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Forum: Digital Processing, Software, and Printing
10-18-2022, 02:02 PM
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Are you sure that your current CPU is the limiting factor? Does your current setup provide sufficient cooling to prevent CPU throttling?
Unless the comparative CPU benchmarks were obtained using RT, which I imagine they were not, you may not realise the anticipated gains in practice.
Are you using your SSD to host your swap and RT cache files?
A better GPU, as suggested by Markovo, is unlikely to help as RT does not seem to have the ability to off-load image processing tasks to it.
Why not save money and batch process your files overnight?
If you are really desperate for a faster throughput, why not go the whole hog and upgrade to a Ryzen 7 Zen 4 platform: not immediately, but in the New Year when prices are likely to have come down?
Decisions, decisions 😁
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Forum: Lens Clubs
04-04-2022, 09:24 AM
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SMC Pentax-A 50mm f/1.4, back from a clean and service (courtesy of Peter Emanuel Asahi Photo – Pentax Repair and Service), with Pentax-K3 III. Cropped, but otherwise straight from camera JPEG.
Old, but still a keeper, in my opinion :)
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Forum: Lens Clubs
04-04-2022, 08:19 AM
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and with a Pentax-K3 III of all things:eek:
Might just hang on to this old lens after all :)
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Forum: Lens Clubs
06-21-2021, 10:50 AM
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Male Emerald (Willow?) Damselfly. K-3 with SMC Pentax-FA* 200mm F2.8 ED [IF] - one of my 'go to' lenses for butterflies, dragonflies and, as in this image, damselflies.
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Forum: Lens Clubs
05-20-2021, 12:16 PM
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Hope the young ones like legs!
Taken hand-held with a Tamron 70-200mm F2.8 Di LD Macro (you know, the one with the lousy AF) mounted on a Pentax K-3.
Thanks for looking ;)
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Forum: Lens Clubs
05-20-2021, 11:31 AM
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Not a mint leaf beetle, as I had first supposed, but Cryptocephalus aureolus, which has no common name.
Pentax K-3 with Tamron 70-200mm F2.8 Di LD Macro
Thanks for looking ;-)
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Forum: Lens Clubs
05-20-2021, 11:24 AM
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The image of the Yellow wagtail was taken hand-held. The others were taken with the aid of a tripod-mounted gimbal head.
Thanks for looking ;)
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Forum: Lens Clubs
05-20-2021, 11:18 AM
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Forum: Pentax SLR Lens Discussion
06-03-2012, 08:20 AM
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The Sigma 24mm f/2.8 Super-Wide II would be a good choice. Here is a comparison with the 35mm f/2.4 DA-L (both at maximum aperture):
[/url] [url=http://www.flickr.com/photos/garrulusapis/7074526511/]Sigma 24mm Super Wide II F2.8[/url] by [url=http://www.flickr.com/people/garrulusapis/]Dr 'B '[/url], on Flickr" target="_blank"> Sigma 24mm Super Wide II F2.8 by Dr 'B ', on Flickr
[/url] [url=http://www.flickr.com/photos/garrulusapis/7074512749/]SMC Pentax-DA 35mm AL F2.4[/url] by [url=http://www.flickr.com/people/garrulusapis/]Dr 'B '[/url], on Flickr" target="_blank"> SMC Pentax-DA 35mm AL F2.4 by Dr 'B ', on Flickr
To compare results at other apertures see here: Pentax-fit prime lens comparison (24 - 55mm) - a set on Flickr
IMHO, both are fine lenses capable of producing equally fine, but different, results.
Jon ;)
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Forum: Pentax SLR Lens Discussion
06-03-2012, 08:06 AM
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+1 in every respect, Mark - and, just to prove the point, here are some images captured with said 'kit' lens.
[/url] [url=http://www.flickr.com/photos/garrulusapis/5889304080/]Malachite (Siproeta stelenes) - wings closed[/url] by [url=http://www.flickr.com/people/garrulusapis/]Dr 'B '[/url], on Flickr" target="_blank"> Malachite (Siproeta stelenes) - wings closed by Dr 'B ', on Flickr
[/url] [url=http://www.flickr.com/photos/garrulusapis/5889305350/]Blue Morpho (Morpho peleides) - wings closed[/url] by [url=http://www.flickr.com/people/garrulusapis/]Dr 'B '[/url], on Flickr" target="_blank"> Blue Morpho (Morpho peleides) - wings closed by Dr 'B ', on Flickr
[/url] [url=http://www.flickr.com/photos/garrulusapis/5888735381/]Blue Morpho (Morpho peleides) - wings open[/url] by [url=http://www.flickr.com/people/garrulusapis/]Dr 'B '[/url], on Flickr" target="_blank"> Blue Morpho (Morpho peleides) - wings open by Dr 'B ', on Flickr
Jon ;)
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Forum: Lens Clubs
05-27-2012, 12:22 PM
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Drat: foiled again! How could you tell, Pepe?
