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Forum: Site Suggestions and Help 03-27-2010, 04:38 PM  
pop up , whats' up?
Posted By kevindt
Replies: 12
Views: 840
I haven't been posting for a few months due to a host of other commitments, but I have logged on periodically as a reader and still donate. Somehow this time my auto-logon did not work either and until I tried to see who else hated these popups did not realize that I was on as a guest!

A general e-mail message to the members (like the e-mails I get for other new features) to inform them these only occur if not logged on might help avoid a lot of ruffled feathers - we don't look at the homepage welcome message for guests.
Forum: Pentax Camera and Field Accessories 08-30-2009, 09:27 AM  
custom rain cover/hide made with brolly & tripod?
Posted By kevindt
Replies: 4
Views: 2,692
You might also look at these guys for some ideas. Lots of variations and pretty inexpensive.

Discount hunting supplies for deer hunting, duck hunting, turkey hunting, and all types of hunting
Forum: Weekly Photo Challenges 08-25-2009, 10:53 PM  
Picture of the Week #76 - 08/16/2009 - 08/30/2009 - Everyone Join In
Posted By kevindt
Replies: 67
Views: 12,834
Thanks, photolady for looking into the bird ID. I looked them up afterwards (we only have the White-faced ibis here on the Western side) to see more once I saw your post.

Very nice pictures all.

I love that first landscape, Jeff.

Here are a few more from my back yard from today. Goldfinches attacking the thistle seed sock:








I've sat for ages trying to catch the darned humming birds. Predictably, when set up in MF to shoot the finches, this one appears - no time for accurate focusing, no flash attached - then he's off again :)


Forum: Sold Items 08-25-2009, 09:08 PM  
For Sale - Sold: Sigma 150-500mm F5-6.3 APO DG HSM lens
Posted By kevindt
Replies: 4
Views: 4,173
Item was held for the buyer at his request - payment now received and dispatch pending.
Forum: Weekly Photo Challenges 08-23-2009, 08:49 PM  
Picture of the Week #76 - 08/16/2009 - 08/30/2009 - Everyone Join In
Posted By kevindt
Replies: 67
Views: 12,834
Thanks for hosting again, Dave.

It seems to be a week for birds so far!

Dave, your blue jays up there are prettier than our version (Western scrub jay) that are down below (frightening off the hummers I was still trying to catch). Nice hip cat(fish)!

Tpeace (Tom) - you succeeded with the hummers!

Scott - you've found a nice blue heron there!

Maxwell1295 - beautiful shot of a beautiful couple!

Photolady - not sure which birds you have there!

xs400 - like #1 particularly!

One of the three Western scrub jays who "own" my back yard and cuss at me when I walk out there:)





Forum: Weekly Photo Challenges 08-09-2009, 10:56 AM  
Picture of the Week - 08/02/2009 - 08/16/2009: Everybody join in!
Posted By kevindt
Replies: 64
Views: 12,742
Thanks for hosting, Rense. Nice pictures with the Tak, too. That food looks good!

Andras - nice to see you back. Nice cold wine there, too.

Dave - those are interesting pelicans, didn't know they were up that far!

Eccs19 - nice timing :p

I've been wandering round the local creek for a couple of years since I last saw a green heron without seeing them, and suddenly last time there were two!







Forum: Weekly Photo Challenges 08-08-2009, 10:30 PM  
Welcome to Picture of the Week 08/2/09 - 08/9/09 #72
Posted By kevindt
Replies: 78
Views: 8,946
Light Horseman - I like that 1st long exposure particularly.

Frank and Dave - both good full moon pictures!

Jan - that library looks like a very interesting piece of architecture, allowing natural light to pass right through to the area beneath.

Rense - I only hope that is a trick of juxtaposition; that bird looks way too healthy!

xjjohnno - nice first pics with the Bigma. You have such gorgeous wild birds to aim it at, too.

Steve - that looks like an interesting fort, even if a reproduction.

Here are just a few from early sunrise, with orange glow lighting everything, and soon after. All with the Sigma 150-500 HSM.

Acorn Woodpecker




Acorn woodpecker adult (below) and juvenile (above)


Forum: Sold Items 08-08-2009, 05:25 PM  
For Sale - Sold: Pentax DA* 300mm
Posted By kevindt
Replies: 15
Views: 3,311
Your pictures are beautiful!
I have the same lens and it is probably the last lens I would ever sell unless starving and homeless :).
If you are a nature/bird photographer this lens is hard to beat, and it works wonderfully with the Tamron 1.4x Pz-AF or the Kenko 1.5x converters with minimal loss in IQ, as you show so well here.
Best of luck with the sale!
Forum: Sold Items 08-06-2009, 03:53 PM  
For Sale - Sold: Sigma 150-500mm F5-6.3 APO DG HSM lens
Posted By kevindt
Replies: 4
Views: 4,173
PentaxForums.com Marketplace Listing

Item for Sale
Sigma 150-500mm F5-6.3 APO DG HSM lens

Asking Price
$850 (firm)

Item Description
I have my "Big Sigma" for sale. It is a very nice lens to use, but I really do not use it enough to keep. It is a very good wildlife lens. Its weight and balance make it surprisingly stable handheld, using the K20d's SR.

