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Forum: Troubleshooting and Beginner Help 1 Day Ago  
Safely remove glue from lens bezel?
Posted By Digitalis
Replies: 10
Views: 356
At first glance that was my conclusion too. One can only wonder what lenses suffered the same fate at the hands of this idiot.
Forum: Photographic Industry and Professionals 1 Day Ago  
What are you shooting as a pro?
Posted By Digitalis
Replies: 10
Views: 646
I am a retiring professional photographer. I'm leaving the industry to pursue a career in classical music....but it seems the industry is having a hard time letting me go.

I still do studio work, I would go mad if I tried to go cold turkey on it. But I'm not working anywhere near the degree that I used to, It has been a welcome change of pace. I occasionally teach at several institutions for advanced photographers*. Over the years I have done a lot of work in assorted genres both in studio and on location: food,fashion,automotive,aviation,glamour,architecture,scientific,forensic - I sold off the rights to the images - which means sadly, I don't really have much to show for my work but by doing that, I get paid more.


The most recent job I did was for a well established Australian jewellery designer which I took the opportunity to combine that with the clothing designs from an up-and-coming Australian designer. Set props were also by an Australian furniture design and manufacturing company. I do what I can to support and promote the best local products.



One of the pleasures of working in the industry is working alongside other professionals in other fields, exchanging ideas, sharing techniques and discussing workflow habits...One of my pet peeves about the industry are inconsistent payers or individuals where I have to chase for money. Also I tend not to get along with people who have pompously bloated Egos, I find them to be a pain to work with.



* One of these institutions has one of the best dark rooms I have ever worked in, I love teaching anything to do with film there...I still have clients that appreciate the qualities of film photography.
Forum: Pentax SLR Lens Discussion 08-29-2019, 04:51 AM  
Why persist in using legacy manual lenses
Posted By Digitalis
Replies: 141
Views: 5,661
^ this guy gets it ^


Pentax K-1 - SMCP-K 50mm f /1.2
Forum: Photographic Industry and Professionals 08-28-2019, 07:27 AM  
Nikon follows Sony in cooking raw files for mirrorless cameras
Posted By Digitalis
Replies: 32
Views: 1,733
Well it is about time they caught up with medium format manufacturers, hasselblad has been cooking their RAW files for years*.


*Specifically any images taken with the Hasselblad HCD 24mm f/4.8 - the lens cannot cover the larger sensors on some digital backs so there can be a considerable loss of image quality when this lens is used with sensors with an active area larger than 32X45mm. One early adopter of this lens noticed his images looked unusually noisy in the corners and images also appeared to be unusually "stretched", and after a little rummaging around with rawdigger they found out that phocus ( Hasselblad's proprietary imaging suite) was altering images by reducing distortion and vignetting without any user input, to make the lens appear to have superior qualities in these aspects than it actually had... I can tell you, when I did my bench test of that lens and posted the results: things got a tad heated on the forums and some Hasselblad acolytes decided to be rather unsporting about it and shoot the messenger. I have never publicly posted detailed lens test results from my optics bench ever since that incident.
Forum: Photographic Industry and Professionals 08-28-2019, 06:42 AM  
DxOmark lens "scoring" versus facts - the good, the bad and the really ugly
Posted By Digitalis
Replies: 30
Views: 1,253
Fundamentally, this statistical qualitative analysis approach is sound. After all, every test group needs a statistical outlier. A data point so far off the plot it causes the analysis team to scratch their heads, and posit the question: "what went wrong there?" Which in the case of DxOmark, is a question in desperate need of a candid response.
Forum: Pentax SLR Lens Discussion 08-27-2019, 06:41 PM  
Considering a 30-35mm prime acquisition
Posted By Digitalis
Replies: 64
Views: 2,206
While money is indeed a factor with any purchase, I can vouch that the FA31 is worth the money.
Forum: Pentax SLR Lens Discussion 08-27-2019, 05:54 PM  
Considering a 30-35mm prime acquisition
Posted By Digitalis
Replies: 64
Views: 2,206
I really don't see much of a dilemma here, the chances are high that Pentax FA31 will deliver exactly what you seek.


Pentax K5IIs - SMCP-FA31mm f/1.8 ASPH Limited [cropped]


Pentax K7 - Pentax SMCP-FA31mm f/1.8 ASPH Limited


Pentax K5IIs - SMCP-FA31mm f/1.8 ASPH Limited
Forum: Photographic Industry and Professionals 08-27-2019, 06:17 AM  
DxOmark lens "scoring" versus facts - the good, the bad and the really ugly
Posted By Digitalis
Replies: 30
Views: 1,253
From my own testing with an optics bench I knew their results were far off the mark. In the early days I was hoping they would amend their rating system and scores - thus far they haven't, furthermore they have ignored calls to do so from people with far more expertise in optics and imaging than they claim to have. In academia it is ill advised to build your plans around a single source of data, use multiple sources if they exist, the truth will emerge from all the background noise.
Forum: Pentax SLR Lens Discussion 08-27-2019, 02:25 AM  
What is your favorite prime?
Posted By Digitalis
Replies: 47
Views: 2,430
For the better part of this year the FA77mm f/1.8 Limited has been my favored lens on the K-1. The Pentax 50mm f/1.2 has also seen frequent use on the K5IIs. Coincidentally, both lenses are roughly equivalent on their respective formats.