Seriously, I goofed when posting, something a kind moderator has now sorted, but I must say it was very generous of you to comment so favourably, rather than just sending me a string of invective and abuse for messing with your thread :eek:
Kind regards,
Jon ;)
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Forum: Lens Clubs
05-27-2012, 07:50 AM
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Forum: Post Your Photos!
05-27-2012, 07:04 AM
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Cheers all: your comments are much appreciated :D
Here is a second image in the same set taken from a different viewpoint and using a smaller aperture (f/11) to retain detail in the entire flower head.
 Yellow Poppy II by Dr 'B ', on Flickr
"slackercruster V. Nice. What gave you that border effect?"
Simple: select all, contract x pixels, feather x pixels, select inverse, delete et Voilá!
Notes: I always leave this step till last and, if layers have been used, the image must be flattened first. On an unresized image from either the K20D or K5, a good starting point is to contract by 100 pixels and then feather by 66. This, naturally, can be modified to suit the image size but I tend to maintain the 3:2 (contract:feather) ratio as this gives the effect I find most pleasing. The fade to white is obtained when this is the colour selected in the background palette, but for some images the use of a different background colour is preferable.
Hope I've made myself clear!
Jon ;)
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Forum: Post Your Photos!
05-24-2012, 05:30 AM
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I have always found capturing yellow flowers 'in the wild' challenging; highlights often being blown and the hue not resembling that of the actual flower. IMHO, however, the image of this self-seeded poppy growing on a garden path seems a step in the right direction :cool:
 Yellow Poppy by Dr 'B ', on Flickr
Constructive criticism/advice welcomed.
Jon ;)
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Forum: Lens Clubs
05-19-2012, 09:46 AM
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Forum: Pentax SLR Lens Discussion
05-17-2012, 05:03 PM
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19: 10 AF and 9 MF ranging from 19 - 400mm. In my defence (or defense, if your prefer), I share some of these with my teenage daughter.
If pushed, would categorise my LBA status as incipient but stable. Prognosis remains favourable whilst funding deficit persists!
Jon
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Forum: Troubleshooting and Beginner Help
05-17-2012, 04:23 PM
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The Canon version is marketed and sold by Hahnel as being compatible with the K5, K7, K20, K10, K200 and K100 Hahnel Innovative Accessories
I have a pair and can confirm that they are compatible with the K5, K20 and K10.
Although not listed as being compatible, I see no reason why, a priori, they would not function equally well with a Kr.
If that is not reassurance enough, why not check with Hahnel? My e-mail requests for additional information have always been answered within 24h.
Jon :cool:
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Forum: Lens Clubs
05-13-2012, 12:42 PM
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「有り難うございます。」, Kuaan :)
Your images capture the essence of what I now know to be an ancient and deeply spiritual garden; especially the second which left me imbued with a great longing to experience first-hand its' beauty and tranquility.
Jon
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Forum: Lens Clubs
05-06-2012, 06:05 AM
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A real pleasure to use and rapidly becoming one of my favourite lenses. The images produced with it have an appealing 'ethereal' quality that is quite distinct from those I have obtained using its close relative the M 50mm f/1.7.
 Soft focus I by Dr 'B ', on Flickr
 Soft focus II by Dr 'B ', on Flickr
 Soft focus III by Dr 'B ', on Flickr
Jon ;)
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Forum: Lens Clubs
05-06-2012, 05:38 AM
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Thank you all for your generous comments :cool:
As requested, here are some images and further information:
 Pentax-fit (K) 135mm f/2.8 Super Ozeck II by Dr 'B ', on Flickr
 Pentax-fit (K) 135mm f/2.8 Super Ozeck II by Dr 'B ', on Flickr
 Pentax-fit (K) 135mm f/2.8 Super Ozeck II by Dr 'B ', on Flickr
Construction: all metal with 5, MC optical elements in 4 groups; 52mm fliter thread.
Aperture range: f/2.8 - f/16 in full stops.
Minimum focus: 1m (~ 1:5 on 35mm film)
Other features: retractable built in lens hood.
Mass: 360g (PKA mount) including lens caps
Country and date of manufacture: Japan; 1982 - ?
Distributor: Focus Photo Supplies Ltd.
