Go Back   Steve's Digicams Forums > Digicam Help > General Discussion

Reply
 
Thread Tools Search this Thread
Old Feb 21, 2010, 9:13 PM   #11
Senior Member
 
shoturtle's Avatar
 
Join Date: Dec 2009
Location: Frankfurt AM
Posts: 11,348
Default

if you want a megazoom that starts at 28 look at the tamron 18-270mm it is a very good megazoom lens. And have the near angle you desire. It has won awards in Europe.

http://www.tamron.com/lenses/prod/18270_vc.asp
__________________
Super Frequent Flyer, no joke. Ex Patriot and loving it.
Canon Eos 60D, T1i/500D, Eos1, Eos 630, Olympus EPL-1, and a part time Pentax K-X shooter.

Last edited by shoturtle; Feb 21, 2010 at 9:18 PM.
shoturtle is offline   Reply With Quote
Old Feb 21, 2010, 9:27 PM   #12
Senior Member
 
shoturtle's Avatar
 
Join Date: Dec 2009
Location: Frankfurt AM
Posts: 11,348
Default

Or if you get pentax slr, look at the 18-250mm from tamron also.
__________________
Super Frequent Flyer, no joke. Ex Patriot and loving it.
Canon Eos 60D, T1i/500D, Eos1, Eos 630, Olympus EPL-1, and a part time Pentax K-X shooter.
shoturtle is offline   Reply With Quote
Old Feb 21, 2010, 10:07 PM   #13
Member
 
Join Date: Feb 2010
Posts: 87
Default

Thanks! Looking in B&H I found these:

http://www.bhphotovideo.com/c/produc...specifications

http://www.bhphotovideo.com/c/produc...6_3_Di_II.html

It seems that the 18-250 is not available to Pentax. (I didnt decide about the camera yet - but the good references about low light, the live preview and video abilities makes the Pentax K-X the winner at this moment)
MarceloRSC is offline   Reply With Quote
Old Feb 21, 2010, 10:08 PM   #14
Member
 
Join Date: Feb 2010
Posts: 87
Default

BY THE WAY, if the Pentax K-X has a slightly larger sensor than other APS-C (this is why its better in low light), is there the risk that using a generic Pentax lens (not from Pentax) I have some some dark border or dark corners?

(some vignetting is expected, specially in long zoom lenses, but may it be too accented or reach to block parts of the sensor?)

EDITED: I found in Tamron site a doc mentioning the maximum size of sensor. It says that the lens is to sensors until 24x16mm - the Pentax K-X is 23.6 x 15.88mm - close, but fits. Of course I can imagine that the vignetting may be stronger than in a smaller sensor.


http://www.tamron.com/lenses/assets/...uick_guide.pdf

Last edited by MarceloRSC; Feb 21, 2010 at 10:20 PM.
MarceloRSC is offline   Reply With Quote
Old Feb 21, 2010, 10:11 PM   #15
Senior Member
 
shoturtle's Avatar
 
Join Date: Dec 2009
Location: Frankfurt AM
Posts: 11,348
Default

Pentax, nikon and sony has a slightly larger sensor then the canon. That is why the crop factor is 1.5 for pentax, nikon and sony and 1.6 for canon.

There is no risk of the tamron or sigma lenses on the camera they are design for.
__________________
Super Frequent Flyer, no joke. Ex Patriot and loving it.
Canon Eos 60D, T1i/500D, Eos1, Eos 630, Olympus EPL-1, and a part time Pentax K-X shooter.
shoturtle is offline   Reply With Quote
Old Feb 21, 2010, 10:11 PM   #16
Senior Member
 
TCav's Avatar
 
Join Date: Sep 2005
Location: Washington, DC, Metro Area, Maryland
Posts: 13,572
Default

No. Actually. Pentax' APS-C sensor isn't slightly larger; Canon's is slightly smaller.

Pentax, Sony, and Nikon all have APS-C image sensors that are about 24mm x 18mm. Canon's are about 22mm x 15mm.
__________________
  • The lens is the thing.
  • 'Full Frame' is the new 'Medium Format'.
  • "One good test is worth a thousand expert opinions." - Tex Johnston, Boeing 707 test pilot.
TCav is offline   Reply With Quote
Old Feb 21, 2010, 10:14 PM   #17
Senior Member
 
shoturtle's Avatar
 
Join Date: Dec 2009
Location: Frankfurt AM
Posts: 11,348
Default

Actually I think tamron make some of the pentax lenses.
__________________
Super Frequent Flyer, no joke. Ex Patriot and loving it.
Canon Eos 60D, T1i/500D, Eos1, Eos 630, Olympus EPL-1, and a part time Pentax K-X shooter.
shoturtle is offline   Reply With Quote
Old Feb 21, 2010, 10:16 PM   #18
Senior Member
 
TCav's Avatar
 
Join Date: Sep 2005
Location: Washington, DC, Metro Area, Maryland
Posts: 13,572
Default

BTW, the superzoom lenses (18-200, 18-250, etc) aren't actually very good. You'll get better image quality from multiple lenses of less ambitious zoom ranges, and you may even save some money too.
__________________
  • The lens is the thing.
  • 'Full Frame' is the new 'Medium Format'.
  • "One good test is worth a thousand expert opinions." - Tex Johnston, Boeing 707 test pilot.
TCav is offline   Reply With Quote
Old Feb 21, 2010, 10:23 PM   #19
Senior Member
 
shoturtle's Avatar
 
Join Date: Dec 2009
Location: Frankfurt AM
Posts: 11,348
Default

It may not be as good as a 2 lens solution, but it is respectable in imagine quality. It comes down to what is more of a priority. The one lens solution has it's appeal for the lighter packing, and less fuss factor. For some the little less imagine IQ is worth it. And come off a bridge camera, that degradation would not be that apparent.

The Pentax 2 lens kit with the 18-55 and 55-300 is actually very good. It would cover allot of the needs of most shooters. But if you do not want to be switching lens. The tamron 18-250mm on the pentax is quite good form what I have read.

And for the canon the 18-270mm is very good if I ever wanted a 1 lens solution.
__________________
Super Frequent Flyer, no joke. Ex Patriot and loving it.
Canon Eos 60D, T1i/500D, Eos1, Eos 630, Olympus EPL-1, and a part time Pentax K-X shooter.
shoturtle is offline   Reply With Quote
Old Feb 21, 2010, 10:34 PM   #20
Member
 
Join Date: Feb 2010
Posts: 87
Default

An intersting link related to this topic:

http://www.tamron.com/lenses/learnin...comparison.php
MarceloRSC is offline   Reply With Quote
 
Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off



All times are GMT -5. The time now is 7:00 AM.