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What is a Full Frame Lens and a D Lens; Newbie question
Topic Started: Mar 19 2008, 04:01 PM (700 Views)
tvanand
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Alpha Elite Member
Hi,

I have a question on the Lenses.

What does it mean by a Full Frame lens and D Lens Compatible. Does both of this has any relationship.

Does this mean that all the lenses that were used during the Film Camera periods (Auto Focus Lenses) are Full Frame Lenses.

I am a bit confused with these. I have a 17-35 KM F2.8 - 4 D lens and 28-135 Minolta F4-4.5 lens, but 17-35 is a Full Frame Lens, but how about 28-135?

Please delete this thread if someone has already asked this question.

regards
Anand
An eye for eye only ends up making the whole world blind - Mahatma Gandhi
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Sony A700
KM 17-35 mm F2.8-4,Minolta 28-135 mm F4-4.5, Minolta 50 mm f1.7,Sony 70-300 G F4.5-5.6, Sony HVL-F42
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Galdor
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I'm just a Newbie Cameraman
Hi bro, full frame lens means that the lenses can be used on a 35mm Minolta/Konica Minolta AF film camera and the future Sony FF DSLRs. Lenses which are meant for the APS-C sized sensors will be labelled as a DT lens and such lenses cannot be used on a film or Full Frame camera. Hope this helps.
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tvanand
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Hi Bro,

thanks for the information.

the reason i asked the question on the 28-135 mm is i have heard people talking about 17-35 as a Full Frame, but 28-135, i have not heard. Thats why this question came into my mind.


An eye for eye only ends up making the whole world blind - Mahatma Gandhi
-------------------------------------------------------------------------------------------------------------
Sony A700
KM 17-35 mm F2.8-4,Minolta 28-135 mm F4-4.5, Minolta 50 mm f1.7,Sony 70-300 G F4.5-5.6, Sony HVL-F42
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Galdor
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I'm just a Newbie Cameraman
The 28-135mm is a old lens. This lens can produce sharp and pictures. The colours the lens can produce is very nice too. How much were you quoted for this lens?
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foxcorn
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tvanand
Mar 19 2008, 04:19 PM
Hi Bro,

thanks for the information.

the reason i asked the question on the 28-135 mm is i have heard people talking about 17-35 as a Full Frame, but 28-135, i have not heard. Thats why this question came into my mind.

Your Minolta 28-135mm is full frame lens. For Minolta & Sony, those APS-C only (small sensor) lenses are marked with DT (digital). This should not confused with D lenses where D stands for distance, lens communicate distance information with camera when use with TTL flash.


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Birder
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Alpha Master Jedi Mita Memori-san ’¹‚Ì’j clkoh

Lenses can be FF (for full frame) or DT (for APS-C).

D lenses can be identified with the 8 contacts on the mount, non-D 5 contacts.

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from http://www.dyxum.com/lenses/lens_glossary.asp

D – Minolta; Sony, other lens manufacturer
D-Series lenses include distance-encoding device which enables improved calculation for flash exposure when used on cameras with ADI (Advanced Distance Integration) support. We know that even old lenses do provide subject distance info, but D lenses are very likely to do this more precisely.
As far we know ADI support is found on most modern AF lenses for Minolta a mount and you can recognize them by 8 lens contacts on the mount ( while older lenses have only 5 contacts). Whether or not ADI is bringing any significant improvement to flash exposure is debatable and users opinion are different.
A very common misunderstanding is that D mark means "Digital" which is absolutely wrong. D series lenses are in no way optimised better for digital cameras than non D lenses.

DT – Minolta; Sony
DT stands for "digital technology" and is supposed to describe lenses particularly optimized for digital cameras. In practice there is only one important thing about DT lenses you should be aware of; unlike non DT lenses these are covering image circle smaller than conventional 35mm lenses and are made with APS-C sized sensors. While you can mount these lenses on FF (film) cameras you will get severe vignetting due to reduced image circle. It is worth saying that DT lenses are in no aspects better than newer full frame lenses (like KM 17-35/2.8-4 of or 28-75/2.8) when image quality is concerned and it's more a marketing buzz than anything else.

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yannh
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Very good explanation clkoh, I learn something new again today. :D
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