topic EF-S lenses on R10 with adaptor: Does cropping occur? in EF & RF Lenses

EF-S lenses on R10 with adaptor: Does cropping occur?

MrWalleye73 — Tue, 06 May 2025 12:49:00 GMT

Hi....I've thoroughly confused myself, which is quite common. Looking at an R10, it is APS-C. EF-S lenses were made for APS-C as well. Would this camera crop those lenses too? Or would that be just be the full frame R series bodies that would crop to 1.6X? Hope it makes sense.

Thanks

Re: EF-S lenses on R10 with adaptor

rs-eos — Tue, 06 May 2025 11:33:11 GMT

No cropping would occur. The only time that would happen would be if using an RF-S lens on a full-frame R-series body.

Re: EF-S lenses on R10 with adaptor

MrWalleye73 — Tue, 06 May 2025 11:49:16 GMT

Thanks for the reply. It was what I was thinking. Now to decide if I want that camera....whole other confuse myself process. 😁

Re: EF-S lenses on R10 with adaptor: Does cropping occur?

ebiggs1 — Tue, 06 May 2025 14:53:31 GMT

MrWalleye7 cropping is a poor word to use to describe what happens. When you use a so called crop sensor camera nothing is cropped. It is full frame, FF, and you get exactly what you see in the VF. What is different is the "angle of view", AOV, or angle of acceptance. Basically saying if you were to compare it, and there is no reason to compare it, but if you did, let's use a 28mm lens example on a FF body opposed to the very same 28mm lens on a crop sensor body. The 28mm lens has an AOV of 74 degrees. If a camera has a crop factor of 1.6x, a 28mm lens would behave like a 45 mm lens on a FF camera.

This means the AOV would be narrower on the crop sensor camera compared to the FF camera with the same 28mm lens but there is no good reason to do this comparison. If you are crop body owner then you need to use the FL that suits your purpose and not worry what that same lens looks like on a FF body. In this case you would select a lens in the 17mm range.

I hope this clears it up a bit for you. There is no good reason to even have the term "crop factor" and in fact it mainly only applies to the FF vs the crop sensor cameras. The guys that use medium or large format cameras for example don't bother or concern themselves with crop factor although it's there only in reverse.

Re: EF-S lenses on R10 with adaptor: Does cropping occur?

MrWalleye73 — Tue, 06 May 2025 15:35:14 GMT

Thanks as well. This makes sense. I'm an old FD and EF FF film shooter and working my way into digital more. I can get my hands on some EFS glass (inherited) to to use with an R10 and adapter. I'll get the terminology and technology down as I start using a camera.

Re: EF-S lenses on R10 with adaptor: Does cropping occur?

rs-eos — Tue, 06 May 2025 15:43:40 GMT

While what you wrote is correct, the original question was specific to the camera potentially using a smaller area of the sensor with certain lenses. That would only occur if using an RF-S lens on a full-frame R-series camera (camera goes into crop mode and uses an APS-C sized portion of the sensor).

Re: EF-S lenses on R10 with adaptor: Does cropping occur?

normadel — Tue, 06 May 2025 16:52:19 GMT

"MrWalleye7 cropping is a poor word to use to describe what happens. When you use a so called crop sensor camera nothing is cropped."

This from a Legend? A crop-sensor CERTAINLY DOES crop. It is capturing PART of what comes through the lens. The crop factor is the ratio of the sensor area to the "full frame" image.

Re: EF-S lenses on R10 with adaptor: Does cropping occur?

ebiggs1 — Wed, 07 May 2025 14:00:18 GMT

"A crop-sensor CERTAINLY DOES crop."

It only "crops" if you insist on comparing it to a FF camera. Otherwise there is no cropping and there is no good reason to do the comparison. If that is a concept beyond your ability to understand I can't make it any more clear.

When you look through the VF you see what you see and you will get what you see there is no cropping. The term "crop sensor" is totally unnecessary. And the farther we get away from 35mm film days it becomes even less relevant.

However if it pleases you to continue using it by all means go a head but the fact remains nothing is ever cropped.

Re: EF-S lenses on R10 with adaptor: Does cropping occur?

MrWalleye73 — Wed, 07 May 2025 14:11:34 GMT

Thanks all....I'll be using APS-C lenses with an APS-C camera with lens mount adapter. Works for me. I read up some more and I understand what does what now. If I use my older just EF lenses, I read what happens there too.

Thanks again!!

Re: EF-S lenses on R10 with adaptor: Does cropping occur?

ebiggs1 — Wed, 07 May 2025 14:13:36 GMT

"... the original question was specific to the camera potentially using a smaller area of the sensor with certain lenses. That would only occur if using an RF-S lens on a full-frame R-series camera (camera goes into crop mode and uses an APS-C sized portion of the sensor).

Ricky,

I agree, if the term "crop sensor" does make any sense this is probably where it does so. You are physically cropping your sensor. However again if you don't have a FF camera and you do have a cropper then from your perspective nothing is cropped. Plus until you are told by someone like normadel you would never know it or be aware of it in your world nothing is cropped. And you would be correct.

Re: EF-S lenses on R10 with adaptor: Does cropping occur?

ebiggs1 — Wed, 07 May 2025 14:16:48 GMT

"Works for me."

That is all that is important. Forget "crop sensor" and enjoy your gear as is.

Re: EF-S lenses on R10 with adaptor: Does cropping occur?

normadel — Wed, 07 May 2025 15:45:48 GMT

You seem to think there's something wrong with knowledge, except when giving lengthy unnecessary explanations for simple concepts.

Re: EF-S lenses on R10 with adaptor: Does cropping occur?

