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05-01-2013, 09:45 PM   #1
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Focal lenght comparison with Teleconverter

I wanted to see the difference between all of my lenses in terms of focal length. This is what I thought would best represent them all in one photo. The number stands for the focal length, eg: 14=14mm. The "t" after the focal length means it was taken with my Tamron 1.4 x AF TC (autofocus Teleconverter).
Lenses:

SMC Pentax DA 14mm f/2.8 (35mm eq. =21mm)
14mm w/ 1.4 TC =19.6 (35mm eq. =29.4)

SMC Pentax DA* 55mm f/1.4 (35mm eq. =82mm)
55mm w/ 1.4 TC =77 (35mm eq. =115.5)

SMC Pentax Da* 60-250mm f/4 (35mm eq. =90-375)
60mm w/ 1.4 TC = 84mm (35mm eq. =126mm)
250mm w/1.4 TC= 350 (35mm eq. = 525mm)




05-02-2013, 04:16 AM   #2
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this needs to be moved to the lens discussion forum, it does not belong here
05-02-2013, 06:41 AM   #3
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QuoteOriginally posted by Lowell Goudge Quote
this needs to be moved to the lens discussion forum, it does not belong here
How do I get it over there?
05-02-2013, 06:53 AM   #4
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ask a moderator to move it for you.

some times, actually many times they will see the post and move it but it never hurts to ask

in the pull down menu under forum there is a contact a moderator tab
I have never tried it myself

05-04-2013, 07:55 AM   #5
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There seems to be way too small difference between 14 and 14t frames.
05-06-2013, 10:24 PM   #6
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Do you think so? It's what matched up. I took each photo at a transparency to 50% and fit each photo into the previous. Matching up every feature. But I'm with you. I thought it would be less field of view
05-06-2013, 11:15 PM   #7
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The TC should give you the same amount of crop on all focal length, but 14mm with 1.4x TC seems to be less than 15mm, not 20mm it should be.
05-10-2013, 12:56 PM   #8
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Yeah let me try it a second time.

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