On a 5D! - you have a few friends here.
The hood - The hood for the 24mm F2 would be the one as it has to be
designed for the minimum zoom range (only the brilliant 35-70mm F3.6
got around that problem). The one for the 28-48mm might do the job.
But, given the bent filter ring, that's a problem - the closest clamp-
on hoods are the rubber hoods for the 35-70mm F4 and 35-105mm but
they will almost certainly vignette on full frame. I can let you have
a 35-105mm rubber one if you feel like hacking yourself a rubber tulip!
Sigma made a range of 'Perfect' hoods - plastic tulips which will
clip in and wouldn't be bothered by the ding. There should be one at
55mm width that will suit 24mm. One of the cheap Chinese ones offered
on ebay might do the job too. Those are trial and error solutions.
Best of all - any old lens repairer should have a neat reverse vice
device which will restore the rim to true round. As it opens, , irt
pushes the ring back into shape with minimum damage to threads and
anodised finish. It's worth getting it done right. Personally, for
the occasional rough repair, I made myself a set of wooden forms in
49/52/55/58 sizes - with a small hammer and a shaped wooden flat peg
I can tap the ding out of most lenses to the point where I can mount
a filter. Sometimes the alloy is too hard though. It's a crude and
nervous approach - for a precious lens I'd get it done properly.
Andrew Fildes
afildes@xxxxxxxxxxxxx
On 30/03/2008, at 5:27 AM, Paul Yates wrote:
> You're welcome!
>
> The first few samples I've shot show great performance at 24mm f8-f11.
> Sharp into the corners of my 5D.
>
> The haze/low contrast issue can be dealt with relatively well in
> PP, but
> I'd really prefer to clean it up.
>
> Some samples later, perhaps.
>
>
> -Paul
>
> Chris Barker wrote:
>> That looks very pretty, Paul. Thanks for the information and photos.
>>
>> Chris
>>
>>
>> On 29 Mar 2008, at 16:57, Paul Yates wrote:
>>
>>> It has arrived!
>>>
>>> Based on my preliminary analysis and measurements, I can confirm
>>> with
>>> nearly 100% certainty that this lens is a prototype based on the
>>> design
>>> in the patent discussed earlier. In the patent, it states a filter
>>> size
>>> of "about 55mm". This lens has a 55mm filter diameter, which is
>>> simply
>>> one more piece of supporting evidence on top of what I discussed
>>> earlier.
>> snip
>>
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