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Old Feb 4, 2007, 7:49 AM   #11
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2X converter... crappy thing, never should have used it...
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Old Feb 4, 2007, 8:44 AM   #12
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bilybianca wrote:
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2X converter... crappy thing, never should have used it...
LOL!! :-)
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Old Feb 4, 2007, 9:54 AM   #13
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bilybianca wrote:
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2X converter... crappy thing, never should have used it...
which 2x and what lens?

roy
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Old Feb 4, 2007, 10:23 AM   #14
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robar wrote:
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bilybianca wrote:
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2X converter... crappy thing, never should have used it...
which 2x and what lens?

roy
Some lousy Pentax crap... let me read on it... SMC-A* 200 mm 2.8 and Rear Converter A 2XS...

Kjell

(well, my point was that there are crappy 2Xconverters, but you mustn't be to hasty to write them all off, like Hayward does)
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Old Feb 4, 2007, 2:59 PM   #15
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I did not intend to imply ALL 2x or greater converters are bad, but often there is decernable differences at that point and beyond with mostI have seen, where as the 1.4/5x are usually much more less noticeable difference.

It of course also makes a difference what lens you are trying to magnify. 2 and 3x often work just fine on short lenses, but more problematic on long ones.

Just one person's opinion its not intended to be gospel.
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Old Feb 4, 2007, 3:39 PM   #16
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OK, here's a question; I can understand how a teleconverter can cause a loss of sharpness due to trying to pull more detail out of a smaller section of the lens than it was designed to pull in, but what I'm wondering is that since you are using a smaller area of the lens, is using a teleconverter like using a smaller aperture not just in brightness, but also in quality? Will it tend to reduce aberration like you normally would be shrinking the aperture, or are you actually amplifying it?
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Old Feb 4, 2007, 4:01 PM   #17
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Hayward wrote:
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It of course also makes a difference what lens you are trying to magnify. 2 and 3x often work just fine on short lenses, but more problematic on long ones.
So here's a crappy try with a 600 mm lens and the same converter... cropped...

(sorry to hijack the thread, inneyeseakay, but someone has to do it...)
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Old Feb 4, 2007, 4:22 PM   #18
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bilybianca wrote:
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Hayward wrote:
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It of course also makes a difference what lens you are trying to magnify. 2 and 3x often work just fine on short lenses, but more problematic on long ones.
So here's a crappy try with a 600 mm lens and the same converter... cropped...

(sorry to hijack the thread, inneyeseakay, but someone has to do it...)
like i said i'm relatively happywith the tamron 2x but from examples i think i'd be happier with the 1.4-5.. this shot???? tak500mm at f8 with 2X TC
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Old Feb 4, 2007, 4:30 PM   #19
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robar wrote:
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this isan old trick that i posted a couple years ago. mntgal has one and so does ira. the easiest way to get the glass out is use a small hammer.. unless your's is like ira's and meant to be removable.
Actually on my Tamron... their was a large threaded ring on the backholding all of the glass elements in, if I would have had to take a hammer to it I would've never done it... lol.

If your is like mine... flip it over and you will see two notches on the innermost ring. Simply press a small flathead into one of those notches and "unscrew" that large ring... Once unscrewed, take the ring off and a couple of elements will follow. There might be a couple that don't want to come out, but just push them from the front with a ink pen or something and they will come right out.

This is what the ring looks like. The one in the picture is actually a second ring... The one you want to remove is the next closest one to the center.
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Old Feb 4, 2007, 4:32 PM   #20
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I'd really like an extension tube of this sort, auto aperture must be very convenient.

Kjell
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