Pentax K-1 - SMCP-FA77mm f/1.8 Limited


Pentax K5IIs - Pentax SMCP-K 50mm f/1.2
Forum: Pentax DSLR Discussion 07-28-2019, 07:54 AM  
Left handers are ignored
Posted By Digitalis
Replies: 46
Views: 1,435
For the record, Left handed Flutes do exist.
Forum: Pentax DSLR Discussion 07-27-2019, 07:36 PM  
Left handers are ignored
Posted By Digitalis
Replies: 46
Views: 1,435
Personally I find cameras designed for ambidextrous use to be easier to manage, a lot of older film cameras are like that. As for exclusively left handed cameras? I recall Exakta cameras were made for left handed use - they had a good production run. In this age of boxy cameras I doubt we will ever see anything like the Exakta.



As I recall Jimi Hendrix was a leftie. But instead of bowing to the dominance of right handedness, he strung his guitar backwards - this actually gave him an advantage, as it gave him a unique sound that made him stand out of the crowd.
Forum: General Photography 07-27-2019, 07:27 PM  
How do you set white balance
Posted By Digitalis
Replies: 24
Views: 1,097
My habit is to set my cameras white balance to 5000K and leave it there. Only for really critical work where colour accuracy is paramount, will I change it to suit conditions.
Forum: Pentax SLR Lens Discussion 07-21-2019, 06:46 PM  
Which one is the sharpest of these 3 lenses?
Posted By Digitalis
Replies: 17
Views: 15,447
I'd rank each lens thusly, based on open aperture performance


1] Hexanon AR 50mm f/1.7
2] Pentax K 55mm f/1.8
3] Super-Takumar 50mm f/1.4 - assumign this is the 7 element variant. [optically the 8 element variant is superior]




This title has been taken by the Leica APO-Summicron 50mm f/2 ASPH . This lens carries a hefty price tag even when compared to the faster Summilux. The optical qualities of a fully apochromatic lens design cannot be denied, the apochromatic 50mm makes for an excellent pairing with the Leica APO-Summicron 90mm f/2 ASPH.
Forum: Pentax K-70 07-21-2019, 03:30 AM  
Crack or mark visible through viewfinder
Posted By Digitalis
Replies: 20
Views: 1,018
Thermal shock can cause fractures like this: If the glass isn't annealed properly where it is shaped there can be built up stresses that develop within the glass. These instabilities can be provoked by sudden temperature changes which can result in fractures like this.
Forum: Pentax K-70 07-20-2019, 07:01 PM  
Crack or mark visible through viewfinder
Posted By Digitalis
Replies: 20
Views: 1,018
That looks like a conchoidal fracture. I'm not sure about current glass manufacturing methods these days but in entry level cameras Pentaprisms are seldom made in once piece. Sometimes it is cheaper to make glass with complex geometries in two halves, then cementing them together. This process lessened the amount of waste and time needed to grind a thick glass blank down to the required shape. I suspect this fracture has occurred at the precise point of interface between the two pieces*, there is only one fracture** but it is being reflected by the other, unmarred, half of the prism.

The simplest ( but expensive) way to repair this would be to simply replace the prism entirely, it may be possible to de-cement the halves and fill the space made my the fracture with optical cement and rejoin the halves - which would be time consuming process, but perhaps a more cost effective way of affecting repairs.

* this is confirmed by the central alignment of the fracture.
**as of how it happened is difficult to explain, however these sorts of fracture invariably involve glass striking something with equal or greater hardness than itself. I have seen these kind of fractures in pentaprisms before, but they are quite rare.
Forum: Pentax SLR Lens Discussion 06-28-2019, 11:19 PM  
Lenses between F1.2 to F2.0
Posted By Digitalis
Replies: 69
Views: 2,622
Caveat Emptor*.



Pentax embraces the idea that even large SLR cameras should represent the ideal of take anywhere convenience. Lenses with apertures of f/1.4 and faster are heavy and big, even on mirrorless and RF systems, and doubly so on SLRs. Faster lenses are difficult to design and do design no-compromise fast lenses such as the Carl Zeiss Otus 55mm f/1.4 can be outrageously expensive to manufacture. There is little point in producing something so expensive that hardly anyone is going to buy.


Pentax photographers for years have enjoyed the small and compact FA limited lenses that just happen to balance well and provide generally excellent image quality. Large fast lenses are also somewhat of a specialty. Despite owning some very fast rangefinder lenses, I frequently use lenses of f/2 and slower during daylight hours because there isn't much point in using anything faster than that in broad daylight.



