Questions tagged [image-circle]

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votes
4answers
947 views

How to calculate focal reducer crop factor for APS-C to MFT?

As far as I can tell, the crop factor determines the size of the projected image circle and should match the ratio of sensor diameters (with standard mount forward / backward distance). My ...
0
votes
1answer
181 views

How do extension tubes affect the image circle? [duplicate]

If you abuse your lens by just stacking a bunch of extension rings one on top of the other, will this start to affect your image circle? For instance, you have a lens that can just about cover your ...
5
votes
1answer
235 views

Is there an easy way to tell the size of an image circle a lens has?

I know that lens can come in many formats, e.g. crops vs. full frame. However, someone recently told me that the Zeiss Otus has an image circle that is larger than the intended format. This is one ...
11
votes
4answers
2k views

Where does the light go when a lens with a larger image circle is projected on a smaller sensor?

I am using a full frame lens on an APS-C body. What happens with all the light, that doesn't reach my sensor, but would in a full frame camera? Do manufacturers take special measures so that light ...
3
votes
2answers
188 views

What is the light called that is outside the area of the capture medium?

Is there a name for the light that passes through a lens and does not make it to the capture medium (sensor, film, other)? I'm looking for the name of the grey area in the following image from ...
1
vote
4answers
2k views

How to calculate the radius of the image circle?

I am a beginner in this topic, so I dont know if it is possible what I try to do. First of all, I have the following HF35HA-1B lens: It says the maximum sensor size is 2/3", but I have a non-...
5
votes
2answers
598 views

Why doesn't an extension tube “crop” the picture?

Ever since I've heard of extension tubes I've been curious if they somehow crop the image that appears on the camera sensor. Based on this YouTube video, the answer is "no" (at least not that I can ...
2
votes
4answers
752 views

How long does an image circle need to be, in order to be tilt/shift lens?

Context I've been using my friend's Otus 55 on my Sony A6000 and I'm having a blast tilting that lens. With a smaller sensor APS-C, I haven't had any problems tilting a Full Frame lens and keeping ...
4
votes
1answer
288 views

Can a teleconverter make lenses designed for a “crop” sensor cover full frame?

I have a crop lens. Can I fill a full-frame sensor adding an appropriate tele converter (focal length extender? Specifically, I have a 1/2" C-mount lens and terrible vignetting on a full frame camera. ...
4
votes
1answer
313 views

What factor determines the largest usable sensor size with a certain lens?

Reading this excellent answer about field of view, focal length and sensor size a new question came to mind. From the drawn diagrams it is clearly visible that for the same focal length an increase ...
8
votes
3answers
929 views

Does the imaging circle size change when a lens zooms?

When a zoom lens is designed for a cropped (APS-C) imaging circle, does the imaging circle necessarily stay that small throughout the zoom range? It is easily understandable that a prime lens ...
3
votes
3answers
3k views

Why does my Nikkor 12-24mm lens vignette on my Nikon D800?

I have a Nikon D800 and am using a Nikon 12-24mm lens with it. When completely zoomed out it produces a vignette that I don't particularly care for. I've never seen this with my other Nikon DSLRs ...