SamanthaW — Wed, 07 May 2025 15:50:07 GMT

Please refrain from personal attacks, y'all. If you need to be reminded of the Community Guidelines, I've taken the liberty of linking them for you.

Re: EF-S lenses on R10 with adaptor: Does cropping occur?

justadude — Thu, 08 May 2025 14:21:43 GMT

"And the farther we get away from 35mm film days..."

While I agree fully with everything else you said about cropping, I had to chuckle at the few words I quoted from you above. I don't think we are getting farther away - quite the opposite. Out of the three local camera stores, it's getting to the point that I call first before buying 35mm (or 120) film stocks just to see what specifically they have on the shelves. The demand is getting so high for film in the past few years that these local retailers are having trouble keeping enough of the popular varieties in stock.

Re: EF-S lenses on R10 with adaptor: Does cropping occur?

ebiggs1 — Thu, 08 May 2025 14:58:44 GMT

"You seem to think there's something wrong with knowledge ...."

No sir, not at all only when the "knowledge" is wrong or misleading. IMHO, the term 'crop sensor' is at best misleading. It makes folks think something is actually happening to their photos when in actuality there is not. Every camera you pick up is full frame meaning you get exactly what you see in the VF. Baring Ricky's point. Any reference to crop sensor only happen when someone decides to compare one camera body to another. And as an unnecessary example you don't see medium or large format guys doing a similar comparison although it is there only in reverse.

New people that are just starting out have no idea of crop sensor until someone tells them. They are totally happy with what they have and the photos they get. A lot of people as we get farther away from 35mm film days don't even know what the term "full frame" means. Remember even your fancy iPhone is a crop sensor.

Re: EF-S lenses on R10 with adaptor: Does cropping occur?

ebiggs1 — Thu, 08 May 2025 15:18:04 GMT

"I had to chuckle at the few words ..."

Always happy to bring a smile to somebody's face Gary. 😊 And you are right there is certainly a growing niche market for 35mm film but not new folks And most certainly not, 20 to 25 somethings, the younger folks especially the ones that just got their brand new Rebel. R50, R7, etc., kit. For the vast majority of this group 35mm film never existed. They look through the VF. They take the shot and it looks just like what they saw. They are happy.

Re: EF-S lenses on R10 with adaptor: Does cropping occur?

zakslm — Thu, 08 May 2025 16:44:49 GMT

I am going to chime in here for no good reason other than I am enjoying this thread.

I don't know where the term "crop sensor" came from, but I (think I) understand what's going on. Disclaimer: I don't own or use an R7 or R8 but I assume my example would be the same as if I used a 90D and 5D Mark IV instead.

If you overlay the sensor of an R7 with that of an R8, it will cover only the central 62.5% of the R8's sensor. If your were taking a photo of a tree with the R7 with a 50mm lens and displayed that photo on the left monitor of a 2 monitor setup filling the entire screen, the same photo of the same tree taken with an R8 would require an 80mm lens to display the same tree appearing to be the same size and at the same magnification on the right monitor in order for the 2 photos look more or less identical. I'm probably oversimplifying it and/or missing some variables, but that's the way I think about the difference between a crop sensor camera and full frame sensor camera.

I know the the size of the "circle of confusion" of an EF-S lens is smaller than the one produced by an EF or R lens and using an EF-S lens on a full frame R camera body reduces the megapixel density of the resultant photo, but that is probably why some say that EF-S lenses or their R equivalents don't play well with full frame sensor cameras.

The older I get, the better "KISS" works for me. I've ruined or been disappointed with too many shots by overthinking.

Re: EF-S lenses on R10 with adaptor: Does cropping occur?

justadude — Thu, 08 May 2025 17:31:53 GMT

Actually it's pretty surprising that it really is a nice mix of younger folks as well as middle age and older folks getting into film. The manager at one of the local camera stores told me that the older folks know what films they want, and stick to a handful of brands, where the young folks get really experimental with a lot of the less common film stocks. He also told me I was the odd man out from the old film shooters since I'm often asking for infrared film, or CineStill, instead of Kodak Gold and HP5. (not sure if that's good or bad - lol)

Although they are in the minority of young folks (most in this age group think they are professional photographers because they have the latest iPhone), I do see a lot of the younger film shooters when wandering around doing photowalks downtown in our city, or at places like the zoo, or other public gatherings. It's kind of odd that these 20 - 30 year old people actually see that I'm shooting film, and they stop and show me what they are using, and ask a lot of film related questions. Never happens when I carry my digital gear (of course). Then I'm just any old geezer with a digital camera, that they ignore. 🙂

Re: EF-S lenses on R10 with adaptor: Does cropping occur?

zakslm — Thu, 08 May 2025 19:38:47 GMT

Gary,

This reminds me of an encounter I had a couple years ago. I was walking my dog and came across a couple of "youngsters" that I would estimate were in their late teens or early 20's. The young lady had an AE-1 similar to the original AE-1 I bought shortly after it was introduced and used for many years. I asked her about it (it looked to be in great condition) and she said she bought it at a thrift shop and was shooting black & white film. I told her that I had a camera like that years ago and wished her luck (rather than pepper her with questions and bore her with stories of my AE-1 days) and walked away. When I looked back, she was taking a picture of him with her film camera while he was taking a picture of her taking with his iPhone.

Re: EF-S lenses on R10 with adaptor: Does cropping occur?

justadude — Thu, 08 May 2025 21:23:44 GMT

I'm glad to know it's not just me seeing these young people shooting film. I sure wasn't going to bore any young people with stories of shooting film. But it is surprising how often if I break the ice by saying something like "It's a good day to shoot film" then the questions start on their end. Often I'm asked where I get my film developed (as in "do you know of any cheap places"), and when I say I do it at home, then I get asked how to get started on it.