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12-11-2011, 02:43 PM   #1
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f* or fa* 300mm performance

......


Last edited by Azzy; 08-12-2012 at 10:15 AM.
12-11-2011, 03:09 PM   #2
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I've seen some pictures from 300mm club and I was expecting performance close to this :
Full-size sample photos from Nikon 300mm F/4

I couldn't find Pentax on the site but I think Nikon is the closest
12-11-2011, 06:29 PM   #3
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I've had both the FA* and F*300/4.5, optically they are pretty much the same: very sharp right from F4.5, and no much difference when stopped down up to F8, I mean they are just sharp all the way.

The DA*300/4 is about as sharp as the F/FA*300/4.5 when stopped down to F4.5, but it underexposes a bit at F4. The bokeh is smoother from the newer DA*300, and it doesn't produce as much CA (or purple fringe or whatever it's called) on high contrast area as the earlier F/FA*300 when shoot at wide aperture. Plus it can focus down to 1.4m, a big plus when you really want to shoot something closeup (flowers, butterflies and etc.)
12-11-2011, 06:29 PM   #4
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I'd love to see some samples.

12-11-2011, 06:40 PM   #5
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Gonna try to take some more pictures again tomorrow now that the focus has been adjusted....as long as the weather permits
12-12-2011, 04:52 PM   #6
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Same glow still present:
http://dl.dropbox.com/u/21574465/300/IMGP3138.jpg


Can anyone kindly provide a wide open full size sample from either of these 2 lens

also edited original post and posted cropped images for easier viewing

Last edited by Azzy; 12-13-2011 at 02:44 PM.
12-15-2011, 12:32 AM   #7
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My F* 300/4.5 was damn sharp right from wide open. Two possible problems with your copy:

- Focus is off. Please use manual focusing on a non-moving target and see if the focus improves
- Misalignment of one or more of the elements inside.
12-15-2011, 08:45 AM   #8
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would the lens misalignment visible without disassembling the lens ? I've tried to use tripod + static object + MLU + MF and the sharpness does not match 50-135 wide open / my 77 @f2 until F8

12-15-2011, 09:13 AM   #9
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Something is busted on your lens. It looks like the kind of pictures produced when 'haze' is on the elements.

Here's a couple 300mm F* shots:
300mm f/4.5 ISO 100 1/500th

300mm f/4.5 ISO 100 1/800th
12-15-2011, 09:47 AM   #10
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QuoteQuote:
- Focus is off. Please use manual focusing on a non-moving target and see if the focus improves
- Misalignment of one or more of the elements inside.

Read more at: https://www.pentaxforums.com/forums/pentax-slr-lens-discussion/168224-f-fa-30...#ixzz1gcdyYl2r
Agree with this. Mine is very sharp wide open. You may have to get your copy checked out professionally
12-15-2011, 11:01 AM   #11
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Sent it out for repair today...hopefully it wont be too expensive
12-15-2011, 02:41 PM   #12
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QuoteOriginally posted by Azzy Quote
Sent it out for repair today...hopefully it wont be too expensive
Its a great lens, very compact and delivers excellent IQ. The bokeh can be a bit rough at some settings and once in a great while there is some PF. You will find it well worth repairing.
12-15-2011, 06:02 PM   #13
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1/1000 sec, f/6.3, 300mm, iso 500, 0 Ev, SR OFF, hand-held, K20D
Not wide open, I will try to look if I have wide open shots

Pentax F* 300mm f/4.5 -- blog post


Cheers,
Hin
12-15-2011, 06:05 PM   #14
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Pentax F* 300mm f/4.5 with AF 1.7x TC

on fleetweek in San Francisco
Shot hand-held with K20D and AF 1.7x TC

Cheers,
Hin
12-16-2011, 11:55 AM   #15
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thanks for the replies and images. I've seen some stunning images from this lens throughout the year and you can understand how disappointed I was when seeing the results from my copy, even my $100 tamron 70-300 produced better result.
Though to be fair if I don't pixel peep and just use it for web viewing I can see glimpses of this lens performance as shown here:



I made a mistake trusting the seller on this and not protected myself properly on the purchase, it's a hard earned lesson I guess. Hopefully the lens repair cost is not too expensive.
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