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FORUMS Canon Cameras, Lenses & Accessories Canon EF and EF-S Lenses 
Thread started 15 Apr 2010 (Thursday) 20:54
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Poor man's 500mm

 
DreDaze
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Apr 25, 2010 14:37 |  #91

Brain Mechanic wrote in post #10062916 (external link)
Im comfused...is a t-mount adapter the same as a m42??

Im looking at the Samyang lens in B/H, does the m-42 with AF confirmation work with it?

i'm not sure on the t-mount...basically i bought my lens with the mount already on it, and i just figured it was a strictly canon mount...however afer taking it apart the other day i realized that it seemed like an m42 screw mount(i didn't have any experience with these, just pictures)...so i decided to take a shot and buy an AF confirm mount, and see if it would just screw on...it does so that's how i'm able to get the AF confirm for fairly cheap...if you could find a tamron with the pentax mount you could do the same thing...i'm not sure on the quality of the samyang...as far as i remember the tamron is good, the sigma 600mm, and the canon FD...not sure if the others are worth it


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Madweasel
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Apr 25, 2010 15:07 as a reply to  @ DreDaze's post |  #92

I used to own a few mirror lenses. They're certainly the cheapest way to get some high magnification, but as others have said they can often suffer from low contrast. In the pic below I have (left to right): Rubinar 500/5.6; MTO 1100/10.5; Tamron 350/5.6; Tamron 500/8. The two Tamrons were good - the 350mm in particular had a good reputation. The Russian ones were less good, but the 1100mm was useful when you really wanted maximum power.

Often in use the low contrast is just a natural consequence of looking at distant subjects. The atmosphere itself is what is reducing contrast (and heat turbulence can contribute to a "soft" looking image too).

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Jason ­ C
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Apr 25, 2010 17:26 |  #93

lannes wrote in post #10061175 (external link)
Don't get one, these are soft, they are Korean made and are a copy of the Samyang, a friend had one and we tested it.
It is a waste of time, the bottom of a coke bottle is a sharper lens.

For a Canon DSLR I would only consider the Sigma, Tamron, Nikon and Canon and maybe the Tokina

For me the lure of a 600mm CAT lens - is that it is so cheap, compact and performs well in good light, I could never justify the Canon 600mm f/4.0L for $8k, as well as the small trailer to lug it around. The ultimate would be to get focus confirmation to work for my lens.

It was a brief consideration. I half hoped that perhaps one of those licensed Korean models might have been a sleeper, as was the Rokinon 85mm f/1.4 lens I had owned.

Honestly, I don't think I'd really need 500mm fl, even just for fun, I rarely use the 70-200 f/4 L I own.

I got carried away, and perhaps I should be carried away...;)

Whatever the case may be, kudos for everyone giving this thread experience and great samples of the cats.

Jason C


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Madweasel
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Apr 25, 2010 17:39 |  #94

One more consideration when comparing mirror lenses between manufacturers is that there seems to be no consistency in taking into account the obstruction of the secondary mirror when quoting f/ratio. The Tamron 500mm f/8 is physically fatter than some other 500/8s, which makes me think Tamron does account for it, at least more than some others. Also if you look at my picture above, the furthest left is supposed to be a stop faster than the furthest right, both 500mm lenses, but it doesn't look 40% fatter, which it would if they accounted for the obstruction (which moreover is bigger on the faster lens).


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lannes
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Apr 25, 2010 19:21 |  #95

DreDaze wrote in post #10062186 (external link)
i was able to pick up an m42 adapter for my tamron adaptall...and it has AF confirm...it's kinda fun to be able to use it now, i can actually focus just thru the viewfinder...

Does it help or is a split ring better ?

I've ordered a FD/EF mount, with some eletronics to provide focus confirmation, but it hasn't arrived yet.


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lannes
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Apr 25, 2010 19:24 |  #96

Brain Mechanic wrote in post #10062916 (external link)
Im looking at the Samyang lens in B/H, does the m-42 with AF confirmation work with it?

Don't get the Samyang you'll be disappointed with the image quality, there are better secondhand CAT lenses out there for around the same price.
That is why I went with the Canon FD version, even with the FD/EF converter on, it is still significantly sharper than the Samyang and it's rebadged clones (Vivitar Series 1etc.)


