Fuji G617 & Canon 7D - Lens equivalents

[feradi]

Guys,

I'm very confused with this conversion... If I take a picture with a Fuji G617 using a 72mm lens what focal lenght should I use in my Canon 7D to get the same picture lenght? Is there any math formula so I can use it with other lenses?

Thanks a lot

[Mark Woods]

There is an App for the iPhone called Match Lens. There is also a much more expensive App called PCam. Both should give you the information.

[Bob Salomon]

That would be impossible to do as the 617 is a totally different proportion (3:1) then the Canon.
Do you want the same amount of information across the field as the 90mm gives or the same amount top to bottom (landscape mode of course)?

[drew.saunders]

You're comparing 56 x 168mm with 22.3 x 14.9 mm. If you shoot the 7D and then crop to 3:1, you'll be using a 22.3 x 7.4mm section, so the lens comparison factor is about 7.5:1. If you shoot and stitch two frames with the 7D, you'd have something about 44 mm x 14.9mm (assuming some overlap, so you don't get all 44.6mm), which is close to the 6x17 3:1 ratio, so you'd then have a comparison factor of about 3.75:1. In the first case, a 9.6mm lens on the cropped 7D image gets you about the same as a 72mm on the 6x17. In the second case, a 19mm or so lens. Canon makes a 10-22mm zoom, so that's probably what you'd want to use.

[feradi]

The apps looks awesome but I do not have a ipad, itouch or iphone... Thanks for the advice anyway.

For example, lets assume that the following picture was taken using a Fuji 617 with a 90mm lens,

http://www.fernandoradi.com/Example/Example_1.jpg

So my question is, what focal length do I need to take a photo with a Canon 7D similar to this below:

http://www.fernandoradi.com/Example/Example_2.jpg

I draw some white lines showing that if I crop it, the end result will be similar to the Fuji 617 picture.

Is there any formula to do such conversion?

Thanks a lot

[Chauncey Walden]

Based on Drew's frame widths, it looks like 1:2.5 so you would need a 28mm??????

[Bob Salomon]

The best way, if you do not have an action subject, would be to use a VR rig and stitch in Photoshop or another program.
This page will show you some good example of single row and multiple row panoramics using a VR system. The text is in German but the images are universal.

If you are doing images with you or the subject moving that is also possible with a VR system. See this page and click on best shot:

http://www.pixelrama.de/

http://www.pixelrama.de/panorama/beispiele/beispiele-indexfx.html

[venchka]

Turn the 7D vertical. Use a focal length that gives you more height than you need. Stitch 5 overlapping frames together. Crop to match 6x17 or 1:3.

[Lachlan 717]

You cannot change lenses on a G617, so this is a moot question.

To the best of my knowledge, even the GX617 didn't come with a 72mm option.

So, to answer your question, none. You're stuck with the 105mm you've got the G617.

[SocalAstro]

The formula to determine the angular field of view based on lens FL and "Sensor" dimension is

FOV (in radians) = 2* atan [sensor dimension / (2 * lens F.L ) ]

*sensor dimension and lens F.L must be in the same units (mm, in, etc).

To convert radians to degrees; degree = radian * 180 / pi

for the 6x17 the sensor dimension (width) is ~168mm
For the 7D the sensor dimension is 22.3mm


Hope this is what you were looking for,
Leon


Guys,

I'm very confused with this conversion... If I take a picture with a Fuji G617 using a 72mm lens what focal lenght should I use in my Canon 7D to get the same picture lenght? Is there any math formula so I can use it with other lenses?

Thanks a lot

[Ben Syverson]

The width of 6x17 is nominally 170mm, and the width of the 7D's sensor is nominally 22.3mm. Since the width is the thing you're interested in matching, the crop factor is 170 / 22.3 = 7.62X. No need to dive into radians.

So the 105mm lens on the G617 equates to 13.7mm on the 7D.

[feradi]

This was my first post and I feel at home now... I have numerous answers that will help me a lot... Thanks to all of you

[blakey]

I am still toying with this whole concept and I have used the Radian formula and the simple ratio one here are the results
617 pano 35mmx2 FF 35mm canon 7D
sensor mm 170 72 36.00 22.30
Lens FL 2.36 4.72 3.23
72 30.49 15.25 22.30
90 38.12 19.06 27.88
105 44.47 22.24 32.52
180 76.24 38.12 55.75
300 127.06 63.53 92.92


I am using pentax 67 lenses on the front of the 35mm camera and moving the camera a tool of 22mm in each direction to achieve a single stick of 2 x 35mm FF sensors so for example i have a 45mm pentax67 lens which sits on my rig and i stitch 2 images and achieve a 3:1 ratio image.

What I am trying to determine for each of my lenses, 45,105,165 and 300 what size eye piece in 617 world do i buy for each of these lenses and even if one exists.

Thinking in terms of Fuji 617 with its 105 lens and viewfinder - what is the equivalent 35mm or canon 7D lens to achieve that according to above would be a 22mm on FF or 32mm on 7D ??? with my pentax67 to 35mm rig it would be near the 45mm lens ????


Does any of this make sense.

The other way of asking the same question is to say if I have a pentax67 45mm lens and use it in front of a 35mm digital camera to stick two images together i.e. a 72x24mm image on the sensor, what is the equivalent 35mm LENS that needs to be used to get the same field of view across the width and what one on the 7D ?

Thanks guys, this has been bugging me for ages and I want o purchase a viewfinder for a 617, not sure which one for each of the 45,105,165,300 lenses


Just so i can walk around looking like a film director with my viewing scope !!!!