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Forum: Non-Pentax Cameras: Canon, Nikon, etc. 2 Hours Ago  
Sigma 35mm F/1.2 ART lens for Sony FE Mount
Posted By Fogel70
Replies: 4
Views: 175
It sounds like it is a dedicated mirrorless design, so it might be smaller and lighter than Sigmas present 35/1.4 FE lens. It will be interesting how they will price this f/1.2 lens.
Forum: Pentax SLR Lens Discussion 05-13-2019, 03:11 AM  
How to accurately select focal length DA lens
Posted By Fogel70
Replies: 15
Views: 952
It is something I miss from my K10D. Earlier Pentax DSLR showed focal lengt on rear info screen.

For some reason Pentax removed FL info on K7 and later cameras.
Forum: Pentax SLR Lens Discussion 05-10-2019, 03:56 AM  
AW vs WR
Posted By Fogel70
Replies: 38
Views: 1,454
So you think it would be an advantage for Ricoh to certify their lenses and cameras to get FI IPX1, while the actual sealing they got would be equivalent of IP34-45?
What advantage would such certification give over the current WR or AW?

My smartphone also go IPX certification (IP68), but as smartphone are fully encapsulated, the certification they get actually give you info on what type of sealing it got.
Forum: Pentax SLR Lens Discussion 05-10-2019, 12:24 AM  
AW vs WR
Posted By Fogel70
Replies: 38
Views: 1,454
To get IPX certification the product has to got through a standardized testing to verify that the product can live up to the rating. The IPX rating was initially designed for personal safety protection on machinery and high voltage products, so testing is a very important part of the certification. So Ricoh can't just label the product with IPX rating as they like.
Forum: Pentax SLR Lens Discussion 05-09-2019, 12:19 AM  
AW vs WR
Posted By Fogel70
Replies: 38
Views: 1,454
As far as I know the IPX standard apply to all normal use intended for the product. So on ILC or lens the IPX rating should be valid for conditions when switching lenses.
It is worst case scenario of normal use that set the standard for the highest IPX rating you can set.

For ILCs and lenses the IPX rating will therefore be set so low that any camera can withstand the conditions, sealed or not.
So using IPX standard for ILC and lenses is equivalent of specifying 0-60 MPh on a fast sports car as "less than one minute".
Forum: Pentax SLR Lens Discussion 05-09-2019, 12:05 AM  
AW vs WR
Posted By Fogel70
Replies: 38
Views: 1,454
The difference is that IPX is a standard that they must comply to. With WR and AW they can set whatever conditions they may like as it is their own standard.

AW sealings are probably equivalent of IP45 or better, and WR of IP34 or better, but as they are not fully encapsulated they can not apply this specification on them.
The highest rating they can use is probably the same as Olympus - IPX1, but that is conditions that most cameras or lenses can withstand, sealed or not.
Forum: Pentax SLR Lens Discussion 05-08-2019, 07:59 AM  
AW vs WR
Posted By Fogel70
Replies: 38
Views: 1,454
Olympus actually have stated IPX rating on some of their ILC. But they could only specify it as "better than IPX1", even on a camera like OM-D E-M1X.
IPX1 is the lowest possible rating you can put on a product (except not protected at all). No rating against dust and lowest protection against water.

"IPX1 Dripping water
Dripping water (vertically falling drops) shall have no harmful effect. Test duration: 10 minutes, equivalent to 1 mm rainfall per minute."


With best sealed lenses on Olympus cameras the sealing is much better than that, so it is just not very meaningful to specify the IPX rating on this type of product.
Forum: Pentax SLR Lens Discussion 05-08-2019, 05:27 AM  
AW vs WR
Posted By Fogel70
Replies: 38
Views: 1,454
Then removing the lens from the camera would void the warranty.