Having done a fairly recent comparitive shoot out with the Leica-S Summicron 100mm f/2 ASPH Vs a 5th gen Hasselblad 110mm f/2 Planar FE. The problems with medium format fast glass are multiplied by the increased resolution of medium format sensors, the hasselblad lens suffers from a lot of problems which are made very apparent by the considerably more expensive and optically superior Leica lens.




Perhaps you should open your eyes to more sites where photos are hosted, and you will see that fast glass isn't always the top dog.


* come on, you guys had to see that comment coming.
Forum: Pentax DSLR Discussion 06-24-2019, 07:02 AM  
How do you know before you buy?
Posted By Digitalis
Replies: 49
Views: 2,497
Well played.:D



To use Wheatfield's example: I have been on many, many test drives and have yet to make a purchase. I figure living in sin is more fun that being a prude.
Forum: Photographic Industry and Professionals 06-24-2019, 06:47 AM  
Is this a message from Canon?
Posted By Digitalis
Replies: 22
Views: 1,828
Quite right, and the shorter the registration distance optical alignment is going to be even more of a headache. With SLR lenses here is be a degree of slop with optical alignment, you can't get away with that when the entire optical assembly is so close to the sensor, where perfectly centered delivery of each ray is critical. Also AR coating technologies are going to have to improve vastly to counter the problematic issue of flare that are common with short registration distances.




There was a point where Canon Made RF lenses. As I recall, the Canon 50mm f/0.95 was in production before the famed Leica 50mm f/1.2 Noctilux ASPH
Forum: Photographic Industry and Professionals 06-19-2019, 04:45 AM  
Is this a message from Canon?
Posted By Digitalis
Replies: 22
Views: 1,828
Canon are beginning the slow process of burning their bridges with EOS. Expect expect EOS to be slowly starved of new optics and eventially phased out completely.




Short back focus lenses have been used in cine lenses for a considerable amount of time. The size and weight savings of short back focus lenses have been a consideration for cinematography as it often involves quite a bit of travel and the heavier the gear is, the more expensive it is to ship around the world.




Yes, I saw that: and I'm calling BS. While astigmatism and coma are more problematic with long back focus lenses, the psf is fundamentally the same whether the lens has a short back focus or a long one.
Forum: Pentax DSLR Discussion 06-17-2019, 07:09 PM  
How do you know before you buy?
Posted By Digitalis
Replies: 49
Views: 2,497
Yes, this is a conundrum. I think you should make the acquaintance of some professional photographers in your city who work with the gear you are interested in. Since it's isn't possible for you to "try" a $10,000 camera, let alone purchase one only to find several crucial features simply don't gel with your workflow...and having to sell it as used and take a financial loss in the process.
Forum: Pentax DSLR Discussion 06-17-2019, 03:16 AM  
How do you know before you buy?
Posted By Digitalis
Replies: 49
Views: 2,497
Fair point, there are certain reviewers who I have observed to have rather fair and balanced views on cameras - if you have been in the industry long enough you learn which voices to listen to and which you can safely relegate to the trashcan.



I have a lot of colleagues who like me, work with different camera systems. If they don't have the gear with them I'll ask for their impressions. If they have the time, I'll ask them to show me what they are working with and how it works for them. I get a lot of requests for this from colleagues regarding some of the higher end cameras I work with, since starting with a new camera system can represent a considerable investment many of my colleagues want to be sure it will suit their needs.

You can spend literally hours pouring over reviews and spec sheets but at the end of the day: There is no substitute for holding the camera in your hand and using it.

I used to pour over reviews and spec sheets. Used to do ridiculous amounts of tests of AF & AE systems and sensor characteristics to see if my gear was up to my standards and and delivered performance that is worth the Money spent. You know what the first thing I do these days when I bring a new camera box home with me? I toss out the manual. If I can't access the basic photographic parameters intuitively the camera UI is fundamentally flawed and is going to cause nothing but distraction.
Forum: Pentax SLR Lens Discussion 04-03-2019, 01:09 PM  
Another recent tour of Sigma factory at Aizu
Posted By Digitalis
Replies: 15
Views: 948
2% of those will be for K mount.
Forum: General Photography 04-03-2019, 01:08 PM  
An observation about DPRís timeliness of reviews
Posted By Digitalis
Replies: 4
Views: 955
Or mirrorless. They seem to have a thing for that.
Forum: Pentax K-3 03-29-2019, 07:12 PM  
Shutter Count Maximum
Posted By Digitalis
Replies: 23
Views: 1,957
Entropy is a big enough problem as things are, I doubt engineers are purposefully holding the door open for it.
Forum: Pentax K-3 03-28-2019, 04:03 AM  
Shutter Count Maximum
Posted By Digitalis
Replies: 23
Views: 1,957
I will also mention over 10 years of working commercially as a photographer, I have had mirror box components fail, but only rarely have had a shutter fail on me.
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