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04-28-2008, 06:34 PM   #16
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the lens actually has 1:4 magnification like the 50-200, which isn't too shabby. can be considered as "Close Focus"

04-28-2008, 06:55 PM   #17
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Wow thanks again Ed!

Hmm time to start saving up. I was just wondering. Does the lens hood have the same pull out hatch for filter access as they did for the DA50-200?
04-28-2008, 07:34 PM   #18
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QuoteOriginally posted by FotoPete Quote

Does the lens hood have the same pull out hatch for filter access as they did for the DA50-200?

Yes, it is there.
04-29-2008, 05:38 PM   #19
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QuoteOriginally posted by ftpaddict Quote
1.4m at 300mm is not that far away.
Same distance as 1.4m at 55mm really.

04-29-2008, 05:41 PM   #20
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QuoteOriginally posted by Ed in GA Quote
f-stop progession is:

f/4 55 - 120
f/4.5 120 - 210
f/5.6 210 - 290
f/5.8 290 - 300
So at 80mm it's faster than my 80-320/4.5-5.6.
At 300mm it's slower. Boy, I can never work out how these things work!
04-29-2008, 10:06 PM   #21
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QuoteOriginally posted by Ed in GA Quote
f-stop progession is:

f/4 55 - 120

f/4.5 120 - 210

f/5.6 210 - 290

f/5.8 290 - 300
Nice. I was expecting f/4.5 to appear by 70mm or so and also surprised that the 5.8 only appears at the extreme (not that the difference between 5.6 and 5.8 is very meaningful).

On the DA 50-200 it is:

f/4: 50-58
f/4.5: 58-138
f/5.6: 138-200

I didn't think I was going to want this lens. More and more though my resistance is weakening.

Can anyone with one in their possession confirm whether it has 6 or 8 aperture blades? Also a picture of it mounted on a K10D or K20D would be helpful.
04-30-2008, 03:42 AM   #22
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QuoteOriginally posted by AndrewG NY Quote
Can anyone with one in their possession confirm whether it has 6 or 8 aperture blades? Also a picture of it mounted on a K10D or K20D would be helpful.
According to Pentax's site, the DA 55-300 has 6 blades.
Pentax Imaging -
Personally, since seeing the 55-300 it looks exactly like the old FAJ 75-300 (minus the plastic mount). The FAJ also has 6 blades and the almost the same aperture range f/4.5 to 5.8.

-
04-30-2008, 07:21 AM   #23
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QuoteOriginally posted by metalfab Quote
According to Pentax's site, the DA 55-300 has 6 blades.
Pentax Imaging -
Personally, since seeing the 55-300 it looks exactly like the old FAJ 75-300 (minus the plastic mount). The FAJ also has 6 blades and the almost the same aperture range f/4.5 to 5.8.

-
but wasn't the FAJ crap?

04-30-2008, 08:39 AM   #24
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QuoteOriginally posted by k100d Quote
but wasn't the FAJ crap?
No more so than the competittion at the same price point. Still I hope the 55-300 does better. They've had time to improve the design.
04-30-2008, 09:58 AM   #25
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QuoteOriginally posted by k100d Quote
but wasn't the FAJ crap?
I think many were put off by the somewhat cheap-feeling FA-J build (lack of focus distance indicator seems particularly miserly!) but the DA lineup has generally been better in this regard. The elimination of the aperture ring also likely dissuaded many Pentax shooters with older equipment.

The 55-300 has a different optical design as well:
FA-J 75-300: 12 elements in 10 groups
DA 55-300: 12 elements in 8 groups

In addition to the improved minimum focal length, the 55-300 has other improvements including non-rotating front element and quick-shift manual focus.

I am guessing (unconfirmed) that some of the changes may be the result of sacrificing 35mm film full-frame compatibility. That may be the price to pay for improved performance with a relatively compact lens in this class.
04-30-2008, 11:55 AM   #26
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Just to point out that the DA really is a different design, here is the lens diagram for the DA 55-300:

http://kmp.bdimitrov.de/lenses/zooms/_optics/55-300f4-5.8.gif

And here is the FAJ 75-300:

http://kmp.bdimitrov.de/lenses/zooms/_optics/75-300f4.5-5.8.jpg

The front group is similar, but the middle and rear groups are different. Given this info, I would guess that this is a new design or refinement of the FAJ design, not just a recycling/repackaging of it.
04-30-2008, 04:43 PM   #27
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I have the FA J 75-300mm (a non-crap version from what I can tell).
Although i have seen some really crap shots drom some bad examples that are out there.

The FA J 75-300mm is not a bad consumer grade lens. For the price it has reasonable cheap reach.
Although 300 is soft and PF is noticeable.

Looking at ED's other post with test shots that wouldn't normall expose PF considerably ... his DA 55-300mm did not show up any PF at all ... and is quite good at the long end too.

I'd definitely consider replacing my FA J 75-300mm for the DA 55-300mm ... just for the fact of more range ... and it stays at f/4 for quite a decent chunk of the zoom range too.
04-30-2008, 04:49 PM   #28
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QuoteOriginally posted by Arpe Quote
Same distance as 1.4m at 55mm really.
Quite. But the magnification is greater, no?
04-30-2008, 06:06 PM   #29
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Ah yes, quite so. just pulling ya leg.
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