Canon EOS DSLR Lens

jims-terrano · 10-07-2011, 12:35

Does anyone know what the equivalent Canon 28 to 105MM Film camera Lens is to a DSLR? Something to do with the sensor not being the same size as a 35mm frame.

Thanks
Jim

macabethiel · 10-07-2011, 17:38

I thought the focal length of a lens is the same be it digital or film if you are talking about optical zoom.

Digital cameras often have two types of zoom one is based on focal length so its optical the other a zoom effect created digitally rather like that on a PC viewer so its an artificial magnification effect.

If you use a 28mm to 105 mm optical lens it matters not if the film is 35 mm or an old 128 format the zoom capability is the same. Likewise if the sensor is less than 35 mm in size it does not change the zoom ability.

Deleted account DD · 10-07-2011, 20:57

Quote:

Originally Posted by jims-terrano

Does anyone know what the equivalent Canon 28 to 105MM Film camera Lens is to a DSLR? Something to do with the sensor not being the same size as a 35mm frame.

Thanks
Jim

lol, been trying to understand that since I bought my 550d a bit back.

When i went in to look at other lenses the bloke in the shop said "oh that 28 to 135 is the same as a xxx to xxx youd be used to on your old A1, theres a formula to work it out " .................eh

http://www.the-digital-picture.com/C...op-Factor.aspx

apparently it s the size of the sensor and position of the focal plane that sets the formula. No I dont understand it fully either pls explain to me once you do

http://www.dpreview.com/learn/?/Glos...tiplier_01.htm

http://www.cambridgeincolour.com/tut...era-lenses.htm

I am told for my EOS550D and many other canons it is factor 1.6 though I did see 1.2 bandied about for another model.

Which one do you have Jim?

Deleted account DD · 10-07-2011, 21:00

quick update........................

just found a couple of pages which both say the EOS1D is 1.3 but the rest are 1.6

Hope that helps.

http://www.dummies.com/how-to/conten...eat-sheet.html

jims-terrano · 10-07-2011, 21:23

I would rather drive through mud than see through it LOL.

Got a 300D body only at a very good price, did someone a favor and got paid in camera. My film camera is a EOS 5 which has been a great work horse, it has a 28 to 105mm EF. So you can see my plan.

Jim

Deleted account DD · 10-07-2011, 21:28

yup, and a good one too

just take a few shots at extremes of focal length and aperature to make sure its not one of the lenses that vignette

Some of the 35mm to d swaps do with canon and it would be a shame if you didnt notice it until after the once in a lifetime shot

10-07-2011, 12:35	#1
jims-terrano Senior Member Join Date: Sep 2004 Location: UK Posts: 12,965	Canon EOS DSLR Lens Does anyone know what the equivalent Canon 28 to 105MM Film camera Lens is to a DSLR? Something to do with the sensor not being the same size as a 35mm frame. Thanks Jim

10-07-2011, 17:38	#2
macabethiel Senior Member Join Date: Aug 2008 Location: Derby Vehicle: Freelander & Jeep GC 3.0 Posts: 4,416	Lens talk I thought the focal length of a lens is the same be it digital or film if you are talking about optical zoom. Digital cameras often have two types of zoom one is based on focal length so its optical the other a zoom effect created digitally rather like that on a PC viewer so its an artificial magnification effect. If you use a 28mm to 105 mm optical lens it matters not if the film is 35 mm or an old 128 format the zoom capability is the same. Likewise if the sensor is less than 35 mm in size it does not change the zoom ability.

10-07-2011, 21:00	#4
Deleted account DD Senior Member Join Date: Sep 2008 Posts: 4,705	quick update........................ just found a couple of pages which both say the EOS1D is 1.3 but the rest are 1.6 Hope that helps. http://www.dummies.com/how-to/conten...eat-sheet.html

10-07-2011, 21:23	#5
jims-terrano Senior Member Join Date: Sep 2004 Location: UK Posts: 12,965	I would rather drive through mud than see through it LOL. Got a 300D body only at a very good price, did someone a favor and got paid in camera. My film camera is a EOS 5 which has been a great work horse, it has a 28 to 105mm EF. So you can see my plan. Jim

10-07-2011, 21:28	#6
Deleted account DD Senior Member Join Date: Sep 2008 Posts: 4,705	yup, and a good one too just take a few shots at extremes of focal length and aperature to make sure its not one of the lenses that vignette Some of the 35mm to d swaps do with canon and it would be a shame if you didnt notice it until after the once in a lifetime shot