If IPX rating is put on cameras and lenses they must withstand the testing as separate products.
You can't put IPX rating on a product with the condition that it is used together with another product. Then you can say that all products have highest possible IPX rating, you just need to put them is a dust/water tight box. ;)
IP Code - Wikipedia
Forum: Pentax SLR Lens Discussion 05-07-2019, 11:53 PM  
AW vs WR
Posted By Fogel70
Replies: 38
Views: 1,454
For obvious reasons camera manufactures can only put IPX ratings on fixed lens cameras.
When dust particles large as golf balls can enter the lens mount, it will not be meaningful to put IPX ratings on ILC and lenses.

Which is also why they cannot cover against water damages.
Forum: Non-Pentax Cameras: Canon, Nikon, etc. 05-07-2019, 10:30 PM  
Panasonic S1R Really Aces Dx0Mark Testing
Posted By Fogel70
Replies: 8
Views: 648
It looks like a nice camera that few will buy.

At least with current pricing. Both cameras and lenses are over priced compared to competition.

Their 70-200/4 is priced like other brands 70-200/2.8.
Forum: Pentax SLR Lens Discussion 05-06-2019, 09:32 PM  
I am done with m42
Posted By Fogel70
Replies: 30
Views: 1,920
My m42 lenses got a revival after I got a Sony A7. It is not a perfect camera but for use with old MF lenses it is nice IMO.

My main system is still Pentax K3II with AF lenses, but A7 feels like it was designed for old MF lenses.
+ Good focusing aid with large EVF in a compact form factor. It is almost like going back using an old manual focus film SLR.
+ No crop factor make most of the lenses more valuable to use for me.
+ No trouble with metering.

So now I will try to hunt down more of the early m42 Takumars from late 1950s, because I really like how many of them capture the scenes.
I just got hold of an Auto-Takumar 55/2 with no visible signs of usage, which is nice for a 60+ year old lens.

I miss sensor stabilisation on A7, but on the other hand it would make camera heavier, and with electronic shutter it is possible to use quite long shutter speed anyway.
Forum: Pentax SLR Lens Discussion 03-20-2019, 09:46 PM  
Best WR alternative to Sigma 17-50mm f/2.8?
Posted By Fogel70
Replies: 7
Views: 552
The DA* 16-50 is AW. Which mean even better weather sealing than WR.

Another alternative is DA 18-135, but it is little behind in IQ. But otherwise it is a really nice lens. Light and compact and the extended zoom range is nice in conditions where you might not want to switch lenses.
Forum: Troubleshooting and Beginner Help 03-14-2019, 12:49 AM  
Shutter Count Issue With Pentax K-50.
Posted By Fogel70
Replies: 9
Views: 586
Are you really sure of this?
Can you really see that every shutter actuation is followed by a countdown of the counter? I assume you use continuous shooting.
Or can it be that after every fourth shot or so, the counter did not count down by one?
Forum: Troubleshooting and Beginner Help 03-13-2019, 11:27 PM  
Shutter Count Issue With Pentax K-50.
Posted By Fogel70
Replies: 9
Views: 586
The counter is based on max image size for the quality used. So the counter show minimum amount of shots that can be captured.
Forum: Pentax SLR Lens Discussion 03-11-2019, 09:23 PM  
How can a 1 sensor look that good?
Posted By Fogel70
Replies: 26
Views: 1,770
An 1" sensor is quite large and the lens on RX100 have about the same speed advantage over 55-300 PLM as the the APS-C sensor has over 1" sensor.

So I would expect comparable images captured by K70 with 55-300 PLM as with RX10. But RX10 probably apply more processing on the jpgs than K70. It may be possible to adjust jpg settings in K70 to give a closer result to RX10.

The lens on RX10 may be of higher optical quality than 55-300, so any difference you may see is probably mostly down to difference in optical performance more than size of the sensor.
Forum: Pentax Camera and Field Accessories 02-11-2019, 07:33 AM  
Binoculars as part of wildlife photography kit
Posted By Fogel70
Replies: 30
Views: 1,951
I got myself a Pentax UP 8-16x21 ZOOM binocular, as I wanted the extra magnification in a compact and light binocular for my daily bag. But for 16x you need extra support.
It is not the perfect binocular, but for the price it is better than I expected. I believe I payed $70-80 for it.

