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Lens and manual on Omega C700 enlarger

Debejyo Chakraborty , Jul 13, 2010; 09:33 p.m.

Hi,
This is a distress call. I have a C700 enlarger. It came with a 50mm lens. It works fine up to 35mm films. However, I use only 6x6. The 50mm lens is obviously not good enough.
I got a 135mm lens, which was too long. In fact, I could not even focus on the baseboard. I then bought a 105mm lens. Apparently it is fine for 6x7 negatives and my enlarger is for 6x7, so I thought this should be good. The maximum enlargement I could manage was about 9x9" on the baseboard. It does not even cover a 8x10 paper. This is with the focus head at the highest point and the focusing bellow maximum stretched.
Can someone tell me which focal length will give me a perfectly flat focus on my baseboard up to 11x14" print on this enlarger from a 6x7 negative?
Can someone give me a manual for this enlarger? I had a photo store guy telling me that there should be some kind of adjustment on the enlarger which should say 35mm, 6x6, etc and I'm supposed to put the lever at the correct setting. The sad part is, I have not yet located any lever of any kind.
Any help is appreciated. Its about 110 deg now in Tempe, AZ and I'm not able to think coolly any more or make trips to photo stores :)
Thanks a lot guys,
Debejyo
PS:
Some members might feel these are too elementary to post on a forum. Please accept my apologies. Sometimes even stupid discussions can give smart outcomes!

Responses

Martin Dake , Jul 13, 2010; 09:49 p.m.

An 80mm lens will cover 6x6 just fine and most will also do 6x7 although a 90mm is the standard for 6x7.
I use a Nikon 80mm and it covers my 6x7 negs.
Do you have the condensor or dichroic color head?

Send me your email address and I will send you a copy of the manual; click on my name and I think you can send me an email from there.

Debejyo Chakraborty , Jul 13, 2010; 10:06 p.m.

Hi Martin,
It is for B/W prints only. So, I have a condensor. Thanks for your help. Also, will a 75mm lens do the job? Looks like they are cheaper to buy on ebay! My email is debejyo at yahoo.com. Anyway, I'm sending you an email next.
Thanks,
Debejyo

Martin Dake , Jul 13, 2010; 11:24 p.m.

A 75mm will do 6x6 but probably not 6x7.
Spend a little bit extra and get a 80mm Nikon, Rodenstock or Schnieder.

Debejyo Chakraborty , Jul 14, 2010; 12:10 a.m.

Thanks Martin. All my answers are there in the manual.
As a service to fellow sufferers, please feel free to download the C700 manual from this link
Oh, I also discovered that the lens board does not come off on this enlarger (contrary to common belief). The only way to exchange lenses is by screwing them on and off.
As a thumbrule for magnification from what I learned from the manual for 6x6 negatives:
75mm and 80mm lens gives larger than 11x14"
90mm lens gives larger than 8x10"
105mm gives 9.45x9.45"
Good luck.

Lex Jenkins , Jul 14, 2010; 12:16 a.m.

If I'm recalling correctly - this was years ago - I think Ctein tested the EL-Nikkor N and Schneider 80mm lenses and found the Schneider would cover 6x7. My enlarger only handles up to 6x6 so the EL-Nikkor N 80/5.6 works fine for me. You can double check with him via his own website (I think he still offers a free sample chapter from his book) or via Mike Johnston's blog.

Debejyo Chakraborty , Jul 14, 2010; 03:02 a.m.

That is good info. Currently I just have 6x6 negatives to deal with. So, I'll not bother Mike right now. I'll go ahead and look for a 80mm.
Thanks Lex, for the heads-up though.

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