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[OM] Re: Zuiko 24-40mm f4 has arrived

Subject: [OM] Re: Zuiko 24-40mm f4 has arrived
From: Paul Yates <paul@xxxxxxxxxxx>
Date: Sun, 30 Mar 2008 17:14:30 -0400
Moose,

Excellent advice! Yes, the zoom does work in that fashion (growing 
longer towards the wide end) and I understand how the hood is optimized 
for the focal length range. I'll certainly consider going this route.

Thanks!

Paul

BTW, everyone, see the threads at forum.manualfocus.org or FM 
(Alternative Gear) if you'd like to see sample shots and 100% crops 
taken with this lens. Nearly prime-like throughout the range and 
basically no CA. Looks like Nakagawa took this one pretty seriously. 
Also, the lens does have a warmish cast and when I hold it up to a white 
background, there are subtle signs of yellowing. Looks like there is 
some rare earth in this one.




Moose wrote:
> Chuck Norcutt wrote:
>> Don't ignore the possibility that the front cell with filter threads 
>> might be shared with another lens.  JH could possibly have the part or a 
>> junker might be obtained which has a good front cell.....
>>   
> The obvious first place to look is the 35-70/3.6. These two lenses are 
> VERY near twins in appearance and external construction. I find it hard 
> to believe that the 24-40 isn't a riff on the 35-70 optical formula 
> using many of the same mechanical parts.
> 
> Paul Yates wrote:
> 
>> ....  The clamp-ons are a decent option, 
> I can't tell from your photos, as they all seem to be taken at the 40mm 
> zoom setting. But I sort of suspect (from where the '40' is relative to 
> the index mark and the direction of the other fl markings from it) that 
> the lens gets longer as you zoom to 24mm. That's how the 35-70 works; 
> the inner tube, which is barely sticking out at the long end on both 
> lenses, extends out as the lens zooms wider.
> 
> This is the reverse of almost all zooms, and Oly took advantage of it in 
> their hood design. The hood is a slip on that clamps onto the outer 
> ring. Thus the front element moved forward within the hood as it zooms 
> wider, rather than taking the hood with it.
> 
> In this way, the hood actually adjusts to the angle of view of the lens 
> as it zooms. Assuming your lens works in a similar way, you may be sure 
> that the original hood would have been a slip on. I would be looking for 
> a 35-70/3.6 hood, which should fit the wider diameter of the outer ring, 
> then trimming the length as needed.
> 
> I'd first work with a cardboard or stiff paper tube to determine the 
> correct length. It won't look original or elegant, but should look 
> pretty decent if cut carefully. The rubber is sturdy enough  for the 
> purpose.
> 
> Moose
> 
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