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Re: [OM] OM to EOS adapter, Now Other Adapter Advice

Subject: Re: [OM] OM to EOS adapter, Now Other Adapter Advice
From: "Jim Nichols" <jhnichols@xxxxxxxxxxxxx>
Date: Thu, 10 Mar 2011 08:26:21 -0600
Hi Chuck,

Business-wise, Fotodiox is great.  It is just, in my opinion, that this 
particular adapter design was poorly conceived.  Many of their products are 
fine.

Jim Nichols
Tullahoma, TN USA
----- Original Message ----- 
From: "Chuck Norcutt" <chucknorcutt@xxxxxxxxxxxxxxxx>
To: "Olympus Camera Discussion" <olympus@xxxxxxxxxxxxxxxxx>
Sent: Thursday, March 10, 2011 6:29 AM
Subject: Re: [OM] OM to EOS adapter, Now Other Adapter Advice


> If Fotodiox is a reputable supplier why is it that their two part mount
> design tends to come apart?  :-)
>
> Chuck Norcutt
>
>
> On 3/9/2011 9:59 PM, Jim Nichols wrote:
>> Hi Moose,
>>
>> I don't think this applies to the OM to EF adapters, but I found it in
>> Pentax to 4/3 and Leica-R to 4/3, so, just a word of advice.  These 
>> adapters
>> are made in two parts, one that attaches to a 4/3 body, and another that
>> provides the thickness and attachment for the specified lens system.  My
>> Pentax to 4/3 adapter came from Fotodiox, a reputable US supplier.  The 
>> two
>> parts are held together by pointed setscrews in the outer rim.  I made 
>> sure
>> these were tight, but, when used with heavier lenses, I found that they
>> loosened up.  Fearing that I would drop a lens, I marked the two halves,
>> placed a few drops of Superglue on the mating surfaces, and carefully
>> realigned and clamped the parts, tightening the rim screws.  In 2+ years 
>> of
>> use, it has never showed signs of loosening up again.
>>
>> My two Leica-R to 4/3 adapters are assembled with Phillips screws in the
>> face surfaces.  I checked to be sure the screws were tight, and have 
>> never
>> had a problem with the two parts attempting to separate.  This seems to 
>> be a
>> more secure arrangement, and is the one that I trust to hold the E-1 body 
>> to
>> the Leica Telyt-R 250/4, where the whole assembly weighs about five 
>> pounds.
>>
>> Just my 2 cents.
>>
>> Jim Nichols
>> Tullahoma, TN USA
>> ----- Original Message -----
>> From: "Moose"<olymoose@xxxxxxxxx>
>> To: "Olympus Camera Discussion"<olympus@xxxxxxxxxxxxxxxxx>
>> Sent: Wednesday, March 09, 2011 7:02 PM
>> Subject: Re: [OM] OM to EOS adapter
>>
>>
>>> On 3/9/2011 11:57 AM, O. H. wrote:
>>>> ...
>>>>
>>>> If you decided to continue reading, I am most probably buying a Canon.
>>>> I would rather go for Nikon but I assume that there are no adapters
>>>> for OM to Nikon available. If there are, please let me know!
>>>
>>> The simple answer is that adapters that you want to use, i.e. simple and
>>> without additional lenses in them, are only
>>> available for 4/3, micro 4/3 and Canon EOS (And perhaps other, more
>>> recent, mirror less cameras?) (The actual name of
>>> the lens mount on EOS cameras is 'EF'.)
>>>
>>> The reason is that the distance from lens mount to film/sensor of all
>>> other the mounts is to long to leave room for the
>>> adapter body between lens and camera body.
>>>
>>>> I would appreciate if you could help me with the following questions:
>>>>
>>>> 1) Is there any OM to EOS adapter that allows the lens to firmly
>>>> attach to the adapter? I already bought a very cheap adapter (to test
>>>> lenses with camera shop's body) and noticed that the lens does not
>>>> lock into the adapter. So when I am rotating the focus ring, the lens
>>>> might fall off! I am seeking an adapter that has a locking mechanism
>>>> with a relief button for the lens. So are there such at all?
>>>
>>> As others have pointed out, your experience is not common. Most adapters
>>> lock properly in both ways, adapter to body and
>>> lens to adapter. The one you bought is faulty, and should be returned.
>>>
>>> Mike and Nathan have pointed out expensive and really expensive models.
>>> I've been completely happy with the cheap one I
>>> bought from China.These are really simple, two piece devices, with one
>>> being the stop down tab screw. There's not a lot
>>> to go wrong.
>>>
>>> Especially as you are just trying this out, I would buy an inexpensive 
>>> one
>>> to start with. Rather than the cheapest one,
>>> from a 25 feedback seller in China Chuck linked to, I'd spend 9¢ more 
>>> and