U.K. price in 1982: £38.00.
AP w/e 28/8/82: "While the specificationsof this lens are standard, in terms of performance it was one of the best 135s we've seen".
"An optic which is an advertisement for the fixed focal length lens. Although a simple design, performanceof this lens was hard to fault. Test prints were extremely crisp - at f8 it would be difficult to find a better result. Contrast also very high. Slightly soft at full aperture and at f/16 -22, but still more than adequate."
"Apart from the exceptional 135mm, they won't match top camera maker's own lenses, but they are not far behind..."
Dr 'B' (Jon) ;)
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Forum: Lens Clubs
05-04-2012, 11:25 AM
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The Super Ozeck lens range were produced in Japan in the early 1980s for the U.K.discount warehouse chain Comet. AP reviewed the entire range and considered the 135mm to be the cream of the crop and to be the equal of its contemporaries produced by the camera makers. This particular example is in near mint condition and was purchased for the princely sum of £16.00 (~$26.00). The lens has a built in hood but it is insufficiently deep, so I created a 'slip-on' extension out of black Fab Foam.
My initial impressions are that this is a sharp lens, however, as I have no other 135mm with which to compare it, I would be interested to hear the opinions of other members with more experience of using lenses of this focal length manufactured by Pentax and the main third-party manufacturers.
 Rainfall on Granny's bonnet (Aquilegia vulgaris) by Dr 'B
', on Flickr
 Anthurium sp by Dr 'B ', on Flickr
 Anthurium sp by Dr 'B ', on Flickr
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Forum: Lens Clubs
05-04-2012, 11:05 AM
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  Bought this week for £40.00 (~$65.00). Described as 'in good condition', but I would have rated it Ex-; there being no marks on the front or rear elements and, suprisingly for such a veteran, no visible interior dust. Aperture opens and closes smoothly whether used in A or M mode and the focussing mechanism is smooth and precise. Externally, there is a little paint wear, consistent with age and use. Unexpectedly, there being no mention in the ad', the lens arrived in the original box and packaging with the manual and warranty documents still sealed in their little plastic bag!
Definitely a lens that needs a good hood, Fortunately, I was able to download a custom template made for the AF Nikkor 20mm f/2.8 which, as luck would have it, has the same (62mm) filter thread, designed for use with sensors having a 1.5 - 1.6X crop factor Digital lens hoods. Rather than use paper, I chose to make mine from black Fab Foam, which is thicker, more durable and water-resistant.
Initial impressions are favourable, with the proviso that shooting wide-open is likely to disappoint. A noticeable improvement in sharpness/contrast is apparent at f/4.5 which is marked by f/5.6. This trend continues through f/8 and peaks, at least for my example, at f/11. The colour balance produced with this lens is, IMHO, very slightly on the warm side of neutral. No exposure problems have been when using the lens in Av-mode with either the K20D or K5. Haven't yet compared its performance with zoom lenses in my possession that cover the same range (DA 16-45 and Sigma 17-70), although it is the clear winner in the size and mass categories!
The image below was captured using a K20D and a mixture daylight and diffused flash (1/180s at f/11 and ISO 400).
 Orchid by Dr 'B ', on Flickr
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Forum: Post Your Photos!
04-13-2012, 07:29 AM
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A veritable gem amongst the many treasures in your portfolio, Snappy: glad I saw it :rolleyes:
Jon:o
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Forum: Pentax K-5 & K-5 II
04-09-2012, 05:59 AM
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IMHO, the second image has better colour rendition/contrast and more fine detail.
Apropos the K5 jpeg vs raw debate, I have found the in-camera processing of images to be a great improvement over that seen in the K10D and K20D. In fact, at ISO settings between 100 and 800 ASA if the exposure/WB are optimal, then there is little to choose between the two formats when images are viewed on screen or printed on A4 or smaller (can't comment on larger sizes as I don't have an A3 printer). When required, however, I have been able to obtain small but definitely worthwhile improvements in tonal range, clarity and sharpness by using the raw file and post-processing in ACR or LR.
Jon ;)
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Forum: Lens Clubs
01-26-2012, 01:00 PM
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There is an extremely detailed, two part comparison of seven 85mm Pentax-fit lenses, including the Samyang which, branding apart, is identical to the Rokinon, here Test_85mm. The fact that it is written in French should not deter any non-French speaker as the many and varied test images speak for themselves. As the author notes in his closing paragraph, the very real and pleasant surprise to emerge from the test is that the Samyang, whilst not perfect, is a very fine lens indeed and represents exceptional value for money.
Hope this helps.
Jon
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