topic Re: EF lens diameter of image field. in EF & RF Lenses

EF lens diameter of image field.

Cunha — Wed, 12 Aug 2020 12:30:22 GMT

Dear friends,

I need to know exactly the size of the projection circle or diameter of image field, of my Canon lenses. I am not finding this information online or in my Canon documentation. Please, I ask you for this information.

Lens:

Canon EF 100mm f / 2.8L Macro IS USM Lens

Canon MP-E 65mm f / 2.8 1-5x Macro Photo Lens

Canon EF 40mm f / 2.8 STM Lens (with Macro function)

In the future I intend to acquire some excellent and new Canon Tilt & Shift (50mm, 90mm 135mm) with macro capability and I know that they have a huge projection circle or diameter of image field, that will freely cover the medium format sensor, but I also don’t know specifically its circle measurements projection. If you can provide this information as well, I am also very grateful.

Thank you very much for your precious help.

Good health for you.

Re: EF lens diameter of image field.

shadowsports — Wed, 12 Aug 2020 13:38:10 GMT

Greetings,

What is this information going to be used for?

Night sky photography

Some type of projection

Why is it needed?

Re: EF lens diameter of image field.

Cunha — Wed, 12 Aug 2020 13:48:54 GMT

Greetings,

thank you for your message.

Macro work with medium format sensor.

Best regards

Re: EF lens diameter of image field.

kvbarkley — Wed, 12 Aug 2020 13:51:06 GMT

The decent quality image circle can't be much larger than the sensor, or Canon would not have limited EF-S lenses to an APS sized image on the R's

Re: EF lens diameter of image field.

Cunha — Wed, 12 Aug 2020 13:55:07 GMT

Thanks.

Re: EF lens diameter of image field.

ebiggs1 — Wed, 12 Aug 2020 14:17:10 GMT

"...the projection circle or diameter of image field, of my Canon lenses."

You are simply asking, what is the angle of view (AOV) of my lens. I am sure there is an equation to figure that out somewhere. Should be easy to find or figure out.

If your thought is to use a 35mm (EF or R) type lens on a MF camera forget it.

Re: EF lens diameter of image field.

Cunha — Wed, 12 Aug 2020 14:56:53 GMT

No, I will not forget .-) I am aware about the issues.
If you want to help constructively, I appreciate it.

An example: Zeiss ZE lens; lens diameter field=43mm (Zeiss Data sheet)
Canon macro lens?
Thanks.

Re: EF lens diameter of image field.

kvbarkley — Wed, 12 Aug 2020 14:57:35 GMT

It is more complicated than that, angle of view depends on the sensor.

Think of an EF lens on an EF-S camera. The angle of view is narrower than that you would get on an EF camera. So the image circle is larger, and some is "wasted" around the APS-C sized sensor.

Re: EF lens diameter of image field.

Cunha — Wed, 12 Aug 2020 15:00:30 GMT

Thanks.
But that information must exist somewhere.
I reiterate that Zeiss is available and is 43mm for all Classic, Milvus and Otus lenses. Maybe Canon has the same measurement, but I can't find ...
😞

Re: EF lens diameter of image field.

ebiggs1 — Wed, 12 Aug 2020 15:20:07 GMT

"It is more complicated than that, angle of view depends on the sensor."

It is complicated or at least hard to understand or grasp. The AOV never changes on any lens. It can't. The smaller sensor is exposed to exactly the same AOV, it simply doesn't see the excess because of its size. This is how we get an equivalent FL.

If on the other hand you wanted to go to a larger sensor the image circle or AOV might not be large enough to cover the MF sensor. You will be left with a black ring around your photos.

The dimensions of a 35mm sensor are typically 36×24mm. I imagine the image circle that Canon EF or R lenses produce will fill that with the appropriate circle diameter. Since it is not square the rest gets wasted just like a crop sensor does.

Re: EF lens diameter of image field.

Cunha — Wed, 12 Aug 2020 15:36:56 GMT

Thanks. I am aware of all that. But thank you very much.

The Zeiss Classic/Milvus/Otus DIF (Diameter Image Field) is 43mm (all lenses but the Otus 28mm = 43,3mm ).
My sensor is 0,8mm bigger than 43mm. An hair but, there is a tiny difference.
Where is Canon lenses DIF?

Re: EF lens diameter of image field.

kvbarkley — Wed, 12 Aug 2020 18:19:47 GMT

It is not specified, at least not that I have seen. It might be buried in a white paper on a specific lens. That is the nice thing about designing to your own mount.

Re: EF lens diameter of image field.

jrhoffman75 — Wed, 12 Aug 2020 18:33:29 GMT

I have never seen it specified. Possibly because Canon, unlike Zeiss, is manufacturing their lens for a specific camera system and therefore no one needs to know that property of the lens.

Re: EF lens diameter of image field.

Cunha — Wed, 12 Aug 2020 19:26:58 GMT

Maybe .-)

Re: EF lens diameter of image field.

Cunha — Wed, 12 Aug 2020 19:27:42 GMT

Possibly true.

Re: EF lens diameter of image field.

PLee — Fri, 14 Aug 2020 17:11:47 GMT

The TS-E 50mm f/2.8L Macro, TS-E 90mm f/2.8L Macro and TS-E 135mm f/4L Macro all have an image circle of 67.2mm.

Re: EF lens diameter of image field.

Cunha — Fri, 14 Aug 2020 18:45:23 GMT

Yes I know .-) Amazing lenses. Thanks.

Re: EF lens diameter of image field.

FloridaDrafter — Mon, 17 Aug 2020 23:58:29 GMT

@Cunha wrote:
Thanks. I am aware of all that. But thank you very much.

The Zeiss Classic/Milvus/Otus DIF (Diameter Image Field) is 43mm (all lenses but the Otus 28mm = 43,3mm ).
My sensor is 0,8mm bigger than 43mm. An hair but, there is a tiny difference.
Where is Canon lenses DIF?

Hello, Cunha,

According to EOS Magazine, the image circle of an EF lens is 43.2mm and EF-S is 27.3mm. This article is about tilt/shift lenses, which have a much larger image circle.

https://www.eos-magazine.com/articles/eospedia/canon-tilt-and-shift-lenses.html

I hope this helps.

Re: EF lens diameter of image field.

Cunha — Mon, 17 Aug 2020 23:53:56 GMT

Thank you very much.

At last!

🙂

Be safe.

Re: EF lens diameter of image field.

Marinna — Sun, 07 Feb 2021 14:26:23 GMT

If their image circle is 43.2 it’s good enough to cover most pixels in a MF sensor (I.e. 44mm * 33mm)

I saw from some adaptor manufacturer that this circle is not constant across all lens. I think this number is probably the best possible scenario. It reported telephoto lens works better than wide angle, but I would think it should be the other way around.