Overall, it is in excellent condition with all paperwork and the original lens hood, box, soft case, and a UV filter is included. Lenses are clean, obviously free from fungus,etc. It has a slight wear spot on the tripod ring (shown in the photograph) but otherwise the finish is very clean. It does not need any correction to autofocus on my K20D.

This model has the HSM contacts and HSM works well with the K20D, unlike the Bigma.













A few photographs from this lens:

at 370mm (handheld)




at 500mm (car window clamp)


at 500 mm (handheld)


Are you the original owner of the item being sold?
No

Are you selling or trading this item?
Selling

Item Condition
Used
Excellent

Item Location
Chico, CA

Shipping Charge
Inclusive (USA mainland only).

Shipping Services
USPS Priority

Shipping Destinations
United States

Accepted Payment Types
PayPal Check/Money Order

Additional Details
B&H are currently selling new at $999.
With the size and value of this item, I am not shipping outside the USA.
Personal checks need to clear through the bank before dispatch.

Please send me a private message if interested in the item!
Forum: Weekly Photo Challenges 08-04-2009, 11:29 PM  
Welcome to Picture of the Week 08/2/09 - 08/9/09 #72
Posted By kevindt
Replies: 78
Views: 8,946
That looks like a fun festival, Dave. The Ukrainian costumes in particular are very photogenic!

Here are a few bird pictures (most of my birding is in winter, but can't resist a few if I can catch them).

Male California Quail


And his mate


And a Lesser Goldfinch eating the Star thistles


Forum: Weekly Photo Challenges 08-04-2009, 03:24 PM  
Welcome to Picture of the Week 08/2/09 - 08/9/09 #72
Posted By kevindt
Replies: 78
Views: 8,946
Thanks for hosting this week, AOski.

Still very hot here, so a few macros from the back yard. (All with the Kiron/Vivitar 105/2.5 on K20D)



Crop from #1







Forum: Weekly Photo Challenges 08-04-2009, 12:38 PM  
Weekly Challenge Weekly Challenge #105 Backlighting
Posted By kevindt
Replies: 30
Views: 3,702
Young deer, soon after sunrise.
K20D/DA*300 at 1/500 f4.5

Forum: Weekly Photo Challenges 07-26-2009, 08:29 PM  
Welcome to Picture of the Week 07/19/09 - 08/02/09 #72
Posted By kevindt
Replies: 83
Views: 10,943
One more from last Sunday

Forum: Weekly Photo Challenges 07-26-2009, 07:53 PM  
Welcome to Picture of the Week 07/19/09 - 08/02/09 #72
Posted By kevindt
Replies: 83
Views: 10,943
Thanks for hosting again, Dave. Looks like the trip to Vegas is over (this one, anyway) and back to local pics now for a while :D

Georg - those tall ships are beautiful!

Reeftool - Agreed, those are green herons. I have not seen any locally (West coast) this year and only caught one on film last year. Envious :p

Rense - those are nice spiders. The bellows is doing a really nice job there.

Scott - more good soccer shots, and yes, it's the goalie for my favorite too.

Tom - your herons are much more reliable than those over here - and like being pictured :lol:

Captmacq - the trains are nice - and so is the little green heron there too!

Still plenty hot here (well over 100F and worsening) so a few quick ones from down by the river.





Forum: Weekly Photo Challenges 07-21-2009, 07:22 PM  
Weekly Challenge Weekly Challenge #104 Flowers B&W
Posted By kevindt
Replies: 53
Views: 8,166
Like many others, I normally do flowers for their colors, but here is one in B/W just for you :lol:

Forum: Weekly Photo Challenges 07-19-2009, 11:36 PM  
Welcome to Picture of the Week 7/12/09 - 7/26/09 #71
Posted By kevindt
Replies: 64
Views: 15,178
Thanks for hosting this week, seacapt, and nice insect macros to start it off

It's still way hot around here - 104F again today and expected to stay the same - so more swimming than picturing going on round here.

Here are a few macros from the last week.









Forum: Pentax Lens Articles 07-08-2009, 10:07 PM  
Beware cheap "circular" polaizers
Posted By kevindt
Replies: 16
Views: 53,439
A good polarizing filter is probably the single most useful filter for color photgraphy, and is still useful in black and white work. If used properly, it can reduce reflections from shiny surfaces, heighten sky contrast, improve foliage contrast by removing flare and double as a 2x ND filter for some situations (and two stacked linear polarizers can also make an infinitely variable ND filter).

Polarizers come mostly in two types - linear and circular polarizers.

Most normal light has a mixture of polarizations that is mostly pretty random.

Linear polarizers selectively remove that part of the light that is not polarized in the same plane as the filter. What remains and passes through to the camera lens is mostly polarized in the same plane as the filter is oriented. (that is very similar to an red filter for B/W that removes mostly green light, passing primarily red light on to the lens).

