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How to tell if you have a dud lens?

post #1 of 11
Thread Starter 
I bought a 500mm lens here: http://www.adorama.com/SY5008XX.html...point0Product1

However I can't get any focus at all. I even tried to record a video, on a tripod, set to a target at about 150 feet, then used the entire range of focus. never once did i get a good clear frame.

Using Canon T2i and the required T mount for the lens.
    
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post #2 of 11
I thought I was having problems with my 50mm, turns out that I was letting the camera choose my autofocus point. I fixed that, it worked great.

In your case, not exactly possible since this is a MF only lens -- one tihng you could try is using Live view and going to 7x and seeing if you can adjust the focus that way, then leave live view and snap the pic?
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post #3 of 11

To be honest i dislike cat lenses...they died with the old manual winders(AE1P) they have terrible image quality and best serve a on body telescope and nothing more. Return this lens and go for a Tokina or Tamron. you will be thoroughly please with the difference. I would know...when i was 21 i was broke and wanted a tele so i bought a crap 500mm cat lens for some aerial photography and everything was out of focus just enought that when i enlarged them it showed like a scratch on a black car.

Your camera does not have a focusing screen which will make it difficult to focus.

Look at these two lenses:

Tamron




Tokina

price for Tokina

Yes they are low end sub-$1k lenses but they will do the trick for certain
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post #4 of 11
I'm not sure if its a dud or not since the page says 'article not found', but the O in the ADORAMA logo sure looks like the logo from Aperture Laboratories.

Just saying.
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post #5 of 11
Thread Starter 
Quote:
Originally Posted by Ctrl+Alt+Del View Post
To be honest i dislike cat lenses...they died with the old manual winders(AE1P) they have terrible image quality and best serve a on body telescope and nothing more. Return this lens and go for a Tokina or Tamron. you will be thoroughly please with the difference. I would know...when i was 21 i was broke and wanted a tele so i bought a crap 500mm cat lens for some aerial photography and everything was out of focus just enought that when i enlarged them it showed like a scratch on a black car.

Your camera does not have a focusing screen which will make it difficult to focus.

Look at these two lenses:

Tamron

price for Tamron



Tokina

price for Tokina

Yes they are low end sub-$1k lenses but they will do the trick for certain
Yikes, one of them is a bit more than what T2i retails new. I'll have to return the one I got since it seems a crap to begin with.
    
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post #6 of 11
That's what you get with mirror lenses.

I did a thorough review for B&H on several of them, including the 2x adapters.

If you want the short results - a 150$ Canon 75-300mm w/2x converter looked better than the 800mm w/2x converter.

But the REAL kicker is the focus!

It takes around 5-10x the time to properly focus the lens.

And even then, it's NEVER going to be nearly as sharp as a regular non-mirror lens.

This is because these days, mirror-lenses have become a bit of a niche item and they're only manufactured by cheap Chinese companies.

There is a good Sony-mount mirror-lens for around 800$, and it would be nice if everyone followed suit because it's the only technology for long zoom without 2-foot lenses.
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post #7 of 11
Quote:
Originally Posted by Track View Post
That's what you get with mirror lenses.

I did a thorough review for B&H on several of them, including the 2x adapters.

If you want the short results - a 150$ Canon 75-300mm w/2x converter looked better than the 800mm w/2x converter.

But the REAL kicker is the focus!

It takes around 5-10x the time to properly focus the lens.

And even then, it's NEVER going to be nearly as sharp as a regular non-mirror lens.

This is because these days, mirror-lenses have become a bit of a niche item and they're only manufactured by cheap Chinese companies.

There is a good Sony-mount mirror-lens for around 800$, and it would be nice if everyone followed suit because it's the only technology for long zoom without 2-foot lenses.
They also produce very bizarre "doughnut" bokeh highlights (as you probably know).
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post #8 of 11
Quote:
Originally Posted by GoneTomorrow View Post
They also produce very bizarre "doughnut" bokeh highlights (as you probably know).
And that's the reason why no high-end company want to make them
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post #9 of 11
I learn more about photography here than I do computers, just sayin.
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post #10 of 11
Quote:
Originally Posted by Tw34k View Post
I learn more about photography here than I do computers, just sayin.
You should check all my latest posts in my user profile
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