Got my Sigma 15mm, Question!!

[sdctlc 0]

OK, those that are using it, are you using the adaptor ring on the front with a filter? It comes off and leaves the lens more exposed but since I am shooting a XT I am not seeing the full 180 fish look with the sensor conversion factor so it does not seem to matter if it is on or not (which I expected). Any way are you leaving it on with a filter, which I am thinking about doing to protect the front glass??

I want to go shoot tomorrow but dont want to hurt the glass. Let me know what your doing or what you know people are doing.

Scott C.

"He who Hesitates Shall Inherit the Earth!"

[vdschoor 0]

Scott,

The Sigma 15mm does not take filters.
I agree it's kind of icky exposing the glass to the elements, but that's the only way it's going to work.

Iwan

[genoyamamoto 0]

doesn't it take gelatin filters on the rear element? I can't remember haven't looked at my sigma 15mm in a while. Oh and I thought that adaptor thing was just so you could put the lens cap on it and that it is not a filter holder.

Gotta go... plaything needs to spank me
Feel the hate...
Photos here

[videointhesky 0]

Hey Scott

Here is what your photo will look like if you leave the
adaptor ring with out an filiter on the Sigma 15mm lens.

You can always crop the vinetting out of your photos.

Also in Photoshop CS2 I recall some tools to fix the Fish Eye Effect & the Vinetting Effect


www.freefall-video.com

[Zee 0]

Quote

doesn't it take gelatin filters on the rear element? I can't remember haven't looked at my sigma 15mm in a while. Oh and I thought that adaptor thing was just so you could put the lens cap on it and that it is not a filter holder.

Yep - there's a little clip that comes with the lens used for attaching gelatin filters.

Peace,
Z

Action©Sports

[sdctlc 0]

I see the gelatin filter holder but am not sure about using it, I dont know of anybody who does, Does anybody use it..

I dont see the vinetting (more realistically the adaptor being caught in the corners of the sensor) but I do see the filter on teh adaptor when I take a shot with a front filter on. No real reason to leave it on if I dont want it other then to protect the glass. I dont think it is a big deal if i am carefull on the glass and it seems that people are doing that if they are jumping this lens... I have received a couple of responses from people that are jumping w/o a front lens filter/protector..

Scott C.

"He who Hesitates Shall Inherit the Earth!"

[Zee 0]

Nah, I'd leave the ring off if I were you. I've been using my Sigma 15mm for probably 4 years now and and I don't have a single scratch on it - It just appears to be a really durable piece of glass cuz I know I've boinked it on all kinds of stuff .

As far as the filter goes - I've used a Neutral Density filter once just because someone gave me a few to try but I wasn't very impressed. I think it does an excellent job without any filters.....

You really shouldn't get any vinetting on a digital SLR with that thing either - should be comparable to a 24mm on a standard SLR - I use it all the time on a regular SLR shooting slide film - the only time I get vinetting is when I use it with a flash (like the attached pic) and that's just because the flash doesn't cover the same field of view.

Peace,
Z

Action©Sports