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Forum: Sold Items 01-08-2017, 11:29 AM  
For Sale - Sold: HD Pentax DA 20-40mm f/2.8-4 ED Limited DC WR Lens Black
Posted By JeffB
Replies: 0
Views: 913
PentaxForums.com Marketplace Listing

Item for Sale
HD Pentax DA 20-40mm f/2.8-4 ED Limited DC WR Lens Black

Asking Price
550.00 USD

Item Location
Denver, CO (United States)

Item Description
Condition 9+ Shows little or no signs of wear

Clean barrel. Glass is exceptional. Fully tested. Includes caps, case, hood, box.

Are you the original owner of the item being sold?
Yes

Are you selling or trading this item?
Selling

Item Condition (Key)
Used
Excellent

Shipping Destinations
United States

Shipping Charge
FREE

Shipping Services
UPS, FedEx, USPS

Accepted Payment Types
PayPal

Return Policy & Additional Details
No returns accepted.

Please send me a private message if interested in the item!
Forum: Sold Items 01-01-2017, 05:58 PM  
For Sale - Sold: Tamron 70-200mm f/2.8 DI LD (IF) Macro AF Lens for Pentax
Posted By JeffB
Replies: 3
Views: 1,940
Price reduction bump
Forum: Sold Items 01-01-2017, 05:57 PM  
For Sale - Sold: smc Pentax-D FA 100mm f/2.8 WR Macro Lens in box
Posted By JeffB
Replies: 2
Views: 1,168
Price reduction bump
Forum: Sold Items 12-28-2016, 12:38 PM  
For Sale - Sold: smc Pentax-D FA 100mm f/2.8 WR Macro Lens in box
Posted By JeffB
Replies: 2
Views: 1,168
PentaxForums.com Marketplace Listing

Item for Sale
smc Pentax-D FA 100mm f/2.8 WR Macro Lens in box

Asking Price
380.00 USD

Item Location
Denver, CO (United States)

Item Description
Includes box, caps, hood, case.

Excellent condition (9.5/10)

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

Are you selling or trading this item?
Selling

Item Condition (Key)
Used
Excellent

Shipping Destinations
United States

Shipping Charge
FREE

Shipping Services
UPS, FedEx, USPS

Accepted Payment Types
PayPal

Return Policy & Additional Details
No returns.

Please send me a private message if interested in the item!
Forum: Photographic Industry and Professionals 12-27-2016, 03:58 PM  
What to do when your photograph got stolen ?
Posted By JeffB
Replies: 23
Views: 2,697
Excellent news. I totally agree, even if you are not able to extract damages, just making them deal with the legal system will cost them time. And time is money.
Forum: Pentax SLR Lens Discussion 12-23-2016, 11:04 AM  
New Pentax Lenses in 2017: Really?!
Posted By JeffB
Replies: 101
Views: 9,727
Most of those vague descriptors on that roadmap strongly resemble the other new Tamron SP lenses.


Wide-angle single focus <==?==> TAMRON SP 35mm F/1.8 Di VC USD
Large aperture standard <==?==> TAMRON SP 45mm F/1.8 Di VC USD
Large aperture medium telephoto <==?==> TAMRON SP 85mm F/1.8 Di VC USD
Forum: Pentax DSLR Discussion 12-23-2016, 10:49 AM  
Teleconverter and "Input Focal Length"
Posted By JeffB
Replies: 11
Views: 1,207
Most teleconverters have limited functionality when used with lenses slower then f/2.8. So using that lens at f/5.6 could be causing some trouble. Beyond that, it is likely just a limitation of the off-brand TC. Do you have any documentation on the TC? Is it supposed to transmit "altered" lens data or is it just a pass through allowing the unaltered lens data to get to the camera? I do not have a current Pentax branded TC but I'd be curious to know if those register TC * lens focal length in the EXIF or just the lens focal length.
Forum: Flashes, Lighting, and Studio 12-23-2016, 10:31 AM  
best manual, radio trigger speed light system?
Posted By JeffB
Replies: 130
Views: 11,192
I found the Pocketwizards well worth the initial investment. Triggering with the Sekonic meters saves time and trouble.
Forum: Pentax DSLR Discussion 12-23-2016, 10:12 AM  
Teleconverter and "Input Focal Length"
Posted By JeffB
Replies: 11
Views: 1,207
What lens are you using? What does your EXIF data show for shots using the TC + lens? My understanding was that the prompt for "input focal length" appeared when the camera could not detect the lens data. So if you are not seeing that prompt the lens data must be getting to the camera.
Forum: Digital Processing, Software, and Printing 12-22-2016, 06:24 PM  
Is Photoshop CC worth it if I only want the funtionality of Camera Raw?
Posted By JeffB
Replies: 26
Views: 1,868
The monthly subscription for Adobe CC is well worth it to me. Consider the cost of full version purchases or upgrades every year or two versus the subscription. CC is constantly up to date. Full raw workflow. Lightroom may provide you with everything you want.
Forum: Pentax K-1 12-22-2016, 06:06 PM  
Full Frame Ironies
Posted By JeffB
Replies: 34
Views: 3,916
Full frame advantages (* * * to me * * *)
  1. Shallow DOF at a given working distance from the subject. DOF of 100mm lens at f/2.8 is the same regardless of whether used on 16x24mm or 24x36mm sensor at the same distance. But to achieve the same field of view with the same lens you can be closer with a larger sensor and therefore DOF is reduced. Good for portraits.

