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10-01-2008, 07:28 AM   #1
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Quality between 2 lenses...

So I'm looking at getting the 50-135mm* lens, but then I noticed there's a 55-300. ON one website it has the star by it and the other it doesn't. It's at an f4 (55-300), but I'm wondering if the glass quality is the same. ANyone know? THanks.

10-01-2008, 07:38 AM   #2
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QuoteOriginally posted by mchud Quote
So I'm looking at getting the 50-135mm* lens, but then I noticed there's a 55-300. ON one website it has the star by it and the other it doesn't. It's at an f4 (55-300), but I'm wondering if the glass quality is the same. ANyone know? THanks.
The DA55-300 is not a * lens, and is not a constant aperture zoom (it is f/4 at 55mm, and changes progressively to f/5.8 at 300mm).

It and the DA*50-135 are not really comparable. The latter is constant f/2.8, weather-sealed, and features SDM (in-lens) autofocus motorization.
10-01-2008, 07:41 AM   #3
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The DA* is a higher grade of lens than the DA line in terms of features and price.

The DA* is giving you a wider, constant aperture, weathersealing and SDM, as well as being a 2.7x zoom.

The DA is variable aperture starting at f4, no weathersealing, no SDM, and is a 5.4x zoom.

Both lenses are highly rated, but have different applications. The 50-135 is a midrange telephoto, and the 55-300 is a mid-long telephoto.
10-01-2008, 08:15 AM   #4
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Great. That's what I needed to know. Thanks.

10-01-2008, 09:08 AM   #5
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QuoteOriginally posted by RBellavance Quote
The DA55-300 is not a * lens, and is not a constant aperture zoom (it is f/4 at 55mm, and changes progressively to f/5.8 at 300mm).
just a side note - I have read that it is f4 until 100mm and 4.5 until 200mm, correct me if I am wrong.
10-01-2008, 09:19 AM   #6
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QuoteOriginally posted by deejjjaaaa Quote
just a side note - I have read that it is f4 until 100mm and 4.5 until 200mm, correct me if I am wrong.
I have no idea, as I don't own it
10-01-2008, 09:30 AM   #7
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QuoteOriginally posted by deejjjaaaa Quote
just a side note - I have read that it is f4 until 100mm and 4.5 until 200mm, correct me if I am wrong.
EXIF data may show discrete steps, but the aperture changes gradually as you zoom. I am sure that the EXIF would really be confusing if you got apertures such as f/4.78599832002 when you were zoomed to 163 mm.

Last edited by Canada_Rockies; 10-01-2008 at 09:36 AM.
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