[wed7]

Which has better AF for weddings? 55 or 77?

I know the sigma 85 has faster AF. 😃

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Last edited by wed7; 01-01-2015 at 12:36 AM.

[Trudger1272]

Which has better AF for weddings? 55 or 77?

From what I understand the DA* 55 is supposed to be quiet and focus pretty fast. The 77 is definitely not quiet.

[drypenn]

I don't have any experience in professionally doing weddings, but wouldnt a zoom like 60-250 be better?

[zzeitg]

I don't have any experience in professionally doing weddings, but wouldnt a zoom like 60-250 be better?

I'd probably take 50-135 instead, as it's not so big and heavy.

[hjoseph7]

For indoor wedding shots I would say the 55mm. For outdoor wedding shots I would say the 77mm.

[Rondec]

Which has better AF for weddings? 55 or 77?

I know the sigma 85 has faster AF. 😃

I think they are about the same with regard to speed -- both are decent for portraits, but you wouldn't want to do a bunch of tracking shots with either. The 55 is basically inaudible, while the 77 is typical screw drive sound. Biggest thing to me, with lenses like the 77 and 85 is that you need to have a lot more space for working distance. As long as you have that, you'll be fine, but the 55 is better in that regard.

[nicoprod]

For weddings portraiture your longest lens is your first choice, because you have better control of background blur. If you don't have the room, you go down in length. I shoot 85 or 50-135, 55 if I need to be closer, 31 if I'm really limited by space.

[Digitalis]

A further assessment is still more troubling. It seems that many camera makers are raising the ISO sensitivity when the lens opening is at its widest, probably to cover up the lack of efficiency. “We have ascertained,” explained Guichard, “that on many cameras, the ISO is pushed up on the order of 1/3 to 1/2 stop when the lens opening comes close to its upper limit."

The isos are bumped without saying or registering in exif to show a beautifull 1EV difference between f/2 and f/1.4.

From what I have seen Pentax cameras do not do this - for example the SMP-K 50mm f/1.2 ( which is a fully manual lens and therefore the camera body has absolutely no Idea of what aperture is being used) correct exposure is able to be obtained and verified with an external meter at f/1.2, therefore the lens is transmitting the correct amount of light - and the sensor is not boosting anything. If you take an image with the FA77 at f/1.8 at the "A" setting and set the aperture ring to f/1.8 and take another image, there will be no difference in exposure between the two images

. On a Canon DSLR, using a manual Takumar 50mm f/1.4 and switching to a EF 50mm f/1.4 - both lenses when used at f/1.4 will give different exposures for an identical subject - that is because the Canon DSLR is fudging the ISOs - that trick only works when the camera body can communicate with the lens.

It apply to all camera manufacturer and is not pretty

Some manufacturers are worse than others, Fuji with their X -trans sensors falsified ISO ratings spring to mind.

Digital sensor don't fully leverage f/1.4 or f/1.2, even more so APSC sensors due to the angle of incidences of the light rays

Again, this is based on incorrect assumptions - the APS-C sensor is making the best use of the lenses image circle by only using the center "sweet spot" of the lens where the acute incident rays are less likely to be a problem. On FX format acute incident rays are much more problematic due to the increased image circle requirements.


Pentax K5IIs-SMCP-K 50mm f/1.2 @ f/1.2

[Edgar_in_Indy]

Very good information Digitalis; thanks for weighing in.