  2. Greater field of view at 1:1 for macro. To achieve 1:1 magnification you must be a fixed distance from the subject at a given focal length. Using a larger sensor puts more of the subject into the frame at 1:1 versus a smaller sensor using the same lens.

  3. Better dynamic range and less noise is possible. The pixel pitch on larger sensors is generally larger than smaller sensors. Larger photosensors tend to have less noise. This advantage gets cancelled out as most full frame sensors have higher pixel count than APS.

  4. More efficient use of the body size and existing lenses of the entire SLR platform. Most SLR bodies and lenses are based on a 24x36mm frame size. That includes DA lenses that only project an APS image circle. The mount size of a DA lens is still the same as that of an FA type lens. APS sensor bodies are still nearly as large as full frame bodies. Pentax seems to me to do the best job here with their APS bodies compared to other brands. K-1 @ 1000g versus K-3 @ 800g. So the K-3 is 20% lighter. But the K-3 sensor is 67% the size. If it was truly proportional the body would only weigh 667g. Fuji has an edge here because they designed their platform around the smaller sensor. Canon and Nikon (and possibly now Pentax) are committing more and more to the "full frame" game because their existing platforms were all based on that frame size for the last 50+ years.


Full frame disadvantages (* * * to me * * *)
  1. Shallow DOF. What was an advantage in some situations can be a detriment in others like landscapes where you want super deep DOF. Shooting from the same distance at the same aperture and capturing the same field of view with full frame versus APS you'll have greater DOF on APS because you'll be using a shorter focal length.

  2. Shows edge weakness in many lenses. "Cropping" the image circle by using an APS sensor often gives you the best quality image because most lenses are weaker (lower res, more distorted, more CA) near the edges. If you use full frame you have to invest heavily in the best glass possible to get full value from each shot. If you end up cropping the outer 1/3 of most frames because of poor lens performance you should have just shot the images on APS to start with and "pre-cropped" the bad parts of the frame out.

  3. Storage. Bigger sensors with more pixels have bigger file sizes that take up more disc space and are slower to ingest, process, print and archive.

Forum: Troubleshooting and Beginner Help 12-22-2016, 04:34 PM  
Do any of you shoot on a tripod with SR on?
Posted By JeffB
Replies: 71
Views: 4,550
Pentax K-5II (page 123): "Caution Set [Shake Reduction] to (Off) when using the camera with a tripod or when this function is not needed."

Pentax K-7 (page 132): "...it is recommended that the Shake Reduction function be turned off and the camera be used with a tripod."

Nikon AF-S NIKKOR 70-200mm f/2.8G ED VR II (page 21): "When the camera is mounted on a tripod, set the vibration reduction ON/OFF switch to OFF"

Sigma 50-500mm f/4.5-6.3 APO OS DG HSM: "Please do not use Optical Stabilizer in the following situations. When the lens is mounted on a tripod. Bulb (long time exposure)."
Forum: Troubleshooting and Beginner Help 12-22-2016, 02:04 PM  
Do any of you shoot on a tripod with SR on?
Posted By JeffB
Replies: 71
Views: 4,550
You must turn off in-body SR stabilization when the camera is mounted to a tripod. This is clearly stated in every user manual of every camera. The reason is simple: you are creating a feedback loop. When the camera is fixed in position the movement of the SR system itself introduces movement that is detected and compensated for and detected and compensated for . . . . and on and on. That is why Pentax did such a great thing by automatically disabling SR when using the 2 second timer. A feature I use constantly.
Forum: Photographic Industry and Professionals 12-22-2016, 01:51 PM  
What to do when your photograph got stolen ?
Posted By JeffB
Replies: 23
Views: 2,697
I am not sure that MadMathMind's statement regarding the purchaser of the stolen content is accurate.



