Author Topic: Sylvania 75mm f/2.5 (C-mount) ***** (Read 1801 times)

Nordentro · « **on:** September 14, 2010, 11:57:21 AM »

Testing my viewfinder

adash · « **Reply #1 on:** September 14, 2010, 09:26:43 PM »

75 to 85 seem to be your favorite focal lengths....this lens seems very good too.

Nordentro · « **Reply #2 on:** September 16, 2010, 01:11:14 PM »

Quote from: adash on September 14, 2010, 09:26:43 PM

75 to 85 seem to be your favorite focal lengths....this lens seems very good too.

yes indeed, I like those short telephoto lenses a lot

This one surprised me with good sharpness

mikmas101 · « **Reply #3 on:** September 16, 2010, 04:30:16 PM »

You excellent pics have convinced me - I have now a C mount adapter on it's way from the orient.....

adri · « **Reply #4 on:** September 16, 2010, 10:34:28 PM »

I agree. The piccys are great and I'm tempted to order a C Mount adapter too but having looked on fleabay it seems finding a lens like this might be more tricky.

Adri

adri · « **Reply #5 on:** September 17, 2010, 02:51:41 AM »

So are we right in saying this is equivalent to a 150mm on a 35mm camera?

Can't quite get my head round how this affects the choice of lenses for the E-P1. What's considered a wide angle lens on 35mm is a portrait lens on M4/3 etc?

I'd like to look into getting a good legacy lens for portraits but not until I have this conversion issue clear and the effects it has on photos...

Anyone?

TIA

Adri

adash · « **Reply #6 on:** September 17, 2010, 03:44:27 AM »

Quote

What's considered a wide angle lens on 35mm is a portrait lens on M4/3 etc?

Multiply the focal length twice and you will get the "35mm equivalent".

adri · « **Reply #7 on:** September 17, 2010, 03:57:29 AM »

Yes. But are there not side effects to doing that? I was aware of the simple side of multiplying by 2 but wondered if there were 'other' effects of using a lens designed for one format in a different format. Barrel Distortion, chromatic aberrations etc

Just wondering.

TIA

Adri

adash · « **Reply #8 on:** September 17, 2010, 05:28:18 AM »

It is possible to see more aberrations because the image is magnified more in order to show it on screen/paper than the full-frame is. Every result you get is lens-dependent. That's why we have the "lens sample" section.

Nordentro · « **Reply #9 on:** September 17, 2010, 03:39:53 PM »

Quote from: mikmas101 on September 16, 2010, 04:30:16 PM

You excellent pics have convinced me - I have now a C mount adapter on it's way from the orient.....

C mount is fun, some of them are so small, some of them have beautiful artistic bokeh (it's a matter of taste), some have natural vignetting out in the corners (makes a nice frame), some are really sharp (at least in the middle), some are heavy and supreme built

I guy stared at me for a long time here the other day when I walked around with one of my Soligors Elitars on my PEN. Suddenly he asked "that's not a new camera, is it?"

Sylvania 75mm f/2.5 (C-mount) *****