Circular polarizers are really two filters stacked one behind the other. The filter furthest from the lens is a regular linear polarizer. Immediately behind that (in the same mount) is a "quarter wave plate" oriented at 45 degrees from the polarizer. That converts the "linear polarized" light coming back from the front polarizer to "circularly polarized" light that contains all polarizations again. Just how it does it is complicated, but I can post a more in-depth article if interested.

Reflected light is partially polarized in the process of being reflected, whether it is from an object in the image that you are trying to photograph, or reflected from the beam-splitting mirror in your DSLR that allows autofocus/metering. That means, in theory at least, that feeding the camera with linearly polarized light might interfere with light metering and/or autofocus, while feeding it with circular polarized light should not. Because of this, the normal dogma is that you need a circular polarizer on a DSLR to allow autofocus and metering to work properly. In actuality here, I have found little or no problem with linear polarizers (which are often better, cheaper and less prone to other artifacts including color casts). That has been true with istD, istDS, K100D and my current K20D.

The simplest test for whether a polarizing filter is really and truly a circular polarizer is very easy. Look through it into a mirror. This is a Hoya PL-CR filter that is first held in the normal orientation (male threads toward the camera lens or my eye). Light is reflected off the mirror and passes back through. There is some darkening (about 1-2 stops with each pass through the filter) but the camera is clearly visible in the reflection. There is very little color cast visible.



Now reverse the filter. This is the same Hoya PL-CR filter with the male threads pointed to the mirror, away from the camera. Now the mirror image of the filter is very dark, making it harder to read the logo and much harder to read the lens lettering..



(Just why that happens is fairly complicated. Again, if there is interest I can post a more in-depth explanation).

If you try the same test with a good linear polarizer, there is absolutely no difference on reversing it - the image looks identical, and with minimal color cast.


Now look at a cheap Visico CPL circular polarizer bought off ebay. This is in normal orientation, male threads to camera lens.



And this is the Visico CPL reversed, female thread to the lens.



The first thing that is obvious is the lack of darkening when the filter is reversed, but there is also a definite yellow color cast in both orientations. This "circular polarizer" is only circular in shape, not in type!

This holds true for other filters I have acquired over time, some with lenses, some on their own. The Hoya 67 and 77 mm PL-CR filters are true circular polarizers with minimal color cast. The Hoya 49 and 52 mm PL are true linear polarizers, again with very little color cast. In contrast, each of the cheap Asian filters from Visico or no-name from Korea fail this simple test, both obviously as true circular polarizers and also by introducing unwanted color casts.

Try it with your own filters and see which others pass the test!
Forum: Sold Items 07-06-2009, 10:34 PM  
For Sale - Sold: Pentax Right Angle Finder
Posted By kevindt
Replies: 12
Views: 1,740
That is the case he's talking about :p

I bought one of these recently. Fits the film cameras (Spotmatic, ME etc) perfectly without modification. I had to modify it a bit to fit my K20D but it works absolutely beautifully on it now.
Forum: Weekly Photo Challenges 07-06-2009, 10:22 PM  
Welcome to Picture of the Week 06/28/09 - 07/12/09 #69
Posted By kevindt
Replies: 67
Views: 10,355
I'm kind of busy here so no pictures yet (but working on an article between things)

Quick note of congrats, Jim. Nice ultrasounds of 8-9 week gestation. Hope all works out well over the next 7 months!
Forum: Weekly Photo Challenges 07-05-2009, 04:00 PM  
Picture of The Week : 06/21/09-07/04/09 #68
Posted By kevindt
Replies: 82
Views: 11,476
No, but I used a circular polarizer. By the way, two linear polarizers (or one linear/one circular) stacked give an infinitely variable ND with polarization possibility as well. Two circulars with same direction do not work unless one is reversed.

I have used that before, but did not have them with me.:D)
Forum: Weekly Photo Challenges 07-04-2009, 09:54 PM  
Picture of The Week : 06/21/09-07/04/09 #68
Posted By kevindt
Replies: 82
Views: 11,476
No Fourth of July pics, but here are a few from the park yesterday.







Forum: Mini-Challenges, Games, and Photo Stories 07-03-2009, 10:17 PM  
Let's tell a story
Posted By kevindt
Replies: 188
Views: 21,665
... borrow a bicycle (and spare tire just in case) and find some alternative location to sleep



in preparation for a long day tomorrow chasing ...
Forum: Weekly Photo Challenges 07-03-2009, 08:29 PM  
Picture of The Week : 06/21/09-07/04/09 #68
Posted By kevindt
Replies: 82
Views: 11,476
It's plenty hot here (100F+ a lot of the time), plus fairly busy otherwise, so I've not been out much. Nice pictures from everyone!

I did get a few bug macros in the yard and the creek, and a few water shots I'll post separately.









Forum: Weekly Photo Challenges 06-27-2009, 10:20 PM  
Welcome to Picture of the Week 06/14/09 - 06/28/09 #67
Posted By kevindt
Replies: 63
Views: 11,007
Lots of nice pictures again!

It's been a busy week but here are a few from this afternoon.





Forum: General Talk 06-21-2009, 06:39 PM  
Please alow me to introduce...
Posted By kevindt
Replies: 90
Views: 7,514
Congratulations, Gary and family, both established and brand-new - she's beautiful!
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