At the very least their ownership or right to use said stolen content would be void. That I am sure of. Legal consultation would be needed to see if further damages could be collected from them. Just the threat of going after the "deep pockets" of the business that may have inadvertently purchased the stolen IP could be enough to push them to in turn go after the real perpetrator. That is what I call leverage.

I'd suggest reading through the DOJ guidelines too. https://www.justice.gov/criminal-ccips/file/891011/download
Forum: Pentax DSLR Discussion 12-16-2016, 10:02 PM  
Will Ricoh continue with APS
Posted By JeffB
Replies: 179
Views: 12,199
It would make no sense for Pentax to abandon APS. That's the entry point for the vast majority of users. If they went to only full frame bodies Pentax would become even more of a niche brand than it already is and I doubt that would be a healthy long term strategy.
Forum: Pentax Camera and Field Accessories 12-16-2016, 07:50 PM  
Gitzo First Impressions
Posted By JeffB
Replies: 17
Views: 1,555
Benro.
Forum: Flashes, Lighting, and Studio 12-16-2016, 07:03 PM  
Lighting Kit - and indoor setup
Posted By JeffB
Replies: 20
Views: 2,195
Are you looking strictly at hot lights rather than strobes? For portability I'd seriously consider a simple strobe setup + a flash meter.

I'd say a 2 light setup is adequate unless you want to achieve more background and/or hair separation with your subjects.

Basically you'll need:

5-6ft light stands
universal clamps
hotshoe clamp adapters
master flash (if your camera doesn't already have one built in)
slave strobes (you don't need dedicated TTL)
unbrellas
triggers (if the slaves you get don't already have some kind of trigger system)
power (whole bunch of AA rechargeables -or- dedicated external battery packs if the strobes support them)

Call B&H and explain what you want to end up with: "Portable 2-3 strobe off camera setup" and they can get you everything you need and make sure you don't forget any little parts.

Power supply really depends on how many frames you need to shoot per session. Just one set of AA's could get you through at least 100 frames at full power on most strobes.
Forum: Flashes, Lighting, and Studio 12-16-2016, 07:03 PM  
Lighting Kit - and indoor setup
Posted By JeffB
Replies: 20
Views: 2,195
Are you looking strictly at hot lights rather than strobes? For portability I'd seriously consider a simple strobe setup + a flash meter.

I'd say a 2 light setup is adequate unless you want to achieve more background and/or hair separation with your subjects.

Basically you'll need:

5-6ft light stands
universal clamps
hotshoe clamp adapters
master flash (if your camera doesn't already have one built in)
slave strobes (you don't need dedicated TTL)
unbrellas
triggers (if the slaves you get don't already have some kind of trigger system)
power (whole bunch of AA rechargeables -or- dedicated external battery packs if the strobes support them)

Call B&H and explain what you want to end up with: "Portable 2-3 strobe off camera setup" and they can get you everything you need and make sure you don't forget any little parts.

Power supply really depends on how many frames you need to shoot per session. Just one set of AA's could get you through at least 100 frames at full power on most strobes.
Forum: Pentax Camera and Field Accessories 12-16-2016, 05:58 PM  
Gitzo First Impressions
Posted By JeffB
Replies: 17
Views: 1,555
I'll have to make a camera to firearms analogy here that may enrage some people for different reasons. But bare with me...

Gitzo tripods remind of really expensive M1911 45 auto pistols. They are made to ridiculously tight tolerances and perform flawlessly when maintained in perfect condition. But one little piece of sand can bring the whole thing to a grinding (literally) halt. I have had this experience with both a Gitzo and a 1911. I prefer a slightly sloppier fit that allows for some grit and grime in the mechanisms without causing a total seizure.
Forum: Pentax SLR Lens Discussion 12-16-2016, 05:45 PM  
Pentax - Thoughts on making a DA*/DFA 400mm F4?
Posted By JeffB
Replies: 59
Views: 5,520
I totally agree that a 400 f5.6 is far more realistic in the current market. My gut feeling is that a DFA 300 f2.8 is a more likely addition to the lens lineup. That is a much more common standard "pro" lens that Pentax really needs if they intend to compete for pro sports market share against Canon and Nikon. They would likely make and sell many more 300's and economies of scale would make the cost to us much more attainable compared with the likely $ of a 400 f4.

