way to calculate the distance to which a lens will focus after adding a 10 or 16mm extension tube or both? (I know I will lose infinity focus, whatever the h€|l that means)

Hint. It must be really easy because I’m really stupid. No point in offering any complicated equations because I will just lose the will to live.

See if this page is of any use:

http://extreme-macro.co.uk/extension-tubes/#calculator

Thanks for the contribution. According the the calculation my minimum focus distance increases to 78.4 from 70cm…

That doesn't sound right. The minimum focus distance wouldn't "increase" when adding extension tubes.

With a 45mm lens and 26mm tubes, it's showing 183mm and 0.76x magnification, which sounds about right. That's from subject to sensor.

BBbuilder467 wrote:

Atho wrote:

DanRN wrote:

Atho wrote:

Is there an easy way to calculate the distance to which a lens will focus after adding a 10 or 16mm extension tube or both? (I know I will lose infinity focus, whatever the h€|l that means)

Hint. It must be really easy because I’m really stupid. No point in offering any complicated equations because I will just lose the will to live.

See if this page is of any use:

http://extreme-macro.co.uk/extension-tubes/#calculator

Thanks for the contribution. According the the calculation my minimum focus distance increases to 78.4 from 70cm…

That doesn't sound right. The minimum focus distance wouldn't "increase" when adding extension tubes.

With a 45mm lens and 26mm tubes, it's showing 183mm and 0.76x magnification, which sounds about right. That's from subject to sensor.

Atho wrote:

BBbuilder467 wrote:

Atho wrote:

DanRN wrote:

Atho wrote:

Is there an easy way to calculate the distance to which a lens will focus after adding a 10 or 16mm extension tube or both? (I know I will lose infinity focus, whatever the h€|l that means)

Hint. It must be really easy because I’m really stupid. No point in offering any complicated equations because I will just lose the will to live.

See if this page is of any use:

http://extreme-macro.co.uk/extension-tubes/#calculator

Thanks for the contribution. According the the calculation my minimum focus distance increases to 78.4 from 70cm…

That doesn't sound right. The minimum focus distance wouldn't "increase" when adding extension tubes.

With a 45mm lens and 26mm tubes, it's showing 183mm and 0.76x magnification, which sounds about right. That's from subject to sensor.

That's at 150mm. With a zoom lens, you need to calculate at the wide end to find the maximum magnification and minimum focus.

With the micro 4/3, 26mm tubes at 40/45mm is about the practical limit.

• TSteveY80 wrote:

Atho wrote:

BBbuilder467 wrote:

Atho wrote:

DanRN wrote:

Atho wrote:

Is there an easy way to calculate the distance to which a lens will focus after adding a 10 or 16mm extension tube or both? (I know I will lose infinity focus, whatever the h€|l that means)

Hint. It must be really easy because I’m really stupid. No point in offering any complicated equations because I will just lose the will to live.

See if this page is of any use:

http://extreme-macro.co.uk/extension-tubes/#calculator

Thanks for the contribution. According the the calculation my minimum focus distance increases to 78.4 from 70cm…

That doesn't sound right. The minimum focus distance wouldn't "increase" when adding extension tubes.

With a 45mm lens and 26mm tubes, it's showing 183mm and 0.76x magnification, which sounds about right. That's from subject to sensor.

That's weird. I wonder if the "minimum focusing distance" on that form actually means the furthest the lens can still focus with the extension tubes attached?

I really can’t comment as I don’t actually have any extension tubes though have just bought a set online. I’ll update you when they arrive

It really doesn't make sense otherwise.

If you're using something like a 40-150mm zoom, rather than a shorter prime lens, I'd personally recommend looking at close-up lenses (e.g. a Raynox DCR-150) rather than extension tubes.

SteveY80 wrote:

Atho wrote:

BBbuilder467 wrote:

Atho wrote:

DanRN wrote:

Atho wrote:

Is there an easy way to calculate the distance to which a lens will focus after adding a 10 or 16mm extension tube or both? (I know I will lose infinity focus, whatever the h€|l that means)

Hint. It must be really easy because I’m really stupid. No point in offering any complicated equations because I will just lose the will to live.

See if this page is of any use:

http://extreme-macro.co.uk/extension-tubes/#calculator

Thanks for the contribution. According the the calculation my minimum focus distance increases to 78.4 from 70cm…

That doesn't sound right. The minimum focus distance wouldn't "increase" when adding extension tubes.

With a 45mm lens and 26mm tubes, it's showing 183mm and 0.76x magnification, which sounds about right. That's from subject to sensor.

That's weird. I wonder if the "minimum focusing distance" on that form actually means the furthest the lens can still focus with the extension tubes attached?

It really doesn't make sense otherwise.

If you're using something like a 40-150mm zoom, rather than a shorter prime lens, I'd personally recommend looking at close-up lenses (e.g. a Raynox DCR-150) rather than extension tubes.

I think it's misleading combining the long focal length with the advertised magnification. My 45-200 came up at 1100mm. I think it does come out if I set it to 200mm and manually set minimum focus. It would be accurate with a prime, but varies throughout the zoom range.

When you add extension tubes to a zoom lens, the maximum magnification is at the wide end. It's like zooming backwards. At 45mm with 26mm tubes, you'll get close to 0.8x magnification, but the lens will be nearly touching the subject.

BBbuilder467 wrote:

When you add extension tubes to a zoom lens, the maximum magnification is at the wide end. It's like zooming backwards. At 45mm with 26mm tubes, you'll get close to 0.8x magnification, but the lens will be nearly touching the subject.

I only need to get a piece of the 0.8X. In fact as soon as the tubes arrive I’ll experiment with them and the 2X tc.