>>> buy from Big-IS, still in China, but with
>>> excellent feedback on over 20,000 transactions.
>>>
>>> I think if you polled the list, you would find the vast majority of 
>>> those
>>> who have bought inexpensive ones off the 'Bay
>>> have found them fine. I can't imagine in what way mine could be better.
>>>
>>>> 2) Is there any OM to EOS adapter that would NOT allow focus to
>>>> infinity? Such a adapter would be thicker and would allow mostly
>>>> macrophotography (that would be OK with me). Such an adaptor could
>>>> much easily have good locking mechanism.
>>>
>>> Never heard of such a thing. There are at least three reasons:
>>>
>>> 1. Not necessary. Even very inexpensive adapters that focus to infinity
>>> lock properly. If you look at how the locks
>>> work, it is quite simple to implement.
>>>
>>> 2. No one would intentionally buy into such trouble. No matter how you
>>> warn them, some folks would buy them, then
>>> complain that they didn't "focus right".
>>>
>>> 3. A proper adapter and extension tubes is much more flexible.
>>>
>>>> 3) Is there any OM to EOS adapter that would change the aperture as I
>>>> turn the aperture ring? I mean similarly as in Olympus OM to 4/3
>>>> adapter. The cheap OM to EOS adapter I bought, I have to manually
>>>> press the depth of field preview button so that the aperture sets to
>>>> correct. Well, this is good for focusing, but for macrophotography
>>>> aspects I would rather have similar action as with OM to 4/3 adapter.
>>>
>>> As someone else has pointed out, the way you want it to work is the way
>>> the vast majority of adapters work. Again, you
>>> bought a bad model/design.
>>>
>>>> 4) Do you find the OM to EOS adapters basically OK for use? With this
>>>> I mostly mean that are the Canon bodies really good at measuring the
>>>> exposure?
>>>
>>> No, the simple ones can't be relied on for correct exposure with all
>>> lenses at all apertures. It appears the camera
>>> needs to know the focal length and/or aperture to correctly interpret 
>>> the
>>> light falling on it.
>>>
>>> This is true of Oly 4/3 camera bodies, as well. When they first,
>>> reluctantly, brought out an OM=>4/3 adapter, they only
>>> approved it for a limited set of OM mount Zuikos. Later, they came out
>>> with a table showing EV adjustments necessary for
>>> many others, aperture by aperture.
>>>
>>> When I got my first DSLR, a Canon 300D, and a hand machined adapter
>>> (unlike anything you will see today!), I did some
>>> simple testing with a 50/1.4 Zuiko. Auto exposure was uneven, tending to
>>> overexposure as the lens opened up. Manual
>>> exposure was much better, only slightly brighter at f1.4.
>>>
>>> With Sigma 600/8, for a more extreme case, my 5D needs something like 
>>> two
>>> stops less exposure than the meter says. For
>>> slow work like much landscape, macro, etc. it's not a big deal, as one
>>> shoots. looks at the LCD, adjusts, shoots again .
>>> . . And for repeated setups, maybe take notes. Remember, test shots 
>>> later
>>> deleted have almost no cost at all.
>>>
>>> There are adapters with chips that connect to the AF system to confirm
>>> correct focus. The fancier ones allow you to
>>> program them using the camera so they report the correct focal length 
>>> when
>>> you shoot. I've heard it claimed that they
>>> make auto exposure more accurate. I don't know myself.
>>>
>>>> 5) Once again: are there any adapters (without changing parts of the
>>>> lens) to fit OM lens to Nikon? I don't really need focus to infinity.
>>>
>>> No there aren't, other than the mount replacements Mike referenced. And
>>> yes you do need infinity focus. Unless you are
>>> one in many million. You are going to want it sooner, rather than later.
>>>
>>> I started with Zuikos on my Canon DSLRs and one basic Canon auto lens 
>>> for
>>> casual use. I now I almost never use OM mount
>>> lenses on it except for specialty uses, like the super teles, the macro
>>> lenses with tube or bellows, etc. BTW, the
>>> Tamron 90/2.8 is a really excellent and reasonably priced auto macro 
>>> lens
>>> available in EOS mount.
>>>
>>> Moose
>>> --
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>>>
>>>
>>
>>
> -- 
> _________________________________________________________________
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>
>
> 


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