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Apr 29, 2010 13:36 |  #97

GOGGLES. Oh. My. I've heard to the Zeiss Mirortar being the gold--nay--platinum standard for mirror lenses, but have never seen one. Just found this on Ebay. It comes with bellows for Pete's sake! Wow.

http://cgi.ebay.com …-Carl-Zeiss-/230406546376 (external link)


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Apr 29, 2010 13:48 |  #98

jblaschke wrote in post #10089963 (external link)
GOGGLES. Oh. My. I've heard to the Zeiss Mirortar being the gold--nay--platinum standard for mirror lenses, but have never seen one. Just found this on Ebay. It comes with bellows for Pete's sake! Wow.

http://cgi.ebay.com …-Carl-Zeiss-/230406546376 (external link)

Must be macro focusing. I don't think it will fit in a coat pocket--and didn't they make 1000mm version? Wonder what that would cost?


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jblaschke
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Apr 29, 2010 13:59 as a reply to  @ advaitin's post |  #99

That bad boy is f/4.5! My Meade 645 is f/5, and that's considered a blazing fast telescope for astrophotography. Zeiss doesn't mess around.


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moreover
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Apr 29, 2010 15:15 |  #100

My "not so poor" man solution was to buy a used Nikon 300mm f/2.8 AIS (a 1985 sports reporter lens) and an adapter on a T2i to get a superb 500mm f/2.8 lens
The photo below was actually taken Sunday with my 5dm2 (Nation author John Nichols talking about "The Life and Death of American Journalism")

IMAGE: http://juc-photos.smugmug.com/Other/Nichols-McChesney/IMG0489/851716652_q9GAX-L.jpg



  
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440roadrunner
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Apr 29, 2010 15:30 |  #101
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Brain Mechanic wrote in post #10062916 (external link)
Im comfused...is a t-mount adapter the same as a m42??

Im looking at the Samyang lens in B/H, does the m-42 with AF confirmation work with it?

Absolutely not.

First, a threaded T mount is in fact the same DIAMETER (42mm) but the thread pitch is different.

Second, if you have a lens with a T mount 42mm thread, it needs an adapter to make up the proper register difference, to put the lens in the proper place in relation to the sensor/ film to focus

Here's an example:

http://cgi.ebay.com …ories&hash=item​35a8cf38d1 (external link)

This is a two piece ring, with 42mm T mount threads INSIDE, and M42 Pentax threads on the OUTSIDE.

You thread this onto your T mount lens, then screw that combo into the camera. The two rings have setscrews so you can rotate the two rings and set your lens "right side up."

T (Actually T-2) mount adapters do not HAVE to have M42 camera mounts. You can buy them directly to Canon EF:

An example:

http://cgi.ebay.com …ories&hash=item​4cec7f9290 (external link)

Once again, you have the T/ T2 42mm inside threads, the two rings with setscrews, but now the camera end fits directly to your Canon EF mount body


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rx7speed
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Apr 29, 2010 15:44 |  #102

t-mount is an adaptable mount. it has screws like a m42 and will even thread into an m42 mount about 3/4 of a thread but they are not compatible.

m42 is also known as the pentax screw mount used before the pentax K mount came about. it can be converted to EOS mount with an adaptor, but can't be adapted to many other cameras.


tmount on the other hand is not camera specific and instead you can mount it to more or less anything if you get the proper adaptor. it's a nice universal mount :-)


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jblaschke
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Apr 30, 2010 12:04 as a reply to  @ rx7speed's post |  #103

Just to chip in, T-mount adapters are the default adapter for through-the-telescope astrophotography, if you you're using a DSLR. I had one from the 80s I'd used with my folks' AE-1, which I sold on Ebay a couple of years ago and used the cash to by one in the EOS mount for my XTi. I think I actually made a few cents profit on the exchange. :)


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Madweasel
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Apr 30, 2010 15:37 |  #104

advaitin wrote in post #10090042 (external link)
Must be macro focusing. I don't think it will fit in a coat pocket--and didn't they make 1000mm version? Wonder what that would cost?

Yes they did, and it was f/5.6. It had the highest MTF of any production lens and as you suspect cost a fortune.


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corkneyfonz
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Apr 30, 2010 18:38 |  #105

I had a third party 500mm f8 mirror in the 80's on my T70. The biggest problem was hand holding as using the reciprocal focal length formula you need 1/500 sec shutter speed. On a crop body you're looking at 800mm or 1/750 or thereabouts. Whilst I initially liked the doughnut bokeh, it soon became an irritating lens signature. Living in good old Blighty, we are rarely blessed with constant sunshine and count cloud as a blessing. One recent cloudy nifty 50mm shot was hand held at 1/30 at f16 iso 400. If my sums correct I could expect 1/125 at f8 which means raising iso to at least iso 1600 for a 1/500 sec hand holding shutter speed and going up to iso 3200 for a crop body. So my point is that unless you are blessed with good light both for focussing and exposing or use support then these are not the bargain they may first appear. In the end despite never being exposed to rain my mirror got attacked by an internal focus and I managed to get my money back.


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Poor man's 500mm
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