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# Thread: 8x10/300mm lens - 35mm focal length equivalent?

1. ## 8x10/300mm lens - 35mm focal length equivalent?

Title says it all...I'm just starting out with the big boy and wondered

2. It's usually considered a normal lens--use it like you would a 50mm on a 35mm camera, or thereabouts. Since the shape of the frame is different, there really aren't "equivalents."

3. This might help give you an idea of FOV 'equivalents'.

4. ## 44

44mm 50*

kodak pro guide

5. A lens with a focal length of 45mm is closest with 50mm being runner up.

6. Wirelessly posted (BBBold: BlackBerry9000/4.6.0.297 Profile/MIDP-2.0 Configuration/CLDC-1.1 VendorID/102 UP.Link/6.3.0.0.0)

Yup, widish normal lens focal length.

7. If you are making an 8x10 from the 35mm, a 300mm is like a 38mm.

If you are making a 6.3 x 9.5 (an 8x10 neg counting the border) the 300 is like a 45mm on 35.

In any case, between a 35mm and 50mm.

A classic 2 lens outfit for 8x10 has been a 10" and either a 14" or 19".

8. Diagonal of 135 is 43.2mm.
Diagonal of 8x10 is 305mm.
300/305 = 0.9836
0.9836 x 43.2 = 42.49mm

Can't get more precise than that unless you measure the aperture opening of a specific 135 camera and of a specific 8x10 film holder. But DF is right... if you crop 135 to 8x10 that changes the formula.

Diagonal of cropped 135 is 38.4mm.
0.9836 x 38.4 = 37.8mm

So a 35mm lens on a cropped 135 image (24x30mm) is closest to matching a normal (305mm) 8x10 lens and is even closer matching FOV of a 300mm.

9. mikes got it

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