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DJMC
6th June 2011, 09:00 PM
The 40-150 I bought a month ago doesn't seem to work.

When trying to focus, it does occasionally but most of the time it just shudders with a through the lens left/right movement but won't focus.

Any ideas?

I've tried it and three other lenses on two bodies and it's only this one which doesn't focus.

Looked at the lens contacts but looks fine to me.

:confused:

DJMC
6th June 2011, 09:41 PM
This little problem has made me try out the Mk2 40-150 which came with the E-600 I bought recently.

I hadn't realised how small and light this one is compared to the Mk1 !!

I know I lose a little aperture with the Mk2 but has anyone ever wished they had a Mk1 instead of a Mk2, as it seems like a cracking little lens to me!

Maybe not as substantial as the Mk1, but is the Mk2 known for any problems in the build dept.?

What about image quality between the two? Any comparisons anywhere??? - don't worry, found them. The jury's split by the looks of things!

:confused:

DJMC
6th June 2011, 09:58 PM
Just tried the Mk1 in the bright lighting of the kitchen and it works fine!? :confused:

I was trying it in my more dimly lit study before. The Mk2 focused in there, as did 14-42 and 14-54 but not the Mk1 40-150? Is the slight 'shudder' and then nothing the lens' way of telling me not to be daft? I did have the flash illuminator working on the E-510 but that didn't make any difference.

I'll give it another go in the daylight tomorrow. Meanwhile, can anyone explain what's occurred?

Probably 'user error' !! :rolleyes:

Thanks!

;)

francois
6th June 2011, 10:35 PM
Sorry, can't think of anything right now.

Ulfric M Douglas
7th June 2011, 07:20 AM
... but has anyone ever wished they had a Mk1 instead of a Mk2, as it seems like a cracking little lens to me!

Maybe not as substantial as the Mk1, but is the Mk2 known for any problems in the build dept.?
No problems that I know about.
I'd expect my MkI to fail earlier than my MkII because it is much older and has to move more glass around each time it focuses.
Both are excellent lenses and the image quality seems very similar.
My wife uses the MkII one-handed on e-600, not really comfy with the MkI.

( MkII autofocuses with adapter on my Lumix G1, MkI doesn't.)

Zuiko
7th June 2011, 07:33 AM
Seems unlikely the Mk1 wouldn't focus in a situation where the Mk2 can, maybe it's an intermittant fault? I think perhaps more testing is required, followed by referal back to seller if problem persists.

DJMC
7th June 2011, 09:26 AM
Tried it again this morning and no shuddering, but it won't focus on as near an object as the Mk2. Is that as it should be?

Mk2 at 40 will auto-focus down to 45cm whereas Mk1 is around 90cm. Anything over that it works fine.

I'm sure the problem last night was low light and I'd rather keep the Mk1 having seen this test: http://www.biofos.com/esystem/4015_tst.html

Also, it matches the size/weight of the 14-54 well whereas the Mk2 would seem to be more at home with the 14-42 on a lighter body than the E-1 which I'm keeping for definite. The heavier lenses balance well on it.

As I can't see me using the 40-150 at distances under 90cm I think I'm happy but would like to know if my Mk1 is 'different' !?

:rolleyes:

peak4
7th June 2011, 09:47 AM
These figures are taken from the USA 4/3s site, which in turn were taken from Oly's site at the time
40-150mm Mk1
Focal length: 40-150
Lens construction: 13 Elements
Angle of view: 30-8.2 Degrees
Closest focusing distance: 1.5m
Max aperture: F3.5-F4.5mm
Min aperture: f22
Filter size 58mm
Dimensions: 3D x 4.21L
Weight 15.75 oz.
Tele 1.4: Yes MF only
Ex Tube: Yes .62X magnification


And these from Oly UKs site

40-150mm Mk2
Modelname ZUIKO DIGITAL ED 40-150mm 1:4.0-5.6
Focal length 40mm - 150mm zoom
35mm equivalent focal length 80mm - 300mm
Construction
Lens 12 elements in 9 groups, including ED Lens Element
Mechanism 3 groups for zooming,
Internal focusing system
Dust and Splash Proof No
Angle of view 8.2 - 30 degrees
Closest focusing distance 0.9m
Maximum image magnification 0.14x
(35mm equivalent Maximum Image Magnification: 0.28x)
Aperture
Number of blades 7 (Circular aperture diaphragm)
Maximum aperture 1:4.0 (wide) - 1:5.6 (tele)
Minimum aperture 1:22
Filter size 58mm
Size/weight
Dimensions 65.5mm (D) x 72mm (L)
Weight 220g
Compatibility
Tele converter EC-14 Yes
Extension tube EX-25 Yes

As you can see, it is possible to focus closer than Oly guarantee, but the Mk2 is designed to focus closer than the Mk1

DJMC
7th June 2011, 10:48 AM
Aha!

Well done Bill, thanks for posting that. It fits in with what I'm finding so I'm happy that the lens is performing normally and it's just my inexperience with auto-focus in dim light which has led to my concerns.

I guess the 'shudder' in low light was the lens reacting to some kind of half hearted command from the camera telling it to 'be ready' to focus, but it then failed to follow through!?

I must say, if I was keeping the E-510 only, that body plus a 14-42 and Mk2 40-150 would make a great lightweight combination. However, even if I do keep the E-510 it would be unlikely I'd want to mount the 14-42 when I have my 14-54, although the differences between Mk1 & Mk2 40-150 lenses seems to be less pronounced from what I've read.

:)

francois
7th June 2011, 04:16 PM
Good thinking from Bill. One to keep in mind when testing lenses!