A 300 f2.8 + 1.4X TC => 420mm f/4 and would give you almost exactly what you want. I'd buy that combo but not the standalone 400 f4.
Forum: Sold Items 12-16-2016, 02:12 PM  
For Sale - Sold: Tamron 70-200mm f/2.8 DI LD (IF) Macro AF Lens for Pentax
Posted By JeffB
Replies: 3
Views: 1,940
PentaxForums.com Marketplace Listing

Item for Sale
Tamron 70-200mm f/2.8 DI LD (IF) Macro AF Lens for Pentax

Asking Price
600.00 USD

Item Location
Denver, CO (United States)

Item Description
Tamron 70-200mm f/2.8 DI LD (IF) Macro, Fast AF Telephoto Zoom Lens for Pentax Autofocus

Includes all original packaging and accessories: case, box, caps, hood.

Completely clean.

Are you the original owner of the item being sold?
Yes

Are you selling or trading this item?
Selling

Item Condition (Key)
Used
Like New

Shipping Destinations
United States

Shipping Charge
FREE

Shipping Services
UPS, FedEx, USPS

Accepted Payment Types
PayPal

Return Policy & Additional Details
No returns accepted.

Please send me a private message if interested in the item!
Forum: Pentax SLR Lens Discussion 12-12-2016, 08:29 PM  
Poll: Tamron 70-200 2.8 owners...how soft is 'too soft'?
Posted By JeffB
Replies: 19
Views: 3,555
It really is not practical for us to judge "softness" of a particular lens based on the photos you posted. There are too many variables not accounted for: exposure, tripod, AF/MF, AF point, SR?

Basic guidelines for testing:
https://www.lensrentals.com/blog/2010/11/how-to-test-a-lens/
How to Test Your Lens | B&H Explora

Source for downloadable* test chart:
ISO 12233 Test Chart

*Note that by downloading and printing your own chart versus buying one you are adding the variables of your printer into the mix.

If you really want to make sure you are testing your lens and not your handholding technique or your tripod stability, try putting the camera+lens on a sandbag or similar to completely eliminate movement. Be sure in-camera SR is OFF.
Forum: Troubleshooting and Beginner Help 12-12-2016, 08:16 PM  
Converters from Nikon or Canon to Pentax mount
Posted By JeffB
Replies: 15
Views: 1,381
I know price is not always an indicator of quality. But I've never seen any "high-end" adapters to Pentax K mount. My basis for pricing is simply the going rate for know good quality teleconverters ~$100-$400+. I've only ever seen ~$30-40 Nikon lens to Pentax body converters. So my feeling is the glass quality of the elements is pretty low.

If you are into cross platform lens experimentation without any alteration of image quality you need lenses with a longer registration distance than the camera. So medium format lenses can be plugged into most APS or 35mm sensor DSLRs by simple tube adapters having no glass. You just crop the image circle.

Canon is the only DSLR platform where you can (sort of) easily adapt other SLR lenses without intervening elements because Canon's sensor to mount registration distance is the shortest of any maker.

MIrrorless offers lots of possible adaptations of 35mm lenses because all mirrorless bodies have a much shorter registration than the DSLR bodies.
Forum: Photographic Industry and Professionals 12-11-2016, 04:39 PM  
What to do when your photograph got stolen ?
Posted By JeffB
Replies: 23
Views: 2,697
Step #1 is to capture evidence of the violation. I hope you saved screen grabs of your image being misused.

Next decision is whether you want any type of future business relationship with the party that misappropriated the image. If you do, take the opportunity to reach out (as you sort of did) and offer them the opportunity to properly license your image for a fee.

If they refuse option #1, or you have no interest in potential future work from the violator, go on full offense. Have a legal rep send a cease and desist letter to all parties involved.
Forum: Pentax DSLR Discussion 12-11-2016, 04:31 PM  
Time for Pentax to become modern and costumer friendly!
Posted By JeffB
Replies: 17
Views: 2,250
Tethering is S.O.P. for many studio workflows. Stylist and client can watch real time capture during the shoot and make adjustments as needed. It is also used in high volume shoots so edits and post processing can begin on-site.
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