Can anybody recommend a 70-200 or 70-300 lens for a Pentax K20D? Should
be sharp enough for a 14MP APS-C sensor. Doesn't have to be F2.8,
because of weight & bulk & cost - an F4 lens would suffice, provided
it's sharp enough. I know that the Pentax 50-135 F2.8 is good, but would
prefer a longer lens.
--
Alfred Molon wrote:
> Can anybody recommend a 70-200 or 70-300 lens for a Pentax K20D?
> Should be sharp enough for a 14MP APS-C sensor. Doesn't have to be
> F2.8, because of weight & bulk & cost - an F4 lens would suffice,
> provided it's sharp enough. I know that the Pentax 50-135 F2.8 is
> good, but would prefer a longer lens.
Alfred,
If you had bought Nikon, there's a very well respected 70-300mm VR lens:
David J Taylor wrote:
> Alfred Molon wrote:
>> Can anybody recommend a 70-200 or 70-300 lens for a Pentax K20D?
>> Should be sharp enough for a 14MP APS-C sensor. Doesn't have to be
>> F2.8, because of weight & bulk & cost - an F4 lens would suffice,
>> provided it's sharp enough. I know that the Pentax 50-135 F2.8 is
>> good, but would prefer a longer lens.
>
> Alfred,
>
> If you had bought Nikon, there's a very well respected 70-300mm VR lens:
>
> http://www.europe-nikon.com/product/.../overview.html
>
> David
>
>
I haven't bought anything yet, but am not considering a Nikon for the
moment because they don't have a 14MP model and I don't want to change
the camera after a year or two just because the MP count has increased.
With a 14MP model I can skip one generation and upgrade when 16-18MP
cameras hit the market.
And please don't tell me I don't need the MP. Alamy is requesting
submissions with at least 16.7MP and 14MP is closer to that than 10 or
12MP.
--
Alfred Molon <alfred_molon@yahoo.com> wrote:
>In article <Cnn7k.13628$E41.273@text.news.virginmedia.com>, David J
>Taylor says...
>
>> If you had bought Nikon, there's a very well respected 70-300mm VR lens:
>>
>> http://www.europe-nikon.com/product/.../overview.html
>
>I haven't bought anything yet, but am not considering a Nikon for the
>moment because they don't have a 14MP model and I don't want to change
>the camera after a year or two just because the MP count has increased.
>With a 14MP model I can skip one generation and upgrade when 16-18MP
>cameras hit the market.
Why not go straight to a 25MP camera?
>And please don't tell me I don't need the MP. Alamy is requesting
>submissions with at least 16.7MP and 14MP is closer to that than 10 or
>12MP.
No, they ask for images of at least 17MB, not 17MP.
Alfred Molon <alfred_molon@yahoo.com> wrote:
> In article <Cnn7k.13628$E41.273@text.news.virginmedia.com>, David J
> Taylor says...
>
>> If you had bought Nikon, there's a very well respected 70-300mm VR lens:
>>
>> http://www.europe-nikon.com/product/.../overview.html
>
> I haven't bought anything yet, but am not considering a Nikon for the
> moment because they don't have a 14MP model and I don't want to change
> the camera after a year or two just because the MP count has increased.
> With a 14MP model I can skip one generation and upgrade when 16-18MP
> cameras hit the market.
> And please don't tell me I don't need the MP. Alamy is requesting
> submissions with at least 16.7MP and 14MP is closer to that than 10 or
> 12MP.
That seems odd, so I checked the Alamy web site. Under "preparing your
images" and "digital cameras" I found this:
"Use a pro-level camera with a true (non-interpolated) resolution of
at least 6 megapixels. This will give a file size of at least 17MB at
8 bit."
That 17MB refers to file size of something like a TIFF, not camera
MP. Elsewhere on their web site they explain that they expect you to
upsample your submissions to reach the high pixel density they require
on their standardised submissions, specifically recommending Genuine
Fractals as doing the best job.
They expect a 6MP pro camera with a good lens will be good enough.
Which was as I remembered from the last time I checked them out. A
Sony R1 such as you and I have is more than good enough for Alamy
submissions.
In article <485e1a85$0$17168$742ec2ed@news.sonic.net>, Ray Fischer
says...
> Alfred Molon <alfred_molon@yahoo.com> wrote:
> >In article <Cnn7k.13628$E41.273@text.news.virginmedia.com>, David J
> >Taylor says...
> >
> >> If you had bought Nikon, there's a very well respected 70-300mm VR lens:
> >>
> >> http://www.europe-nikon.com/product/.../overview.html
> >
> >I haven't bought anything yet, but am not considering a Nikon for the
> >moment because they don't have a 14MP model and I don't want to change
> >the camera after a year or two just because the MP count has increased.
> >With a 14MP model I can skip one generation and upgrade when 16-18MP
> >cameras hit the market.
>
> Why not go straight to a 25MP camera?
Not available yet, besides will likely be way above my budget.
> >And please don't tell me I don't need the MP. Alamy is requesting
> >submissions with at least 16.7MP and 14MP is closer to that than 10 or
> >12MP.
>
> No, they ask for images of at least 17MB, not 17MP.
>
> Big difference.
Nope. They ask for 48 MByte images, which translates into 16.7 MP.
--
John wrote:
> David J Taylor wrote:
>> Alfred Molon wrote:
>>> Can anybody recommend a 70-200 or 70-300 lens for a Pentax K20D?
>>> Should be sharp enough for a 14MP APS-C sensor. Doesn't have to be
>>> F2.8, because of weight & bulk & cost - an F4 lens would suffice,
>>> provided it's sharp enough. I know that the Pentax 50-135 F2.8 is
>>> good, but would prefer a longer lens.
>>
>> Alfred,
>>
>> If you had bought Nikon, there's a very well respected 70-300mm VR
>> lens:
>> http://www.europe-nikon.com/product/.../overview.html
>>
>> David
>>
>>
>
> Wow, that's a very helpful response.
>
> John.
It was intended to show there is more to choosing a camera than just the
MP count. You need to look at the complete system.
Alfred Molon wrote:
> In article <Cnn7k.13628$E41.273@text.news.virginmedia.com>, David J
> Taylor says...
>
>> If you had bought Nikon, there's a very well respected 70-300mm VR
>> lens:
>>
>>
>> http://www.europe-nikon.com/product/.../overview.html
>
> I haven't bought anything yet, but am not considering a Nikon for the
> moment because they don't have a 14MP model and I don't want to change
> the camera after a year or two just because the MP count has
> increased. With a 14MP model I can skip one generation and upgrade
> when 16-18MP cameras hit the market.
>
> And please don't tell me I don't need the MP. Alamy is requesting
> submissions with at least 16.7MP and 14MP is closer to that than 10 or
> 12MP.
More MP equals more noise. Are you really sure you want that?
Others have already mentioned that 6MP is enough to Alamy.
Thanks for your reply, but that still doesn't answer my question ahout
the 70-300 lens.
Sigma and Tamron have such lenses, but performance is less than stellar.
Sony seems to have a good 70-300 lens, which makes me wonder if I should
get a A350 instead.
--
70-200 or 70-300 for Pentax 
Linear Mode
