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Forum: Pentax SLR Lens Discussion
03-20-2016, 01:13 AM
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Well honestly for most case having more pixels isn't that useful whatever the lens. Oh most lenses get better resolution with more pixels, at least at their best apperture. And I think none would outresolve the sensor at f/4 on corners anyway.
But I mean with just 24MP you can print 30x40" print at 100 dpi and except if people start at it wanting to see issues with the print it will look fantastic... As long as your technique was great and you closed down enough for the lens to be sharp.
Yeah 36MP give you 133dpi instead of 100 and 51MP give you 150dpi at that resolution, nice...
As a consumer you can only buy what exist but if you were to settle say on 36MP K-1, because it is the only FF available and maybe you are quite interrested in the other features, like improved AF... That doesn't mean you need lenses that match 36MP resolution on corners at f/1.4
First there no lens that would do it, second, if you going to print 30x40 or smaller, and use an apperture were the lens isn't too bad, it is going to be great anyway...
This is just that it is not really worth to buy more to get more pixels, not anymore.
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Forum: Pentax SLR Lens Discussion
03-20-2016, 12:24 AM
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That's right, the question could be why insisting on taking that shoot or on that practice as "necessary".
As well as the car analogy, do you need to go on serious 4WD tracks and cross rivers all the time ?
And I mean I checked the thing when I decided to go to Iceland for a dozen days. We could rant a nice 4WD or a tourism car. Then the guides explained that to do it and be safe, you had to have at least 2 groups with at least 2 cars, really know your stuff and so on... Otherwise you could very well endup in the car, being taken by the river heavy flow and found dead month later.
The thing is we rented a normal car, we stayed on normal roads and when we decided to go on the glacier, we paid for somebody to drive us. Their vehicule had wheels the more than 1.5meters high. I mean would we have rented (or brough by boat for that matter from europe) a classical 4WD this would not have fitted anyway.
If you like macro there tamron 90 for you or any lens with an apperture ring with extensions rings added. This is still cheap.
If you really want wildlife, yes you might need expensive gear... And well even, I understood that's a compromize between the key wildlife shooter capacity to be more near your subject to get better shoots and having better gear that significantly more expensive.
I am going to Tanzania (rather than Kenya after all), we settled for this september in the end, and I decided to go for a 55-300. I have seen picture from some forum members... The 55-300 does quite a decent job. For a one time event. The 55-300 is good enough. Yeah I could have decided for a 150-500 or whatever but then I'd have to be sure I use it for several outings a years, otherwise it make no sense.
There is great gear, it does help but it make sense only if you really plan to use it.
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Forum: Pentax SLR Lens Discussion
03-19-2016, 02:55 AM
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This is not about ignorance for me or people not foccusing right for the main aspect.
This is about what information is available. if you are in the market lens or are just curious, what will you find about a lens? It's price, price comparisons, short user review in shops (like Amazon) and review from specialized sites.
While price say nothing of the performance but only assumption that more expensive is better and short user review are very subjective and tend to polarize on this is terrible or fantastic. The reviews website on the contrary have the appearance of respectability and reliability. There dedicated websites, there a huge library of lenses reviewed, there charts and measurement and also very importantly there the reviewers/expert conclusion.
The expert, and I insist on that word because the reviewer look like expert for most people, like it or not speak mostly of sharpness or the lack of it. They also speak of appertures and the importance of wide apperture. So if you read expert opinion on lenses what matter is large apperture and sharpness results.
The same for Cars, if you look at car reviews, what count is the power, the time to get up to 100km/h (or whatever depending of your unit), the sensation of speed/acceleration, the noise made by the motor and how well the car take curves at high speed.
So the OP is like a normal guy that say but look anyway you typical use of your car is not for racing, but driving on public roads with speed limit, law enforment, traffic jam and so on. The real factor for a car are comfort because you'll have to spend time in it, low energy consumption and low buying price because this is a cost and reliability because it is really not fun when you need it and it doesn't work anymore. And of course he would be mostly right.
Now on Pentax forum we are almost all enthousiast people that all own a powerful camera that can do 10 time more than most need. The primary criteria for a camera for most people is to be always available yet that you don't have to think of it even one second. The solution to this are Smartphones. For people needing quality you could have a point for say a m4/3 with a dual kit lens (transtandard + tele). I could even go as far as dual f/2.8 screwdrive kit from tamron and a K3 for 1500$. You really don't even need more than that. The difference for picture quality isn't really going to show.
This is not what we like here. People here rave about pixel shift, they rave after 36MP FF, We speak of expensive lenses on how important it is to have pro grade camera and pro grade lenses. How the 2000$ 70-200 or 150-450 justify their price. How it is quite logical for theses to be bulky and heavy. This is exactly like people that explain for car how important it is to have a v8 and have sub 5 second 0-100km/h rating.
At that point, yeah corner sharpness at f/1.4 look like a quite logical subject. If you don't like it, you should go more to an artistic photo website were people discuss photos, not gear. Likely the site name would not have a brand manufacturer name in it.
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