converter

So I recently bought an old lens for quite cheap at a thrift store (the specs on the sides say "Spiratone 1:5.6 f=300mm Mirror Lens No.8300968 ø72 Minitel-S Plura-Coat"), and it appears to be built for SLR cameras rather than my Canon Rebel. I've done some research and it appears that a t-ring...

Hello, i have a picture that i will send to a press to get printed, but the press want the picture to be in CMYK and 300dpi minimum. How do i convert this file/picture to cmyk and how do i check how many dpi it have? The picture is now in sRGB and 3072x3072 px.

Yes, I've been reading to many random posts about how C1 is so much better for converting ARW files. But I'd really rather do my editing in LR because, frankly, I don't want to learn a whole new system while I'm still getting used to my new (a6300) camera. So do I first bring my ARW photos...

Hi, I'm new and had a question about the Tamron Adapt-A-Matic line from the 70's. Since I was born in 1996 This lens is twice as old as me and I have no clue of what I got in my hands. I got a Canon 70D so I need a converter from Adapt a matic (the mount of the lens) to EF. Now I know that...

Selling my "not used as often", in mint condition Sigma 70-200mm OS (image stabilization) for $999 + Tele for $199. Here's my ad on NYC Craigslist. Would prefer to sell locally. But I am open to shipping via PayPal + 3%. Sigma 70-200mm f/2.8 EX DG APO OS HSM for Canon I am also selling the...