If you only need 8x magnification you can probably find better binocular for the price.
Forum: General Photography 02-02-2019, 01:50 AM  
"Equivalence" between formats and lenses...
Posted By Fogel70
Replies: 627
Views: 11,870
Reading the last few comments made me realize I must stop using equivalence. From now on I will call it "Babel fish" instead. ;)
Forum: General Photography 02-01-2019, 10:34 AM  
"Equivalence" between formats and lenses...
Posted By Fogel70
Replies: 627
Views: 11,870
1. Yes, I have new used MFT. So need someone to explain how it works without using numbers. Because numbers is too complicated.
2. It is the amount of money I have on my account that I'm willing to spend on a camera and a couple of lenses.
Forum: General Photography 02-01-2019, 10:05 AM  
"Equivalence" between formats and lenses...
Posted By Fogel70
Replies: 627
Views: 11,870
I'm willing to spend an equivalent sum of 10-20k.





QuoteQuote:

It's - once again - pointless to make the beginners choose on criteria he doesn't understand. You just want to talk "equivalence" with him, but he can't follow.



Forum: General Photography 01-31-2019, 10:22 PM  
"Equivalence" between formats and lenses...
Posted By Fogel70
Replies: 627
Views: 11,870
But it also require you to explain what a normal lens is, as it may be an unknown concept for new users. Once you explained what a normal lens is, it does not matter much if using focal length or FOV to explain "normal"

When a new user see "normal lens" mentioned the first time they may think "I want all my lenses to be normal, not strange and weird lenses".

There are just so many thing we take for granted after using cameras for decades, that it may be difficult to realize that they may be difficult to understand the first time you face them.
Forum: General Photography 01-30-2019, 09:57 PM  
"Equivalence" between formats and lenses...
Posted By Fogel70
Replies: 627
Views: 11,870
If you want to do it, just apply the same rules as always and multiply/divide with crop factor diffetence between the systems used.

How do you calculate the difference in the distance between 5km and 5km? If they are both the same how come your friend and you may end up on different spots if you both walk 5km.
Forum: General Photography 01-30-2019, 01:28 AM  
"Equivalence" between formats and lenses...
Posted By Fogel70
Replies: 627
Views: 11,870
Yes of course, that is the next step if you not only want to copy the look from one image, but the whole style of an artist.
So you need to study many of the artists work, and research the artist.
But this probably belong in a separate thread, as it can be more complex (and probably open for more debate) than equivalency.

---------- Post added 30-01-19 at 09:30 ----------

I do not see any reason why this would change if primes did not exist.
Forum: General Photography 01-29-2019, 10:57 PM  
"Equivalence" between formats and lenses...
Posted By Fogel70
Replies: 627
Views: 11,870
What is wrong with copying? It is a well known process for learning.
We learn by copying - EntreGurus
Forum: General Photography 01-29-2019, 09:23 PM  
"Equivalence" between formats and lenses...
Posted By Fogel70
Replies: 627
Views: 11,870
Yes. I think this has been repeated several times in this thread. Once you are familiar with the systems you use, you do not have to think of which focal length to choose for the FOV you need, or which aperture gives you the DOF you need. It comes automatically as you have know the equivalence between them by heart.

But if you would borrow a Nikon 1 system from a friend and you had never used it before, you would need to spend some more time on figuring out what you need to use. But once you have it figured out, it does not take much.
Forum: General Photography 01-29-2019, 08:56 PM  
"Equivalence" between formats and lenses...
Posted By Fogel70
Replies: 627
Views: 11,870
Is this an illustration of how crop factor works?
Like the equivalence between FF and MFT.
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